Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 48, Issue 13, 21 June 2012
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Volume 48, Issue 13
21 June 2012
In Brief
- Source: Electronics Letters, Volume 48, Issue 13, page: 740 –740
- DOI: 10.1049/el.2012.2023
- Type: Article
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- Author(s): Michael Kelly
- Source: Electronics Letters, Volume 48, Issue 13, page: 740 –740
- DOI: 10.1049/el.2012.2022
- Type: Article
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Prof. Michael Kelly from Cambridge University in the UK talks about the research behind his Letter ‘Highly reproducible tunnel currents in MBE-grown semiconductor multilayers’ on page 792. - Author(s): J. Baldwin
- Source: Electronics Letters, Volume 48, Issue 13, page: 741 –741
- DOI: 10.1049/el.2012.2017
- Type: Article
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Researchers at Hewlett Packard Laboratories in California have developed a low power technique for reading memristor crossbar arrays. Their method drastically reduces power consumption and can sense a single memristor state without disturbing adjacent elements.The memristor is the fourth class of two-terminal passive circuit element after the resistor, the capacitor and the inductor. It was proposed by Leon Chua in 1971, but a practical solid-state realisation did not appear until 2008 when a team at Hewlett Packard developed a switching memristor based on titanium dioxide thin films. Since then, research into memristor technology has increased as new challenges have presented themselves, including the control of power leakage and consumption. - Author(s): H. Dyball
- Source: Electronics Letters, Volume 48, Issue 13, page: 742 –742
- DOI: 10.1049/el.2012.2018
- Type: Article
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NTT researchers in> Japan have demonstrated 25 Gbit/s transmission over 40 km without the need for power-hungry optical preamplifiers. The team designed an avalanche photodiode receiver optical subassembly module (APD-ROSA) that allowed them to smash the previous best transmission performances of 10 Gbit/s using APDs.“The power consumption of semiconductor optical amplifiers will be a big issue for small transceivers in the near future,” said Masahiro Nada from NTT Photonics Laboratories. “Our APD-ROSA has the potential to realise low-power-consumption and low-cost, middle-reach 100 or 400 Gbit/s Ethernet systems. I believe that our results will open the door to using APDs for 100 Gbit/s systems.”
Interview
Alternative reading
Going the distance
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- Author(s): Hongming Zhou
- Source: Electronics Letters, Volume 48, Issue 13, p. 745 –746
- DOI: 10.1049/el.2012.0098
- Type: Article
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A method using creeping wave for sizing a single cylindrical defect has been developed, which can relate the time of flight between the satellite pulse and the reflected pulse to the dimensions of a defect, and the three-dimensional defect reconstruction problem is simplified to a series of cross-sectional reconstructions.
Using creeping wave to size cylindrical defect
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- Author(s): Qingshan Yang ; Yunhua Zhang ; Xiangkun Zhang
- Source: Electronics Letters, Volume 48, Issue 13, p. 746 –747
- DOI: 10.1049/el.2012.0780
- Type: Article
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A novel composite right/left-handed (CRLH) transmission line cell (TLC) based on a substrate integrated waveguide is proposed, which can be used for a leaky wave antenna for achieving large beam scanning-range/bandwidth ratio. Compared with previous CRLH TLCs, the proposed one has a narrower fast wave region where the propagation constant β changes from −k0 to +k0. An X-band leaky wave antenna (LWA) has been designed and fabricated and measurements are presented. Both simulated and experimental results show that the developed LWA has a narrow fractional bandwidth of 26% (from 8.3 to 10.8 GHz) while having a continuous wide beam scanning range of −65° to +54°. - Author(s): Y.T. Wan ; F.S. Zhang ; D. Yu ; F.C. Ren
- Source: Electronics Letters, Volume 48, Issue 13, p. 747 –749
- DOI: 10.1049/el.2012.0800
- Type: Article
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A single-feed microstrip patch antenna with a shorting metallic cylinder that can be operated at two distinct resonant modes is proposed. The two resonant modes can radiate a monopole-like pattern with vertical polarisation and a broadside pattern with circular polarisation, respectively. In addition, the effects of the metallic cylinder size on the frequency ratio of the two operating frequency bands are studied. Measured results support the simulation analyses. - Author(s): H.-W. Son ; H.-G. Jeon ; J.-H. Cho
- Source: Electronics Letters, Volume 48, Issue 13, p. 749 –750
- DOI: 10.1049/el.2012.1030
- Type: Article
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A low-cost, wideband, flexible antenna for radio frequency identification tags mountable on curved metal surfaces is presented. The antenna consists of a label-type patch adhering to a flexible polyvinyl chloride substrate. A novel balanced feed method using two orthogonal slits on the patch is proposed to perform simple and wideband impedance matching between the antenna and a tag chip. A prototype antenna was fabricated and tested with a commercial tag chip. It has a 3 dB return loss bandwidth of 70 MHz and a uniform read range of over 9.7 m in the 902–928 MHz range when it is mounted on a cylindrical metal plate with a radius of curvature of 150 mm.
