Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 42, Issue 20, 28 September 2006
Volumes & issues:
-
Volume 59 (2023)
-
Volume 58 (2022)
-
Volume 57 (2021)
-
Volume 56 (2020)
-
Volume 55 (2019)
-
Volume 54 (2018)
-
Volume 53 (2017)
-
Volume 52 (2016)
-
Volume 51 (2015)
-
Volume 50 (2014)
-
Volume 49 (2013)
-
Volume 48 (2012)
-
Volume 47 (2011)
-
Volume 46 (2010)
-
Volume 45 (2009)
-
Volume 44 (2008)
-
Volume 43 (2007)
-
Volume 42 (2006)
-
Volume 41 (2005)
-
Volume 40 (2004)
-
Volume 39 (2003)
-
Volume 38 (2002)
-
Volume 37 (2001)
-
Volume 36 (2000)
-
Volume 35 (1999)
-
Volume 34 (1998)
-
Volume 33 (1997)
-
Volume 32 (1996)
-
Volume 31 (1995)
-
Volume 30 (1994)
-
Volume 29 (1993)
-
Volume 28 (1992)
-
Volume 27 (1991)
-
Volume 26 (1990)
-
Volume 25 (1989)
-
Volume 24 (1988)
-
Volume 23 (1987)
-
Volume 22 (1986)
-
Volume 21 (1985)
-
Volume 20 (1984)
-
Volume 19 (1983)
-
Volume 18 (1982)
-
Volume 17 (1981)
-
Volume 16 (1980)
-
Volume 15 (1979)
-
Volume 14 (1978)
-
Volume 13 (1977)
-
Volume 12 (1976)
-
Volume 11 (1975)
-
Volume 10 (1974)
-
Volume 9 (1973)
-
Volume 8 (1972)
-
Volume 7 (1971)
-
Volume 6 (1970)
-
Volume 5 (1969)
-
Volume 4 (1968)
-
Volume 3 (1967)
-
Volume 2 (1966)
-
Volume 1 (1965)
Volume 42, Issue 20
28 September 2006
-
- Author(s): X.L. Bao and M.J. Ammann
- Source: Electronics Letters, Volume 42, Issue 20, p. 1129 –1130
- DOI: 10.1049/el:20062015
- Type: Article
- + Show details - Hide details
-
p.
1129
–1130
(2)
A novel single-layer, single-feed concentric annular-ring microstrip patch antenna providing triple-frequency operation is proposed and experimentally studied. This is achieved by embedding a small circular patch into a dual stub-loaded concentric annular-ring structure and by employing a cross-slot in the ground plane. The proposed technique can provide triple-band operation and reduce the antenna size by over 50% compared to the conventional annular-ring patch antenna for a given frequency. Experimental results show the proposed antenna to have impedance bandwidths of 6.38, 6.30 and 35% for the three bands, at 1.17, 1.428 and 1.9 GHz, respectively. The proposed structure is capable of realising a dramatically small frequency ratio. The measured radiation patterns for each band are presented. - Author(s): S.-W. Su ; J.-H. Chou ; A. Chen ; L. Tai
- Source: Electronics Letters, Volume 42, Issue 20, p. 1130 –1132
- DOI: 10.1049/el:20061739
- Type: Article
- + Show details - Hide details
-
p.
1130
–1132
(3)
A compact patch antenna suitable for mounting above a conducting plate for WLAN operation in the 2.4 GHz band is presented. It is demonstrated that, by introducing a supporting metal plate connected to the antenna ground below, the proposed antenna in free space can easily be mounted at the corner of a conducting plate of various dimensions without rapidly deteriorating the antenna bandwidth. With a compact size of 20×20×6 mm, the antenna can be placed very close to a conducting plate of side length varied from 20 to 200 mm for application in a PC peripheral device. - Author(s): J. Chen and J. Wang
- Source: Electronics Letters, Volume 42, Issue 20, p. 1132 –1133
- DOI: 10.1049/el:20062011
- Type: Article
- + Show details - Hide details
-
p.
