Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 44, Issue 19, 11 September 2008
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Volume 44, Issue 19
11 September 2008
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- Author(s): F. Yang ; P. Zhang ; C.-J. Guo ; J.-D. Xu
- Source: Electronics Letters, Volume 44, Issue 19, p. 1103 –1104
- DOI: 10.1049/el:20081818
- Type: Article
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To improve an elliptical cross-section helical antenna's radition performance, an elliptical helical antenna with a variable pitch angle is proposed. Its radiation patterns are simulated by the moment method and FEKO software. The results show that its circular polarisation as well as its directivity can be improved compared with an elliptical helical antenna of the same coil number, axial size and arm length. - Author(s): J. Jung ; H. Lee ; Y. Lim
- Source: Electronics Letters, Volume 44, Issue 19, p. 1104 –1106
- DOI: 10.1049/el:20082265
- Type: Article
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A compact band-notched ultra-wideband antenna with parasitic elements having small dimensions (12.7×21.6×1.6 mm) is proposed. With the use of a modified half-circular patch and half-wavelength parasitic lines, the proposed antenna has very wide impedance bandwidth measured at 8.6 GHz. By placing a parasitic loop, a band-notched frequency of 5.16 to 5.98 GHz is achieved. The group delay and transmission loss are measured and discussed. - Author(s): L. Luo ; Z. Cui ; J.-P. Xiong ; X.-M. Zhang ; Y.-C. Jiao
- Source: Electronics Letters, Volume 44, Issue 19, p. 1106 –1107
- DOI: 10.1049/el:20081548
- Type: Article
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A compact ultra-wideband microstrip-fed planar antenna with dual band-notch characteristic is presented. Two notched frequency bands are achieved by embedding an E-slot in the radiation patch and a U-slot defected ground structure in the feeding line. Moreover, the two notched bands can be controlled by adjusting the length of the corresponding slot. Experimental results show that the proposed antenna, with compact size of 35×14 mm, has an impedance bandwidth of 2.87–10.91 GHz for a voltage standing-wave ratio less than 2, except two frequency notched bands of 3.49–4.12 and 5.66–6.43 GHz. - Author(s): C. Biancotto and P. Record
- Source: Electronics Letters, Volume 44, Issue 19, p. 1107 –1109
- DOI: 10.1049/el:20081840
- Type: Article
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A conical steerable dielectric resonator antenna is presented and analysed using an in-house developed FDTD simulator. A 30% impedance bandwidth is achieved with an average gain of 6.5 dBi. Radiation patterns in the principal planes do not change significantly within the impedance bandwidth, presenting more than 18 dB front-to-back ratio in the azimuthal plane. - Author(s): X. Yang ; Z. Yu ; Q. Shi ; R. Tao
- Source: Electronics Letters, Volume 44, Issue 19, p. 1109 –1110
- DOI: 10.1049/el:20081808
- Type: Article
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A novel small ultra-wideband antenna (UWB) design using an individual split-ring resonator and coupled microstrip line structure is proposed. The radiation property of the antenna is numerically simulated and experimentally measured. The absolute frequency band, where S11 is less than −10 dB, is found to be across the entire UWB spectrum from 3.6 to 14.6 GHz. The gain at every frequency for the antenna is larger than 2.4 dBi. - Author(s): W.-L. Chen ; G.-M. Wang ; C.-X. Zhang
- Source: Electronics Letters, Volume 44, Issue 19, p. 1110 –1111
- DOI: 10.1049/el:20081502
- Type: Article
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A switched-beam antenna with reduced size and broadside beam based on the fractal Butler feeding network and fractal patch antenna array is proposed. The circuit sizes of the fractal-shaped branch-line couplers, 0 dB crossovers, and patch antennas, are 43.7, 50.1 and 74% smaller than their conventional counterparts, respectively. A four-beam prototype has been constructed. Measurement indicates that broadside beams with sidelobes below −10 dB are achieved. - Author(s): J. Fostier and F. Olyslager
- Source: Electronics Letters, Volume 44, Issue 19, p. 1111 –1113
- DOI: 10.1049/el:20081792
- Type: Article