X-band composite right/left-handed leaky wave antenna with large beam scanning-range/bandwidth ratio
Dual-band dual-polarised square patch antennas using shorting metallic cylinder
Flexible wideband UHF RFID tag antenna for curved metal surfaces
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- Author(s): Q.X. Nguyen and S. Jo
- Source: Electronics Letters, Volume 48, Issue 13, p. 750 –752
- DOI: 10.1049/el.2012.1530
- Type: Article
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Presented is a wheelchair control using a head pose free eye-gaze estimation. The direction of the wheelchair is computed from a user's eye-gaze pointing. The eye-gaze estimation system includes a 3D orientation sensor to take into account the head pose. Therefore, the user can change his or her pose with comfort during navigation. In experiments, its performance was evaluated in comparison with a manual keyboard control. - Author(s): T.J. Freeborn ; B. Maundy ; A.S. Elwakil
- Source: Electronics Letters, Volume 48, Issue 13, p. 752 –754
- DOI: 10.1049/el.2012.0360
- Type: Article
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A method of nonlinear least squares to estimate the Cole-Cole impedance parameters (Ro, R∞, α, C) from collected time-domain step response datasets is reported. Experimentally estimated parameters from fruit tissue step responses are given and compared with numerical simulations of the acquired model.
Electric wheelchair control using head pose free eye-gaze tracker
Least squares estimation technique of Cole-Cole parameters from step response
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- Author(s): W. Yu and G.C. Temes
- Source: Electronics Letters, Volume 48, Issue 13, p. 754 –755
- DOI: 10.1049/el.2012.0704
- Type: Article
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A new digital nonlinearity calibration and correction technique is proposed for multi-bit DACs in ΔΣ and incremental modulators. By finding the differences between capacitance errors using the ΔΣ modulator, the integral nonlinearity of the DAC can be found, and corrected digitally. - Author(s): G. Avitabile ; D. Cascella ; F. Cannone ; G. Coviello
- Source: Electronics Letters, Volume 48, Issue 13, p. 755 –757
- DOI: 10.1049/el.2012.1043
- Type: Article
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A novel input buffer for very high speed and high resolution track-and-hold amplifiers has been developed in BiCMOS technology. The configuration retains the benefits of a cascode configuration in terms of distortion and adaptability to various advanced switched-emitter (source)-follower based architectures while maintaining supply requirements similar to a conventional degenerated common emitter amplifier. To demonstrate the advantages of the presented architecture a distortion analysis has been carried out. The closed form formulas show very good agreement with Spectre® simulations using complete models. - Author(s): M.S. Qureshi ; W. Yi ; G. Medeiros-Ribeiro ; R.S. Williams
- Source: Electronics Letters, Volume 48, Issue 13, p. 757 –758
- DOI: 10.1049/el.2012.1017
- Type: Article
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An alternate approach for sensing resistive memory based on a memristor is introduced. An AC input is used with the frequency domain response of a first-order filter formed by a memristor and a capacitor. This technique saves power by cutting down the DC current significantly and minimising the DC leakage current in a crossbar array of resistive memory bits. - Author(s): H.F. Ugurdag ; F. Temizkan ; O. Baskirt ; B. Yuce
- Source: Electronics Letters, Volume 48, Issue 13, p. 759 –760
- DOI: 10.1049/el.2012.0307
- Type: Article
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A regular (one-pick) round-robin arbiter circuit picks one active requester (if any) out of n requesters. A two-pick round-robin arbiter selects up to two requesters. An n2n two-pick round-robin arbiter indicates the picked requests with (at most) two-hot n-bit output. A round-robin arbiter is fair to its requesters and does this by repeatedly moving its highest priority pointer to the position immediately next to the second requester picked. Presented is the circuit architecture and VLSI implementation of a new scalable two-pick round-robin arbiter with low latency, which is compared with previous work based on logic synthesis results. - Author(s): Yanjun Shi ; Bangyin Liu ; Shanxu Duan
- Source: Electronics Letters, Volume 48, Issue 13, p. 760 –762
- DOI: 10.1049/el.2012.0162
- Type: Article
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A simple solution for TRIAC dimmable LED drivers free of using large passive input filters, DC bus capacitors or bleeding resistors is proposed. Under the proposed method, the LED driver is constantly shorted at the input when the TRIAC is off and automatically turned to the switching state, and regains large input impedance right after the TRIAC is turned on. Experimental results showing the working waveform of the LED driver under dim are reported.