1132
–1133
(2)
Both the ADI-FDTD method and the CN-FDTD method can be viewed as approximate factorisation of the conventional FDTD scheme, so the error between these methods and the conventional FDTD method is obtained. It is shown that the error is associated with the time step size, the permittivity and the permeability of the medium, and the spatial variation rate of field. The space discretisation has no relation with the error, which is demonstrated by numerical examples. - Author(s): C.-L. Li ; J.-P. Chang ; L.-J. Wong
- Source: Electronics Letters, Volume 42, Issue 20, p. 1134 –1135
- DOI: 10.1049/el:20061982
- Type: Article
- + Show details - Hide details
-
p.
1134
–1135
(2)
A miniature monopole slot antenna implemented by suitably meandering the notch into a J shape and seriesly coupling to an open transmission line stub is reported. Overall occupation area of the proposed antenna, ∼7.94×7.41 mm2, is achieved. 10 dB impedance bandwidth of about 8% is obtained, which is twice that of a simple half-wavelength slot antenna tested. Guidelines for the design of the proposed antenna are provided. - Author(s): A.R. Chandran ; M. Gopikrishna ; C.K. Aanandan ; P. Mohanan ; K. Vasudevan
- Source: Electronics Letters, Volume 42, Issue 20, p. 1135 –1137
- DOI: 10.1049/el:20061712
- Type: Article
- + Show details - Hide details
-
p.
1135
–1137
(3)
Effective use of fractal-based metallo-dielectric structures for enhancing the radar cross-section (RCS) of dihedral corner reflectors is reported. RCS enhancement of about 30 dBsm is obtained for corner reflectors with corner angles other than 90°. This may find application in remote sensing and synthetic aperture radar. - Author(s): R. Dickie ; R. Cahill ; H.S. Gamble ; V.F. Fusco ; S.P. Rea ; N. Grant ; B. Moyna
- Source: Electronics Letters, Volume 42, Issue 20, p. 1137 –1138
- DOI: 10.1049/el:20062160
- Type: Article
- + Show details - Hide details
-
p.
1137
–1138
(2)
The design of a quasi-optical single sideband filter, which provides more than 30 dB of isolation between the frequency bands 294–305.5 and 329.5–341.5 GHz in the TM plane at 45° incidence, is described. The structure, which consists of three free-standing arrays of dipole slot elements, generates a bandpass spectral response with an insertion loss below 0.5 dB at resonance. Simulated and measured transmission coefficients in the range 250–400 GHz are shown to be in good agreement.
Compact concentric annular-ring patch antenna for triple-frequency operation
Compact patch antenna mountable above conducting plate for WLAN operation
Error between unconditionally stable FDTD methods and conventional FDTD method
Miniature planar notch antenna of J shape
Radar cross-section enhancement of dihedral corner reflector using fractal-based metallo-dielectric structures
Single sideband FSS with high image rejection
-
- Author(s): K.S. Abedin
- Source: Electronics Letters, Volume 42, Issue 20, p. 1138 –1140
- DOI: 10.1049/el:20061915
- Type: Article
- + Show details - Hide details
-
p.
1138
–1140
(3)
A highly sensitive method for measuring the Raman gain coefficient using short lengths of optical fibre is demonstrated. Square-wave modulation is applied to both the pump and the signal, and lock-in detection is performed at the sum modulation frequency. A Raman on/off gain as small as 0.0015 dB can be readily measured.
Improving measurement sensitivity of the Raman gain coefficient in optical fibres using pump/signal simultaneous lock-in detection
-
- Author(s): N. Chotikakamthorn
- Source: Electronics Letters, Volume 42, Issue 20, p. 1140 –1141
- DOI: 10.1049/el:20061758
- Type: Article
- + Show details - Hide details
-
p.
1140
–1141
(2)
An alternative formulation to the original Bayesian-based digital matting technique is described. With the new formulation, a user does not need to choose an image-dependent noise variance parameter, as in the original method. An iterative algorithm that avoids exhaustive search is provided. Performance comparison with the original method is given. - Author(s): A. Bock
- Source: Electronics Letters, Volume 42, Issue 20, p. 1141 –1143
- DOI: 10.1049/el:20061804
- Type: Article
- + Show details - Hide details
-
p.
1141
–1143
(3)
The bit rate required to compress the same content in different HDTV scanning formats to the same level of picture quality is calculated from simulation results. It is shown that the 1080p50 format does not require higher bit rates than the conventional 1080p25 format. - Author(s): R. Razavi ; M. Fleury ; E. Jammeh ; M. Ghanbari
- Source: Electronics Letters, Volume 42, Issue 20, p. 1143 –1145
- DOI: 10.1049/el:20061638
- Type: Article
- + Show details - Hide details
-
p.