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In the parallel multilevel fast multipole algorithm (MLFMA), there exist two fundamental partitioning schemes for the distribution of the workload across processors: the spatial distribution of boxes and the spectral distribution of field samples. These two schemes can be combined in various manners. It is analytically and numerically shown that, in two dimensions, the recently introduced hierarchical approach yields a scalable parallel MLFMA. For the three-dimensional case, it is proved that only the combination of the hierarchical partitioning scheme and a two‐dimensional partitioning of the field samples leads to a scalable algorithm. - Author(s): A. Mahanfar ; C. Menon ; R.G. Vaughan
- Source: Electronics Letters, Volume 44, Issue 19, p. 1113 –1114
- DOI: 10.1049/el:20081013
- Type: Article
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A novel concept for implementation of smart antennas is introduced. Deformable smart materials, as parasitic elements to alter the antenna pattern, are demonstrated. Such a reconfiguration can be used for improved spectral efficiency through diversity-type techniques. The approach effectively allows replacement of much RF circuitry and the signal processing modules present in a conventional array, by simple, low-cost, low power, smart materials. A basic, proof-of-concept prototype comprising a radiating monopole and a deformable conductive strip made of ionic polymeric–metal composite is presented. The deformable conductive strip has a voltage-controlled slant angle and its close proximity to the monopole reconfigures the pattern. Physical measurements verify the operation of the antenna. The impedance matching is also discussed. - Author(s): E. Reusens ; W. Joseph ; G. Vermeeren ; L. Verloock ; L. Martens
- Source: Electronics Letters, Volume 44, Issue 19, p. 1115 –1116
- DOI: 10.1049/el:20080400
- Type: Article
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Transmission between small antenna coils at 10.8 MHz is investigated in free space and near a flat, conducting medium for different separations between the coils and heights above the medium. Models are derived, and a physical explanation is given. Excellent agreement is obtained between the measurements and the models. - Author(s): Y. Okamoto and A. Hirose
- Source: Electronics Letters, Volume 44, Issue 19, p. 1116 –1117
- DOI: 10.1049/el:20082320
- Type: Article
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A novel single-port wideband discone antenna is proposed, which has variable directivity realised by changing fed cone elements. In the results of the measurements, it is confirmed that the directivity of the antenna can be changed while fractional bandwidth is larger than 0.76. The antenna will improve SINR and reduce transmission power in UWB communication systems adaptively.
Axial-mode elliptical helical antenna with variable pitch angle
Compact band-notched ultra-wideband antenna with parasitic elements
Compact printed ultra-wideband monopole antenna with dual band-notch characteristic
Conical steerable dielectric resonator antenna
Design of novel ultra-wideband antenna with individual SRR
Fractal-shaped switched-beam antenna with reduced size and broadside beam
Provably scalable parallel multilevel fast multipole algorithm
Smart antennas using electro-active polymers for deformable parasitic elements
Transmission model for coils near flat conducting medium simulating wireless body area network at 10.8 MHz
Wideband adaptive antenna using selective feeding and stagger tuning
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- Author(s): Y.J. Choi ; S.W. Yun ; P. Park
- Source: Electronics Letters, Volume 44, Issue 19, p. 1117 –1119
- DOI: 10.1049/el:20081492
- Type: Article
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A quantised feedback control for the asymptotic stabilisation of a system with a finite-level logarithmic quantiser is proposed. The main idea is to employ one from among the current, upper and lower quantising levels as the quantised input to maintain the decreasing property of a Lyapunov function. The resulting controller allows for an arbitrarily small quantisation density, whereas existing controllers in the literature do not, in the finite-level logarithmic quantiser for asymptotic stabilisation.
Asymptotic stabilisation of system with finite-level logarithmic quantiser
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- Author(s): T. Lepetit ; É. Akmansoy ; M. Paté ; J.-P. Ganne
- Source: Electronics Letters, Volume 44, Issue 19, p. 1119 –1121
- DOI: 10.1049/el:20081447
- Type: Article
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An all-dielectric metamaterial consisting of a high-constrast dielectric 2D photonic crystal was fabricated. This metamaterial exhibits resonant magnetism in the X-band frequency range and its permeability is negative over a 1.5 GHz range.