Digital DAC calibration technique for ΔΣ and incremental modulators
Low distortion input buffer for high resolution GS/s rate track-and-hold amplifiers
AC sense technique for memristor crossbar
Fast two-pick n2n round-robin arbiter circuit
Simple TRIAC dimmable LED driving solution free of large passive input filter, DC bus capacitor or bleeding resistor
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- Author(s): X.Z. Xie and J.T. Wu
- Source: Electronics Letters, Volume 48, Issue 13, p. 762 –764
- DOI: 10.1049/el.2012.1278
- Type: Article
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A novel non-local active contour model for fast texture segmentation is proposed. Two factors, redundancy description of texture features and smoothness of evolution contours, are investigated. Correspondingly, a new energy functional is introduced to adaptively handle the texture regions at different scales. A convex multistage method is adopted to solve corresponding minimisation problems. Experimental results show that the proposed algorithm is very fast and efficient. - Author(s): Meng Zhang ; Guang Jiang ; Chengke Wu ; Long Quan
- Source: Electronics Letters, Volume 48, Issue 13, p. 764 –765
- DOI: 10.1049/el.2012.0126
- Type: Article
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The detection of the horizontal plane or its normal direction is important in the processing of 3D point clouds of buildings. Generally, the horizontal plane is detected from clues of vanishing points of visual images or from the border detection of 3D point data. However, these methods are not fit for most building structures of various kinds. Presented is a novel detection method to extract directly the horizontal plane from 3D point clouds of buildings. Experimental results demonstrate that the method is simple and robust. - Author(s): N. Martinel and G.L. Foresti
- Source: Electronics Letters, Volume 48, Issue 13, p. 765 –767
- DOI: 10.1049/el.2012.1607
- Type: Article
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A novel appearance-based method for person re-identification is proposed. The approach exploits three local features to extract the shape and the chromatic appearance of an individual. Robustness against low resolution images, viewpoint and illumination changes, occlusions and pose variations is achieved by a novel signature. A body part division is used to propose a novel distance measure. The method has been compared to state-of-the-art methods using a re-identification benchmark dataset. Results show that the proposed solution outperforms state-of-the-art methods used for comparison.
Active contours for fast texture segmentation
Horizontal plane detection from 3D point clouds of buildings
Multi-signature based person re-identification
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- Author(s): X. Yang ; X. Tao ; Y.J. Guo ; X. Huang ; Q. Cui
- Source: Electronics Letters, Volume 48, Issue 13, p. 767 –768
- DOI: 10.1049/el.2012.0366
- Type: Article
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The modulated wideband converter (MWC) is an attractive analogue compressed sensing technique proposed recently. Unfortunately, the MWC has high hardware complexity owing to its parallel structure. To reduce the complexity, proposed is a novel subsampled circulant matrix based analogue compressed sensing (SCM-ACS) scheme. Using the cyclic shifts of the Zadoff-Chu sequence, the SCM-ACS scheme reduces the number of physical parallel channels from m to 1 with larger processing time, where m ranges from several dozen to several hundred. It is proved that when m=O(r log2M log3r) the measurement matrix of the SCM-ACS scheme satisfies the restricted isometry property condition with probability 1−M−O(1), where M is the length of the Zadoff-Chu sequence, and r is the sparsity of the input signal. Simulation results show that the SCM-ACS scheme outperforms the MWC on recovery performance.