1143
–1145
(3)
The Bluetooth wireless link is likely to be the last hop in the delivery of an encoded streamed video clip. It is shown that it is preferable to optimally map arriving IP packets onto Bluetooth packets than to preserve the stream's internal synchronisation structure. Video quality improves and latency reduces, even when there is cross traffic on the piconet. - Author(s): S.-W. Han and E. Yoon
- Source: Electronics Letters, Volume 42, Issue 20, p. 1145 –1146
- DOI: 10.1049/el:20061652
- Type: Article
- + Show details - Hide details
-
p.
1145
–1146
(2)
A low dark current CMOS image sensor pixel which can be easily implemented using a standard CMOS technology without any process modification is presented. Dark current is mainly generated from the interface region between the shallow trench isolation (STI) and the active region. The proposed pixel can reduce dark current by separating the STI region from a photodiode, using a simple layout modification to enclose the photodiode junction with the P-well. A test sensor array has been fabricated using 0.18 µm standard CMOS process and its performance characterised. The dark current of the proposed pixel has been measured as 0.93fA/pixel, which is by a factor of two smaller than that of the conventional design. - Author(s): M. Jiang ; D. Crookes ; S. Davidson ; R. Turner
- Source: Electronics Letters, Volume 42, Issue 20, p. 1146 –1148
- DOI: 10.1049/el:20061972
- Type: Article
- + Show details - Hide details
-
p.
1146
–1148
(3)
A novel power-efficient systolic array architecture is proposed for full search block matching (FSBM) motion estimation, where the partial distortion elimination algorithm is used to dynamically switch off the computation of eliminated partial candidate blocks. The RTL-level simulation shows that the proposed architecture can reduce the power consumption of the computation part of the algorithm to about 60% of that of the conventional 2D systolic arrays.
Alternative formulation of Bayesian-based digital matting technique
Bit rate requirements of different HDTV scanning formats
Efficient packetisation scheme for Bluetooth video transmission
Low dark current CMOS image sensor pixel with photodiode structure enclosed by P-well
Low-power systolic array processor architecture for FSBM video motion estimation
-
- Author(s): U. Brunsmann and Th. Tille
- Source: Electronics Letters, Volume 42, Issue 20, p. 1148 –1149
- DOI: 10.1049/el:20062546
- Type: Article
- + Show details - Hide details
-
p.
1148
–1149
(2)
Time-to-digital conversion is investigated as a new method to record highly sensitive responses of semiconductor gas sensors. The method is evaluated by exposing metal oxide gas sensors to very low carbon monoxide (CO) concentrations. The noise equivalent detection limit is about 0.5 ppb CO.
High resolution readout of metal oxide gas sensors using time-to-digital conversion
-
- Author(s): C. Sawigun and A. Demosthenous
- Source: Electronics Letters, Volume 42, Issue 20, p. 1149 –1151
- DOI: 10.1049/el:20062093
- Type: Article
- + Show details - Hide details
-
p.
1149
–1151
(3)
A compact architecture for a four-quadrant analogue multiplier circuit is presented. The circuit is formed by connecting common source amplifiers with a pair of differential flipped voltage followers. This results in a novel cancellation of the nonlinear terms in the sub-currents, leading to the desired four-quadrant analogue multiplier. The circuit combines low complexity with low-voltage operation and low static power consumption. Simulated results using a 0.35 µm CMOS process are provided. - Author(s): P. Descamps ; C. Barbier-Petot ; C. Biard ; S. Bardy
- Source: Electronics Letters, Volume 42, Issue 20, p. 1151 –1152
- DOI: 10.1049/el:20061830
- Type: Article
- + Show details - Hide details
-
p.
1151
–1152
(2)
Substrate coupling may severely degrade the electrical performances of high-speed and RF integrated circuits. An isolation technique study of parasitic effects due to substrate coupling between two blocks of integrated circuits in an RF CMOS 90 nm technology is presented. Isolation performances are compared for both bulk silicon (Si) and silicon-on-insulator (SOI) substrate. For every substrate, a compact electrical model matching well with measurement results is proposed for test structures composed of 50×50 µm cells surrounded with an appropriate guard ring. An isolation improvement of 10 dB is reached by an additional P-type guard ring placed around one cell and an isolation level of 45 dB is achieved at 1 GHz for bulk Si substrate. - Author(s): D. Huang and M.-C.F. Chang
- Source: Electronics Letters, Volume 42, Issue 20, p. 1152 –1154
- DOI: 10.1049/el:20062427
- Type: Article
- + Show details - Hide details
-
p.