Broadband negative magnetism from all-dielectric metamaterial
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- Author(s): K.-I. Oh ; L.-S. Kim ; K.-I. Park ; Y.-H. Jun ; K. Kim
- Source: Electronics Letters, Volume 44, Issue 19, p. 1121 –1123
- DOI: 10.1049/el:20081833
- Type: Article
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A multi-phase digital delay-locked loop (DLL) capable of a low-jitter feature for DDR memory interface is reported. The DLL repeatedly selects the output clock edge which is closest to the reference clock edge to reduce the total jitter. A test chip was fabricated in a 0.18 µm CMOS process to verify its functionality. The measured RMS and peak-to-peak jitter of the DLL are 6.2 and 20.4 ps, respectively. The power consumption of the DLL is 12 mW from a 1.8 V supply voltage.
Low-jitter multi-phase digital DLL with closest edge selection scheme for DDR memory interface
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- Author(s): G. Rajan ; Y. Semenova ; G. Farrell
- Source: Electronics Letters, Volume 44, Issue 19, p. 1123 –1124
- DOI: 10.1049/el:20081233
- Type: Article
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An all-fibre temperature sensor is proposed based on a macro-bend singlemode fibre loop using a ratiometric power measurement scheme. The sensor has a linear characteristic with temperature at a fixed wavelength and bend radius. A direct linear relationship between the bend loss of the singlemode fibre and temperature is reported for the first time. By measuring the change in bend loss of the system a change in temperature can be measured assuming the system is calibrated. The proposed sensor has a higher temperature resolution than other conventional fibre-optic sensors and also benefits from simplicity.
All-fibre temperature sensor based on macro-bend singlemode fibre loop
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- Author(s): K. Zhang ; S. Ma ; D. Zhao ; W. Gao
- Source: Electronics Letters, Volume 44, Issue 19, p. 1124 –1126
- DOI: 10.1049/el:20081300
- Type: Article
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A directional residue prediction method is proposed, in which motion-aligned neighbouring residues are used in the directional prediction for residues in an inter-block. Corresponding motion estimation strategies are also designed. Experiments show that the bit rate saving can be up to 20% with a negligible decoding complexity increase. - Author(s): R. Ahmed ; G.C. Karmakar ; L.S. Dooley
- Source: Electronics Letters, Volume 44, Issue 19, p. 1126 –1127
- DOI: 10.1049/el:20080407
- Type: Article
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As texture represents one of the key perceptual attributes of any object, integrating textural information into existing video object segmentation frameworks affords the potential to achieve semantically improved performance. While object segmentation is fundamentally pixel-based classification, texture is normally defined for the entire image, which raises the question of how best to directly specify and characterise texture as a pixel feature. Introduced is a generic strategy for representing textural information so it can be seamlessly incorporated as a pixel feature into any video object segmentation paradigm. Both numerical and perceptual results upon various test sequences reveal considerable improvement in the object segmentation performance when textural information is embedded.