Subsampled circulant matrix based analogue compressed sensing
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- Author(s): Jin Guan ; Lijun Zhang ; Zhengyu Sun ; Yongqing Leng ; Yatao Peng
- Source: Electronics Letters, Volume 48, Issue 13, p. 769 –770
- DOI: 10.1049/el.2012.0753
- Type: Article
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By combining a Wilkinson and a Gysel power divider (PD), a two-way PD has been designed, which contains two load resistors and one resistor between two output ports. There is a trade-off between the bandwidth and heat-handling capability for this proposed PD. For demonstration, one example PD is given. It has both acceptable bandwidth (about 66%) and acceptable heat-handling capability. - Author(s): J. Chéron ; M. Campovecchio ; D. Barataud ; T. Reveyrand ; M. Stanislawiak ; P. Eudeline ; D. Floriot
- Source: Electronics Letters, Volume 48, Issue 13, p. 770 –772
- DOI: 10.1049/el.2012.1654
- Type: Article
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Reported is a design methodology to efficiently control source and load impedances of a power GaN HEMT at the second-harmonic frequency inside a metal ceramic package. Second-harmonic source control is more precisely investigated. A specific filter is implemented at the gate side within the package to transform external source impedances into negative reactances seen by the internal device at second-harmonic frequencies. Whatever the external source termination presented at second-harmonic frequencies, source impedances seen by the internal die are confined to high efficiency regions. This methodology is applied to a 20 W packaged GaN HEMT using internal control of input and output second-harmonic impedances to reach more than 70% of power-added-efficiency (PAE) on 30% relative bandwidth in S-band. - Author(s): F.J. Clemente-Fernández ; J. Monzó-Cabrera ; J.M. Catalá-Civera ; J.L. Pedreño-Molina ; A.J. Lozano-Guerrero ; A. Díaz-Morcillo
- Source: Electronics Letters, Volume 48, Issue 13, p. 772 –774
- DOI: 10.1049/el.2012.1211
- Type: Article
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In this reported work it is shown that one of the most employed filtering systems for use in continuous-flow industrial microwave ovens, namely doubly corrugated filters, does not work properly for many values of the electric permittivity of the processed material when it is partially filled. Thus, a novel bandstop filter which solves these inconveniences, based on a combination of metallic irises and double corrugations, is designed by means of CST Microwave Studio® and experimentally validated.
Designing power divider by combining Wilkinson and Gysel structure
Over 70% PAE packaged GaN HEMT through wideband internal matching at second harmonic in S-band
Waveguide bandstop filter based on irises and double corrugations for use in industrial microwave ovens
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- Author(s): J. Shibayama ; T. Hirano ; J. Yamauchi ; H. Nakano
- Source: Electronics Letters, Volume 48, Issue 13, p. 774 –775
- DOI: 10.1049/el.2012.1462
- Type: Article
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A fundamental scheme is utilised to efficiently implement the frequency-dependent 3D locally one-dimensional FDTD method. The formulation is performed in matrix-operator-free forms in the right-hand sides of resultant equations. A modified procedure, in which implicit and explicit equations are alternately calculated, needs to retain only 10 field arrays, while the traditional explicit FDTD requires 12. Analysis of a gap plasmonic waveguide validates the presented 3D LOD-FDTD method. - Author(s): G.B. Xavier ; G.P. Temporão ; J.P. von der Weid
- Source: Electronics Letters, Volume 48, Issue 13, p. 775 –777
- DOI: 10.1049/el.2012.0850
- Type: Article
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It is experimentally demonstrated that a long distance actively stabilised Mach-Zehnder fibre optical interferometer can be used to reliably implement the GV95 quantum cryptography protocol employing orthogonal states. A proof-of-principle experiment using an interferometer composed of 1 km of spooled optical fibres connecting Alice and Bob is performed. The active stabilisation against phase drifts is done with a classical channel wavelength-multiplexed with the quantum channel and a highly stable visibility implying a quantum bit error rate of 2.2 % is shown. - Author(s): M. Nada ; Y. Muramoto ; H. Yokoyama ; T. Ishibashi ; S. Kodama
- Source: Electronics Letters, Volume 48, Issue 13, p. 777 –778
- DOI: 10.1049/el.2012.1081
- Type: Article
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A report is presented on an avalanche photodiode receiver optical subassembly module designed for 25 Gbit/s operations at 1310 nm. The receiver optical sub-assembly maintains 3 dB bandwidth as high as 18 GHz for a multiplication factor of up to 10. By 40 km singlemode fibre transmission measurements, receiver sensitivity of −21.7 dBm is demonstrated at a data rate of 25.8 Gbit/s for an input optical signal extinction ratio of 8, with a power penalty of 0.2 dB against the back-to-back condition.