1152
–1154
(3)
A phase-coherent transformer (PCT) enabled 22 GHz dynamic frequency divider in 0.18 µm CMOS with 16 dB power gain, 7 dB phase noise reduction and superb speed-gain/power FOM of 2×102/pJ is demonstrated. The on-chip PCT enforces energy reverberation between the sensing/latching stages and enhances the frequency divider efficiency by eliminating the ‘slave’ stage and the buffer amplifiers.
Compact low-voltage CMOS four-quadrant analogue multiplier
Performance comparison of substrate coupling effect between silicon and SOI substrates in RF-CMOS technology
Phase-coherent frequency divider with high speed-gain/power figure-of-merit
-
- Author(s): J. Dong ; A. Shirakawa ; K. Takaichi ; K. Ueda ; H. Yagi ; T. Yanagitani ; A.A. Kaminskii
- Source: Electronics Letters, Volume 42, Issue 20, p. 1154 –1156
- DOI: 10.1049/el:20062407
- Type: Article
- + Show details - Hide details
-
p.
1154
–1156
(3)
A laser-diode-pumped all-ceramic passively Q-switched Yb:YAG microchip laser with Cr4+:YAG as a saturable absorber has been demonstrated for the first time. A pulse width of 380 ps and a peak power of over 82 kW at a repetition rate of 12.4 kHz was obtained. A slope efficiency of 37% and an optical-to-optical efficiency of 30% was achieved. - Author(s): W. Lee ; M.-T. Choi ; H. Izadpanah ; P.J. Delfyett
- Source: Electronics Letters, Volume 42, Issue 20, p. 1156 –1157
- DOI: 10.1049/el:20062603
- Type: Article
- + Show details - Hide details
-
p.
1156
–1157
(2)
Relative intensity noise (RIN) characteristics of a frequency stabilised grating-coupled modelocked semiconductor laser (MSL) have been experimentally investigated. Reported is the first measurement, to the authors' knowledge, of general RIN characteristics as well as RIN reduction in the frequency stabilised MSL system showing the relationship between RIN and mode coherency in the MSL. - Author(s): T. Kettler ; K. Posilovic ; O. Schulz ; L.Ya. Karachinsky ; I.I. Novikov ; Yu.M. Shernyakov ; S.M. Kuznetsov ; N.Yu. Gordeev ; M.V. Maximov ; U. Ben-Ami ; A. Sharon ; S.S. Mikhrin ; A.R. Kovsh ; V.A. Shchukin ; P.S. Kop'ev ; N.N. Ledentsov ; U.W. Pohl ; D. Bimberg
- Source: Electronics Letters, Volume 42, Issue 20, p. 1157 –1159
- DOI: 10.1049/el:20062221
- Type: Article
- + Show details - Hide details
-
p.
1157
–1159
(3)
GaAs/AlGaAs 850 nm range lasers based on a longitudinal photonic bandgap crystal waveguide show narrow vertical far-field pattern. Vertical and lateral beam divergence with FWHM below 10° and 5°, respectively, is demonstrated for 4 µm stripe width, being independent on injection current. Excellent beam quality with M2=1.4, low internal losses of 1.4 cm−1 and high differential quantum efficiency of 83% are observed. - Author(s): K.G. Wilcox ; F. Rutz ; R. Wilk ; H.D. Foreman ; J.S. Roberts ; J. Sigmund ; H.L. Hartnagel ; M. Koch ; A.C. Tropper
- Source: Electronics Letters, Volume 42, Issue 20, p. 1159 –1161
- DOI: 10.1049/el:20061825
- Type: Article
- + Show details - Hide details
-
p.
1159
–1161
(3)
A source of terahertz radiation based on a LT-GaAsSb antenna excited by a 1.04 µm 480 fs pulse train from a vertical external cavity surface emitting laser is described. Images of samples were acquired using bolometer detection.