Directional residue prediction with motion alignment for video coding
Texture as pixel feature for video object segmentation
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- Author(s): M.U. Nair ; Y.J. Zheng ; Y. Lian
- Source: Electronics Letters, Volume 44, Issue 19, p. 1127 –1129
- DOI: 10.1049/el:20081980
- Type: Article
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A low-noise amplifier (LNA) for the lower ultra wideband (UWB) communication bandwidth (3.1–4.8 GHz) utilising area and power efficient active inductor implementation is presented. A loss regulated active inductor structure is used to realise shunt peaking inductances, which enable the design to attain a tunable peak S21 of 14.85 dB with a −3 dB bandwidth of 2.75–4.9 GHz. Implemented in 0.18 µm CMOS technology with a 1 V supply voltage, the LNA core consumes 7.1 mA while occupying an area of only 0.05 mm2. - Author(s): S. Dong ; X. Du ; Y. Han ; M. Huo ; Q. Cui ; D. Huang
- Source: Electronics Letters, Volume 44, Issue 19, p. 1129 –1130
- DOI: 10.1049/el:20081073
- Type: Article
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Because of its simple structure and snapback characteristics, the grounded-gate NMOS (GGNMOS) has been widely used as an electrostatic discharge (ESD) protection device. ESD performance of GGNMOS fabricated in the 65 nm CMOS process is investigated, and measurement results for the snapback behaviour, failure current It2, holding voltage, and trigger voltage of such advanced MOS devices are illustrated. The effects of four key GGNMOS parameters, channel length, finger number, drain-to-gate spacing and source-to-gate spacing on the ESD performance, are considered, and optimal MOS structures for robust ESD protection applications are suggested. - Author(s): P.A. Dal Fabbro and M. Kayal
- Source: Electronics Letters, Volume 44, Issue 19, p. 1131 –1132
- DOI: 10.1049/el:20089196
- Type: Article
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Coupled inductors can be used as tunable inductances. Employing coupled inductors in the output impedance matching network of an RF power amplifier leads to superior performance when operating in more than one frequency band. As proof of this concept, the design of a dual-band RF power amplifier for the 200 and 300 MHz bands is presented. Simulation and measurement results validate the technique. - Author(s): P.R. Wilson and R. Wilcock
- Source: Electronics Letters, Volume 44, Issue 19, p. 1132 –1134
- DOI: 10.1049/el:20081409
- Type: Article
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Continued process scaling has led to significant yield and reliability challenges for today’s designers. Analogue circuits are particularly susceptible to poor variation, driving the need for new yield resilient techniques in this area. A new configurable analogue transistor structure and supporting methodology that facilitates variation compensation at the post-manufacture stage is described. The approach has demonstrated significant yield improvements and can be applied to any analogue circuit. - Author(s): D. Duval ; C. Tarabout ; F. Artzner ; E. Gaviot ; A. Renault ; B. Bêche
- Source: Electronics Letters, Volume 44, Issue 19, p. 1134 –1135
- DOI: 10.1049/el:20081672
- Type: Article
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The first developments for a new integrated photonics using optical evanescent coupling from organic microstructures to fibres of hybrid nanotubes (NT) are reported. Microstructures are organic discs acting as photon reservoirs, integrated on a photonic chip fabricated by microtechnologic processes. Biomimetic peptidic/silica NT are realised by molecular self-assembly allowing centimetres long fibres of NT. Such heterostructures have been included directly on the organic as an innovative solution based on an NT in situ chip-approach. The latter allowed us to obtain an adequate evanescent coupling localised between micronic-discs and fibrous structures. Highlighted is a specific photonic propagation along various heterostructured-NT-fibres featuring distances beyond the centimetre and losses inferior to 1 dB/cm. It presents an advantageous confinement marked with strong energy localisations between NT.
1 V, 0.18 µm-area and power efficient UWB LNA utilising active inductors
Analysis of 65 nm technology grounded-gate NMOS for on-chip ESD protection applications
RF power amplifier employing a frequency-tunable impedance matching network based on coupled inductors
Yield improvement using configurable analogue transistors
Development of new practical approach to integrated photonics based on biomimetic molecular self-assembled nanotubes
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- Author(s): A.H. Quarterman ; K.G. Wilcox ; S.P. Elsmere ; Z. Mihoubi ; A.C. Tropper
- Source: Electronics Letters, Volume 44, Issue 19, p. 1135 –1137
- DOI: 10.1049/el:20081452
- Type: Article
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An optical Stark modelocked vertical-external-cavity surface-emitting laser producing sub-500 fs pulses at a fundamental repetition rate of 1 GHz was actively stabilised by locking its output to a 10 MHz electrical oscillator using a programmable phase-locked-loop frequency synthesiser. The timing jitter was characterised by the von der Linde method and was found to be 190(12) fs in the bandwidth 300 Hz to 1.5 MHz. - Author(s): A.C. Arivazhagan ; S. Sivaprakasam ; P.S. Spencer ; K.A. Shore
- Source: Electronics Letters, Volume 44, Issue 19, p. 1137 –1138
- DOI: 10.1049/el:20081720
- Type: Article
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Synchronisation of a mutually coupled external cavity chaotic diode laser and a solitary laser collapses and revives depending on the optical phase of the external cavity diode laser.