Efficient implementation of frequency-dependent 3D LOD-FDTD method using fundamental scheme
Employing long fibre-optical Mach-Zehnder interferometers for quantum cryptography with orthogonal states
High-sensitivity 25 Gbit/s avalanche photodiode receiver optical sub-assembly for 40 km transmission
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- Author(s): C.-H. Hage ; F. Billard ; B. Kibler ; C. Finot ; G. Millot
- Source: Electronics Letters, Volume 48, Issue 13, p. 778 –780
- DOI: 10.1049/el.2012.1608
- Type: Article
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Cross-correlation measurements using the two-photon absorption process in a semiconductor is experimentally demonstrated for two pulses of different wavelengths (shifted by ∼200 nm) and durations (20 times ratio). These measurements were found to be highly repeatable and fully suitable for the determination of the temporal intensity profile of picosecond (ps) pulses. - Author(s): Lei Hou ; Wei Shi ; Xiaowei Han ; Zhijin Yan
- Source: Electronics Letters, Volume 48, Issue 13, p. 780 –781
- DOI: 10.1049/el.2012.1402
- Type: Article
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Terahertz emission power is one of the main obstacles for photoconductive antenna applications. In conventional photoconductive antennas, the electrical field distributes in a narrow area near to the anode, which limits the emission efficiency. A SI-GaAs antenna with AuGeNi ohmic contact electrodes was prepared by the present authors' improved fabrication technology, and the electrical field distributes more evenly when one electrode was biased by a DC square wave pulse or two electrodes were biased by two DC square wave pulses with opposed phases. Compared with the conventional antennas, the terahertz emission efficiency of the antenna was improved by one order when biased by the out-of-phase voltages and illuminating the whole antenna gap to suppress the carrier screening and radiation screening. - Author(s): K.K. Chow
- Source: Electronics Letters, Volume 48, Issue 13, p. 781 –783
- DOI: 10.1049/el.2012.0745
- Type: Article
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Super-continuum generation at 1 µm using amplified spontaneous emission noise burst instead of coherent ultra-short pulses is proposed and demonstrated. The noise burst is generated from pumping an ytterbium-doped fibre followed by external modulation. By launching the amplified noise burst into a highly-nonlinear photonic crystal fibre with dispersion zero at around 1 µm, depolarised super-continuum is generated over 500 nm with a 23 dBm average power. - Author(s): A.C. Busacca ; S. Stivala ; L. Curcio ; P. Livreri
- Source: Electronics Letters, Volume 48, Issue 13, p. 783 –784
- DOI: 10.1049/el.2011.4018
- Type: Article
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A report is presented on broadband second-harmonic generation in the range between 930 and 970 nm using random quasi-phase matching in a planar waveguide fabricated by soft proton exchange in congruent lithium tantalate. Bulk and waveguide measurements are compared, outlining the averaging role of guided-wave modes and their interactions with respect to spectral acceptance and near-field profile.
Direct temporal reconstruction of picosecond pulse by cross-correlation in semiconductor device
Enhanced terahertz emission from photoconductive antenna with ohmic contact electrodes biased by out-of-phase voltages
High average power super-continuum generation using 1 µm noise burst and highly-nonlinear photonic crystal fibre
Random quasi-phase matching in congruent lithium tantalate waveguides by proton exchange
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- Author(s): G. Tang ; J.-Q. Liu ; B. Yang ; J.-B. Luo ; H.-S. Liu ; Y.-G. Li ; C.-S. Yang ; V.-D. Dao ; K. Tanaka ; S. Sugiyama
- Source: Electronics Letters, Volume 48, Issue 13, p. 784 –786
- DOI: 10.1049/el.2012.1419
- Type: Article
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A piezoelectric MEMS vibration energy harvester with PMN-PT single material has been developed, which can convert low-level vibration energy into electrical energy. Compared with the conventional piezoelectric material, the PMN-PT single crystal has a higher coupling coefficient and electromechanical coefficient, which can improve the conversion efficiency of the power generating device. The designed device consists of a composite cantilever beam and an Ni proof mass, which is fabricated using UV-LIGA technology. Test results show that the fabricated vibration energy harvester can generate a maximum output power of 2.704 µW with a 2.08 VP-P output voltage, at a resonant frequency of 237.4 Hz and 1.0g acceleration level. - Author(s): I. Nagel ; L. Fabre ; M. Pastre ; F. Krummenacher ; R. Cherkaoui ; M. Kayal
- Source: Electronics Letters, Volume 48, Issue 13, p. 786 –788
- DOI: 10.1049/el.2012.1015
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Presented is a transistor-level implementation of a floating and tunable CMOS active inductor. It is based on the classical gyrator-C topology and is enhanced by adding an internal offset reduction mechanism to guarantee functionality also for unbalanced DC conditions. The realised inductance can be programmed for values between 685 µH and 12.4 mH and is designed to be implemented using standard CMOS technology. Its range of operation is from 250 to 750 kHz and the inductor consumption does not exceed 2 mW.