All-ceramic passively Q-switched Yb:YAG/Cr4+:YAG microchip laser
Relative intensity noise characteristics of frequency stabilised grating-coupled modelocked semiconductor laser
Single transverse mode 850 nm GaAs/AlGaAs lasers with narrow beam divergence
Terahertz imaging system based on LT-GaAsSb antenna driven by all-semiconductor femtosecond source
-
- Author(s): C.Y. Wang
- Source: Electronics Letters, Volume 42, Issue 20, p. 1161 –1162
- DOI: 10.1049/el:20062550
- Type: Article
- + Show details - Hide details
-
p.
1161
–1162
(2)
Frequencies of the circular segment waveguide are determined by the Ritz method. It is found that the cutoff frequency corresponds to an anti-symmetric TE mode. The waveguide with small thickness is also discussed. - Author(s): R. Gómez-García
- Source: Electronics Letters, Volume 42, Issue 20, p. 1162 –1164
- DOI: 10.1049/el:20062039
- Type: Article
- + Show details - Hide details
-
p.
1162
–1164
(3)
A new type of sharp, high-rejection wideband microstrip filter based on signal-interference techniques is reported. The proposed topology uses, for the first time, rat-race couplers operating as transversal filtering sections (TFSs). Design equations and guidelines for this TFS are provided. Furthermore, to prove its experimental usefulness, a 6.5 GHz ultra-wideband prototype has been synthesised, constructed and measured.
Frequencies of circular segment waveguide
High-rejection wideband signal-interference microstrip filters using rat-race couplers
-
- Author(s): O. Fonseca and I.N. Psaromiligkos
- Source: Electronics Letters, Volume 42, Issue 20, p. 1164 –1165
- DOI: 10.1049/el:20061654
- Type: Article
- + Show details - Hide details
-
p.
1164
–1165
(2)
A new closed form expression for the bit error rate (BER) performance of binary phase shift keying (BPSK) transmissions over frequency selective channels is presented. The expression is obtained through a novel approximation of the Gaussian Q(·) function by a fixed series of sinusoids with exponentially decreasing amplitudes. Numerical results demonstrate the accuracy of the derived expression. - Author(s): D. Annalingam ; F.H. Ali ; E. Stipidis
- Source: Electronics Letters, Volume 42, Issue 20, p. 1165 –1167
- DOI: 10.1049/el:20062038
- Type: Article
- + Show details - Hide details
-
p.
1165
–1167
(3)
An effective design of successive joint blind multi-target (MT) adaptive antenna array (AAA) and interference cancellation is presented for multi-user detection of DS-CDMA. The MT-AAA employs the adaptive block size least square-constant modulus algorithm (LS-CMA) with pre-despreading at each antenna element combined with a simple weight adaptive canceller. The combined process is repeated successively for the detection of all users without any knowledge of the channel or training sequences. It is shown to utilise the advantages of both techniques and provides improved performance in fading channel for the near-far problem, in-beam interference, and a high number of users.
BER performance of BPSK transmissions over multipath channels
Successive blind multi-target adaptive antenna array and interference cancellation for DS-CDMA
-
- Author(s): M.R. Zahabi ; V. Meghdadi ; J.-P. Cances
- Source: Electronics Letters, Volume 42, Issue 20, p. 1167 –1169
- DOI: 10.1049/el:20062094
- Type: Article
- + Show details - Hide details
-
p.
1167
–1169
(3)
A scheme is proposed to decode a tail-biting convolutional code based on its Tanner graph, which is traditionally done using a forward–backward MAP algorithm. Therefore, decoding may be performed using a standard sum–product algorithm. With respect to decoding based on trellis, all variables in a Tanner graph are binary, which may lead to complexity reduction. A min-sum algorithm is used to decrease the analogue circuit complexity. Simulation shows there is no significant degradation compared with more complex traditional methods. - Author(s): H. Hu ; J. Pei ; L.F. Pan ; D. Lu
- Source: Electronics Letters, Volume 42, Issue 20, p. 1169 –1170
- DOI: 10.1049/el:20062297
- Type: Article
- + Show details - Hide details
-
p.
1169
–1170
(2)
A highly efficient four-to-six modulation (FSM) code suitable for high density blue laser recording channels is presented. Without inserting additional DC control bits, the low-frequency components of the FSM coded sequence can be suppressed successfully. In addition, the maximum number of repeated minimum transition runs in the coded sequence is no more than six. The code design approach and the performances of FSM are detailed.