Active stabilisation and timing jitter characterisation of sub-500 fs pulse passively modelocked VECSEL
Collapse and revival of synchronisation of chaotic diode lasers
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- Author(s): H. Liu ; W. Li ; Y. Yang
- Source: Electronics Letters, Volume 44, Issue 19, p. 1138 –1140
- DOI: 10.1049/el:20081920
- Type: Article
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Compact quasi-elliptic bandpass filters using hexagonal open-loop resonators are presented. To miniaturise circuit size, a pair of capacitive side-coupled stubs and two pairs of spurlines are placed skilfully into the filter structure. The new filter operating at 1.65 GHz was analysed, simulated and fabricated. Good agreement between simulations and measurements verified the validity of the methodology. Moreover, the circuit size only occupies 21.1×14.1 mm2 (≃0.21λg×0.14λg). - Author(s): I.M. Kang ; T.-H. Choi ; J.H. Joe ; S.-J. Jung ; J. Jung ; H. Lee ; G. Jo ; Y.-K. Kim ; H.-G. Kim ; K.-M. Choi
- Source: Electronics Letters, Volume 44, Issue 19, p. 1140 –1141
- DOI: 10.1049/el:20081339
- Type: Article
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A radio-frequency (RF) equivalent circuit model for the metal–insulator–metal (MIM) capacitor with both side bottom plate contact is presented. The proposed model consists of 3-distributed RC networks and substrate networks. The accuracy of the MIM capacitor model is verified for Z-parameters, effective capacitance (Ceff), quality factor (Q), and MIM capacitor impedance (Zc) up to 20 GHz. The effects of substrate network components on MIM's frequency characteristics are also analysed through Z-parameters. Finally, the cutoff frequency of the MIM is extracted from Q-factor and Zc. - Author(s): J. Jeon ; J. Kim ; Y. Kwon
- Source: Electronics Letters, Volume 44, Issue 19, p. 1141 –1143
- DOI: 10.1049/el:20080769
- Type: Article
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The design of a temperature compensating bias circuit applicable to GaAs HBT radio frequency (RF) power amplifiers (PAs) is presented. It is developed by adding a simple voltage-compensation circuit to the existing base bias circuit. It is applied to a stage bypass RF PA and the experimental results show that the quiescent current (Q-current) remains nearly unchanged over a temperature range between −30–85°C, which markedly improves the linearity of the PA at low temperatures. - Author(s): Ž. Kancleris ; R. Simniškis ; M. Dagys ; V. Tamošiūnas
- Source: Electronics Letters, Volume 44, Issue 19, p. 1143 –1144
- DOI: 10.1049/el:20081935
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An experimental investigation of a resistive sensor used for measuring high-power microwave pulse radiation in the X-band (waveguide WR-90) is presented. The resistive sensor was fabricated in accordance with the results of the numerical simulation providing a flat frequency response. Experimentally, a ±10% sensitivity variation has been obtained within the waveguide's frequency range.
Compact hexagonal open-loop resonator bandpass filters using capacitive side-coupled stub and spurline technique
RF model of 3-RC network structure for metal–insulator–metal capacitor
Temperature compensating bias circuit for GaAs HBT RF power amplifiers with stage bypass architecture
X-band resistive sensor for high-power microwave pulse measurement with flat frequency response
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- Author(s): D. Yang ; N. Wu ; L.-L. Yang ; L. Hanzo
- Source: Electronics Letters, Volume 44, Issue 19, p. 1144 –1146
- DOI: 10.1049/el:20081842
- Type: Article
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A flexible closed-loop multiple-input-multiple-output (MIMO) system amalgamating linear dispersion codes and eigen-beam transmission is proposed that achieves a higher capacity than the equivalent open‐loop scheme, at the cost of feeding back a modest number of feedback bits from the mobile to the base station using Grassmannian beamforming-vector quantisation. - Author(s): Y.-P. Hong ; S.-Y. Jin ; H.-Y. Song
- Source: Electronics Letters, Volume 44, Issue 19, p. 1146 –1147
- DOI: 10.1049/el:20081500
- Type: Article
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A coded N-ary pulse position modulated (PPM) ultra-wide bandwidth (UWB) impulse radio which exploits the chaotic time hopping and the polarity randomisation is considered. It is shown that the proposed system has a noise-like spectrum and its multi-user system is discussed. The bit error rate performance is confirmed by simulation based on the UWB indoor channel model.