Piezoelectric MEMS low-level vibration energy harvester with PMN-PT single crystal cantilever
Tunable floating active inductor with internal offset reduction
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- Author(s): G.H. Chen and B.X. Chen
- Source: Electronics Letters, Volume 48, Issue 13, p. 788 –789
- DOI: 10.1049/el.2012.0549
- Type: Article
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Distributed subarray antennas (DSAs) have been proposed to enhance angular resolution and the accuracy of direction of arrival (DOA) estimation. This results in the well-known grating lobes in the array beampattern or ambiguities in DOA estimation. Presented is a slanting DSA composed of two widely-separated uniform rectangular arrays. By exploiting the translational invariance and the aperture coupling in the DSA configuration, a novel ambiguity resolution algorithm is proposed. It can provide closed-form, low-variance and automatically paired 2D direction cosine estimates. Simulation results are presented to verify the efficacy of the ambiguity resolution algorithm. - Author(s): H.-B. Tong ; G.-Z. Zhang ; G. Ou
- Source: Electronics Letters, Volume 48, Issue 13, p. 789 –791
- DOI: 10.1049/el.2012.0546
- Type: Article
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A robust GPS positioning algorithm with high efficiency is presented to reduce the positioning error caused by the outlier. First, the robustness is obtained by the outlier-insensitive initial estimate. The robust initial estimate is selected from the separated group estimates under the stringent criterion. Secondly, the weights of the pseudo-ranges are calculated with the initial estimate. Finally, the efficiency of the initial estimate is improved by performing the iterative reweighted recursive least squares with the updated weights. Experimental data-processing results show that the proposed algorithm is effective to resist the outlier which has contaminated the high leverage observation.
Eigenstructure-based ambiguity resolution algorithm for distributed subarray antennas VHF radar
Iterative reweighted recursive least squares for robust positioning
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- Author(s): H. Nam and E.J. Song
- Source: Electronics Letters, Volume 48, Issue 13, p. 791 –792
- DOI: 10.1049/el.2012.1404
- Type: Article
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Demonstrated is an n-channel oxide thin film transistor (TFT) inverter which achieves wider output dynamic range than a conventional one over the large threshold voltage range of oxide semiconductors. A proposed circuit adopts the two-stage inverter structure with two negative supplies and brings about low power consumption and fast rising transition as well. Simulation results show that the dynamic range is increased by 55.08% while power consumption and rising time are reduced by 23.71% and 60.54%, compared to a conventional one, on average. - Author(s): C. Shao ; P. Dasmahapatra ; J. Sexton ; M. Missous ; M.J. Kelly
- Source: Electronics Letters, Volume 48, Issue 13, p. 792 –794
- DOI: 10.1049/el.2012.1214
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Tunnel currents through semiconductor tunnel barriers have proved very difficult to control to the extent that device-to-device variability and wafer-to-wafer irreproducibility have prevented electronic devices based on tunnelling from ever going into production. With reference to a single tunnel barrier of AlAs in a GaAs multilayer structure with an asymmetric doping profile, it is shown that, with careful attention to detail, diodes from equivalent sites on three separate wafers can be produced whose average current in forward bias is within 1 % while the total in-wafer standard deviation of current at the same fixed bias (0.5 V) is 6 %, dominated by a systematic cross-wafer variation that is described. This level of reproducibility now enables these devices to be used in pick-and-place systems for the manufacture of low-cost hybrid integrated microwave circuits. - Author(s): S. Jandhyala and S. Mahapatra
- Source: Electronics Letters, Volume 48, Issue 13, p. 794 –795
- DOI: 10.1049/el.2012.1295
- Type: Article
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Since it is difficult to find the analytical solution of the governing Poisson equation for double gate MOSFETs with the body doping term included, the majority of the compact models are developed for undoped-body devices for which the analytical solution is available. Proposed is a simple technique to included a body doping term in such surface potential based common double gate MOSFET models also by taking into account any differences between the gate oxide thickness. The proposed technique is validated against TCAD simulation and found to be accurate as long as the channel is fully depleted.