Analogue decoding of tail-biting convolutional codes based on Tanner graph
Four-to-six modulation code for blue laser recording channels
-
- Author(s): J.M. Martinez ; J. Herrera ; F. Ramos ; J. Marti
- Source: Electronics Letters, Volume 42, Issue 20, p. 1170 –1172
- DOI: 10.1049/el:20061688
- Type: Article
- + Show details - Hide details
-
p.
1170
–1172
(3)
An all-optical correlator based on a single logic XOR gate is proposed. The device consists of an active Mach-Zehnder interferometer with an external feedback loop. The address/word detection functionality is demonstrated at 10 Gbit/s with 2-bit optical labels. - Author(s): S.-B. Park ; D.K. Jung ; D.J. Shin ; H.S. Shin ; I.K. Yun ; J.S. Lee ; Y.K. Oh ; Y.J. Oh
- Source: Electronics Letters, Volume 42, Issue 20, p. 1172 –1173
- DOI: 10.1049/el:20061801
- Type: Article
- + Show details - Hide details
-
p.
1172
–1173
(2)
A 50 GHz-spaced spectrum-slicing wavelength division multiplexed (WDM) passive optical network (PON) employing uncooled RSOA is presented. 32-channel coverage and colourless operation over 90°C temperature range are demonstrated at 155 Mbit/s. - Author(s): C.-H. Chang ; P. Kourtessis ; J.M. Senior
- Source: Electronics Letters, Volume 42, Issue 20, p. 1173 –1175
- DOI: 10.1049/el:20062326
- Type: Article
- + Show details - Hide details
-
p.
1173
–1175
(3)
A dynamic bandwidth assignment protocol is proposed that demonstrates impartial and highly efficient bandwidth arrangement for gigabit-capable passive optical networks. In particular the novel algorithm automatically modifies the assigned bandwidth per optical network unit to support quality of service and service level agreement according to maximum network capacity and users' queuing status. Network simulation results have demonstrated superior mean packet delay performance achieving a tenfold reduction of packet delay at high network load when compared to other dynamic bandwidth assignment algorithms. - Author(s): T. Pfau ; S. Hoffmann ; R. Peveling ; S. Ibrahim ; O. Adamczyk ; M. Porrmann ; S. Bhandare ; R. Noé ; Y. Achiam
- Source: Electronics Letters, Volume 42, Issue 20, p. 1175 –1176
- DOI: 10.1049/el:20062108
- Type: Article
- + Show details - Hide details
-
p.
1175
–1176
(2)
In a coherent and synchronous QPSK system with real-time data recovery and standard DFB lasers a data throughput of 1.6 Gbit/s is achieved, faster than ever reported. After 63 km of fibre the BER is well below the FEC threshold.
All-optical correlation employing single logic XOR gate with feedback
Demonstration of WDM-PON with 50 GHz channel spacing employing spectrum-sliced reflective semiconductor optical amplifiers
GPON service level agreement based dynamic bandwidth assignment protocol
Synchronous QPSK transmission at 1.6 Gbit/s with standard DFB lasers and real-time digital receiver
-
- Author(s): K. Shiba ; T. Nakata ; T. Takeuchi ; T. Sasaki ; K. Makita
- Source: Electronics Letters, Volume 42, Issue 20, p. 1177 –1178
- DOI: 10.1049/el:20061700
- Type: Article
- + Show details - Hide details
-
p.
1177
–1178
(2)
An asymmetric waveguide avalanche photodiode (APD) has been developed. Asymmetric waveguide structures are effective for achieving robustness under high input power operations, and high quantum efficiencies of 94% for 1.55 µm and 90% for 1.31 µm were achieved. A gain–bandwidth product of 110 GHz and a maximum 3 dB-down bandwidth of 20 GHz were also achieved. A high receiver sensitivity of −30.2 dBm at 10 Gbit/s for a receiver module with integrated TIA has also been demonstrated.
10 Gbit/s asymmetric waveguide APD with high sensitivity of −30 dBm
-
- Author(s): T.-W. Kim ; D.-H. Kim ; S.-H. Shin ; S.-J. Jo ; J.H. Jang ; J.-I. Song
- Source: Electronics Letters, Volume 42, Issue 20, p. 1178 –1180
- DOI: 10.1049/el:20062431
- Type: Article
- + Show details - Hide details
-
p.