Closed-loop linear dispersion coded eigen-beam transmission and its capacity
Coded N-ary PPM UWB impulse radio with chaotic time hopping and polarity randomisation
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- Author(s): Y. Chang ; C.-D. Lee ; Z.-H. Chen ; J.-H. Chen
- Source: Electronics Letters, Volume 44, Issue 19, p. 1147 –1149
- DOI: 10.1049/el:20081710
- Type: Article
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A novel, fast decoder for the binary quadratic residue code of length 23, or equivalently the famous Golay code is proposed. The core is a new idea to determine the syndrome weight. The decoding algorithm can be implemented with a parallel design, and the decoder based on this algorithm is not only very efficient but also of low area cost. It promises a binary Golay decoder which is faster than available decoders. - Author(s): D.S. Lin ; S. Tong ; S.Q. Li
- Source: Electronics Letters, Volume 44, Issue 19, p. 1149 –1150
- DOI: 10.1049/el:20081478
- Type: Article
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The design of a class of well-structured low-density parity-check (LDPC) codes, namely linear interleaver based concatenated zigzag (LICZ) codes, is investigated. With summary distances as the design metric, short LICZ codes with large minimum distances can be constructed. Moreover, an efficient cycle-based method is proposed to compute the minimum distances of LICZ codes. Simulation results show that LICZ codes outperform both CZ codes with random interleavers and LDPC codes by the progressive edge growth algorithm.
(23, 12, 7) quadratic residue decoder based on syndrome-weight determination
Joint linear interleaver design for concatenated zigzag codes
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- Author(s): J. Gao and Y. Su
- Source: Electronics Letters, Volume 44, Issue 19, p. 1151 –1152
- DOI: 10.1049/el:20081332
- Type: Article
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A simple 20 Gbit/s alternate-phase return-to-zero (APRZ) transmitter is demonstrated using a 10 Gbit/s integrated dual-parallel Mach-Zehnder modulator (DPMZM). Two RZ streams are time-multiplexed with stable and adjustable phase relation. Simulation results show that the APRZ generated by this transmitter is robust to nonlinear transmission impairments. - Author(s): D. Wu ; L. Qian ; W.S. Mohammed ; P.W.E. Smith
- Source: Electronics Letters, Volume 44, Issue 19, p. 1152 –1154
- DOI: 10.1049/el:20081594
- Type: Article
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Demonstrated is 40 Gbit/s multiple-fibre-channel wavelength conversion using a passive ultrafast reflective switch, and a 2D Fresnel lens array aligned to a fibre array. Input pulses of 1–2 ps duration and 0.3 nJ energy are wavelength converted to multiple channels with a tunable wavelength range of 20 nm and an extinction ratio better than 6 dB. Simultaneous 1-to-N conversion is also demonstrated.
Alternate-phase return-to-zero transmitter based on integrated dual-parallel Mach-Zehnder modulator
Multi-fibre-channel wavelength converter based on passive ultrafast switch
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- Author(s): V. Pačebutas ; A. Bičiūnas ; K. Bertulis ; A. Krotkus
- Source: Electronics Letters, Volume 44, Issue 19, p. 1154 –1155
- DOI: 10.1049/el:20081630
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A terahertz time-domain spectroscopy system based on a femtosecond Yb:KGW laser, a narrow-gap semiconductor surface emitter, and a photoconductive detector made from an Si-doped GaBiAs epitaxial layer is demonstrated. The spectral bandwidth of the system is larger than 4 THz, and its dynamical range exceeds 60 dB.