Oxide TFT inverter with wide output dynamic range
Highly reproducible tunnel currents in MBE-grown semiconductor multilayers
Inclusion of body doping in compact models for fully-depleted common double gate MOSFET adapted to gate-oxide thickness asymmetry
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- Author(s): M. Ghaddar ; L. Talbi ; G.Y. Delisle
- Source: Electronics Letters, Volume 48, Issue 13, p. 795 –797
- DOI: 10.1049/el.2012.0397
- Type: Article
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Reported are the results of a coherence bandwidth experimental investigation of broadband propagation measurements for future millimetre-wave WLANs. Based on a sweeping-frequency sounding technique (59.6–60.6 GHz), the channel coherence bandwidth (Bc) is estimated in two typical indoor environments: (a) a 20 m, non-line-of-sight (NLOS) T-shaped corridors intersection, with and without the presence of a transmission route deflecting obstacle (DO), and (b) a line-of-sight (LOS) empty conference room. Results demonstrate thats millimetre-wave communications are very sensitive to the propagation environment. Thus, precise information of phases and amplitudes across the band of interest are essential for accurate estimation of the channel Bc. Results also indicate that the NLOS millimetre-wave environments are very hostile and the presence of DOs might enhance significantly the millimetre-wave propagation characteristics including the channel Bc. - Author(s): X. Li ; W.-H. Chen ; Z.-H. Feng ; F.M. Ghannouchi
- Source: Electronics Letters, Volume 48, Issue 13, p. 797 –798
- DOI: 10.1049/el.2012.1203
- Type: Article
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A dual-band tri-way Doherty power amplifier (PA) with frequency dependent power division is proposed. Compared to the dual-band two-way Doherty PA, the power back-off range of the dual-band tri-way Doherty PA is extended efficiently. Due to frequency dependent power division, the efficiency of the proposed PA is improved at two different frequencies concurrently. The measured results show that power-added efficiencies of 61 and 44% are reached at the 9 dB back-off point from saturation at 0.9 and 2.31 GHz, respectively. - Author(s): P. Yaghmaee ; C. Fumeaux ; B. Bates ; A. Manabe ; O.H. Karabey ; R. Jakoby
- Source: Electronics Letters, Volume 48, Issue 13, p. 798 –800
- DOI: 10.1049/el.2012.1366
- Type: Article
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A tunable resonator based on change of substrate permittivity is fabricated using a new high performance liquid crystal GT3-23001. The results show a measured frequency tuning range of 8.2% compared with a simulated 8.5% around a centre frequency of 2.8 GHz, with a lower insertion loss compared to standard liquid crystals. - Author(s): Zhaocheng Wang ; Linglong Dai ; Jun Wang
- Source: Electronics Letters, Volume 48, Issue 13, p. 800 –801
- DOI: 10.1049/el.2012.0205
- Type: Article
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Time domain synchronous OFDM outperforms cyclic prefix OFDM in spectral efficiency and fast synchronisation, but suffers from the difficulty of supporting 256QAM and the performance loss over doubly selective fading channels due to severe inter-block-interference (IBI). In this reported work, the groundbreaking theory of compressive sensing is explored to solve those open problems, whereby the IBI-free region of small size within the received training sequence is used to recover the high-dimensional channel without any IBI cancellation, and partial priori information of the channel is further exploited to reduce the complexity.
Coherence bandwidth measurement in indoor broadband propagation channel at unlicensed 60 GHz band
Design of dual-band tri-way GaN Doherty power amplifier with frequency dependent power division
Frequency tunable S-band resonator using nematic liquid crystal
Priori information aided compressive sensing for time domain synchronous OFDM
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