Optoelectronic terahertz radiation system based on femtosecond 1 µm laser pulses and GaBiAs detector
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- Author(s): W. Kruppa ; J.B. Boos ; B.R. Bennett ; N.A. Papanicolaou
- Source: Electronics Letters, Volume 44, Issue 19, p. 1155 –1157
- DOI: 10.1049/el:20082135
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The 1/f noise of antimonide-based p-channel HFETs has been measured for the first time. The devices are fabricated with an InAlSb/AlGaSb barrier and a strained In0.41Ga0.59Sb quantum-well channel, yielding a channel hole mobility of 1020 cm2/V s and a sheet density of 1.6×1012 cm−2. The low-frequency noise spectrum in the linear region has a pure 1/f slope with no generation–recombination component. The Hooge parameter, αH, varies between 3×10−4 and 9×10−3 depending on the gate bias. - Author(s): C.-P. Chang and Y.S. Wu
- Source: Electronics Letters, Volume 44, Issue 19, p. 1157 –1158
- DOI: 10.1049/el:20081620
- Type: Article
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p.
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In this process, amorphous silicon was first transformed to polycrystalline silicon (poly-Si) using a metal-induced lateral crystallisation (MILC) process, followed by annealing with a continuous-wave laser lateral (λ∼532 nm) crystallisation (CLC) with an output power of 3.8 W. MILC-CLC-TFT performed far superior to MILC-TFT. The mobility of the MILC-CLC-TFT was 293 cm2/Vs, which was much higher than that of MILC TFTs (54.8 cm2/Vs). In addition, MILC-CLC TFTs showed better device uniformity and reliability. - Author(s): C.-L. Fan ; T.-H. Yang ; C.-C. Lin ; C.-H. Huang
- Source: Electronics Letters, Volume 44, Issue 19, p. 1158 –1160
- DOI: 10.1049/el:20080735
- Type: Article
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The electrical characteristics of N2O-plasma treated pentacene thin-film transistors are investigated. The treatment can enhance the on current almost two times, increase the field-effect mobility (μFE) greater than 50%, and reduce the interface traps to 31%, compared to devices without plasma treatment. This improvement is presumably owing to pentacene crystallisation enhancement and the decreased traps state density between the pentacene and gate dielectric interface. The N2O-plasma treated gate dielectric has been found effective in improving organic thin-film transistor (OTFT) performance.
1/f noise of Sb-based p-channel HFETs
High performance poly-Si TFTs fabricated by continuous-wave laser annealing of metal-induced lateral crystallised silicon films
N2O-plasma effect on low-temperature deposited gate dielectric for organic thin-film transistors
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- Author(s): J. Ling ; P. Stoica ; J. Li ; Y.I. Abramovich
- Source: Electronics Letters, Volume 44, Issue 19, p. 1160 –1161
- DOI: 10.1049/el:20080631
- Type: Article
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Cyclic algorithms are conceptually simple and computationally efficient methods of estimating the sinusoidal parameters from noisy data. Two such algorithms are compared that are closely related to each other. Their differences are demonstrated using a numerical example. - Author(s): G. Jovanovic Dolecek and S.K. Mitra
- Source: Electronics Letters, Volume 44, Issue 19, p. 1162 –1163
- DOI: 10.1049/el:20081603
- Type: Article
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p.
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A simple second-order sine-based CIC (cascaded-integrator-comb) compensator is presented. The design parameter is the integer b, which depends on the number K of the cascaded CIC filters. The proposed filter performs compensation efficiently using only three additions/subtractions. - Author(s): X.Y. Bu ; Z.H. Liu ; K. Yang
- Source: Electronics Letters, Volume 44, Issue 19, p. 1163 –1165
- DOI: 10.1049/el:20081626
- Type: Article
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A new approach for unbiased direction-of-arrival (DOA) estimation suitable for dealing with CDMA multipath signals is presented. Normal DOA estimation methods such as MUSIC and ESPRIT produce biased results owing to the existence of coherent terms. However, it is shown that if data is first projected onto the orthogonal complement of the space spanned by the known steering vectors, then the coherent terms can be removed, thus allowing MUSIC/ESPRIT to be applied to obtain an unbiased result. It is shown that only two iterations of this process are needed to produce good results.
On using cyclic algorithms for sinusoidal parameter estimation
Simple method for compensation of CIC decimation filter
Unbiased DOA estimation for CDMA based on self-interference cancellation
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