1178
–1180
(3)
Characteristics of 0.2 µm depletion mode (D) and quasi-enhancement mode (QE) capless InAlAs/InGaAs p-HEMTs having a self-aligned gate (SAG) are reported. The QE SAG capless p-HEMT showed improved output conductance and sub-threshold characteristics owing to the increased gate-to-channel aspect ratio implemented by using a buried Pt technology. The maximum gm, ION/IOFF, sub-threshold slope, fT, and fmax of the QE SAG capless p-HEMT were 1.22 S/mm, 2.11×105, 65 mV/dec, 210 GHz and 250 GHz, and those of the D SAG capless p-HEMT were 1.12 S/mm, 1.27×104, 78 mV/dec, 185 GHz and 225 GHz. The QE SAG capless p-HEMT also exhibited a shorter drain delay time than the D SAG capless p-HEMT by about 46%. - Author(s): J.-S. Rieh ; M. Khater ; A. Jeseph ; G. Freeman ; D. Ahlgren
- Source: Electronics Letters, Volume 42, Issue 20, p. 1180 –1181
- DOI: 10.1049/el:20061645
- Type: Article
- + Show details - Hide details
-
p.
1180
–1181
(2)
The effect of collector lateral scaling on the performance of 300 GHz-level SiGe HBTs is investigated. Peak fT and fmax exhibited an initial improvement followed by a degradation with decreasing collector width. Possible causes behind the observed trend are discussed in terms of RC delay and the Kirk effect. - Author(s): S. Chakrabarti ; B. Doggett ; R. O'Haire ; E. McGlynn ; M.O. Henry ; A. Meaney ; J.-P. Mosnier
- Source: Electronics Letters, Volume 42, Issue 20, p. 1181 –1183
- DOI: 10.1049/el:20062161
- Type: Article
- + Show details - Hide details
-
p.
1181
–1183
(3)
Nitrogen-doped ZnO thin films were deposited using the pulsed laser deposition technique. The epitaxial ZnO films were p-type in the measured temperature range 200–450 K, with hole concentrations and mobilities of 9.6×1015 cm−3 and 10.8 cm2/V-s, respectively, at room temperature. The films remained p-type under conditions of changing illumination. This result represents a step towards realisation of ZnO-based optoelectronic devices for high-temperature operation.
Characteristics of 0.2 µm depletion and quasi-enhancement mode self-aligned gate capless p-HEMTs
Effect of collector lateral scaling on performance of high-speed SiGe HBTs with fT>300 GHz
p-type conduction above room temperature in nitrogen-doped ZnO thin film grown by plasma-assisted pulsed laser deposition
-
- Author(s): P. Ragothaman ; T. Yang ; W.B. Mikhael ; R.R. Muise ; A. Mahalanobis
- Source: Electronics Letters, Volume 42, Issue 20, p. 1183 –1184
- DOI: 10.1049/el:20061641
- Type: Article
- + Show details - Hide details
-
p.
1183
–1184
(2)
Automatic target recognition using quadratic correlation filters has been reported recently. It requires the eigenvalue decomposition (EVD) of a large matrix computed using the autocorrelation matrices of target and clutter training images. In practice, situations arise where new images need to be incorporated, which perturbs the EVD. Proposed is a novel computationally efficient method to obtain the new EVD adaptively. Sample results using an infrared dataset illustrate the effectiveness of the technique. - Author(s): R. Conway
- Source: Electronics Letters, Volume 42, Issue 20, p. 1185 –1186
- DOI: 10.1049/el:20062230
- Type: Article
- + Show details - Hide details
-
p.
1185
–1186
(2)
An approach for reducing the complexity of the multiplier block for fixed coefficient FIR filters using the transpose structure is presented. Through the use of modular arithmetic with moduli of the type 2n±1 and 2n, modulo multiplier blocks with a small full adder count are obtained using a minimum spanning tree algorithm. The results obtained show a very significant reduction in the filter complexity relative to existing techniques. A unique feature of the results is that the complexity is independent of filter length, but a function of the filter's dynamic range.
Efficient adaptive subspace tracking algorithm for automatic target recognition
Reducing complexity of fixed-coefficient FIR filters
-
- Author(s): S.Y. Low ; S. Nordholm ; K.L. Teo
- Source: Electronics Letters, Volume 42, Issue 20, p. 1186 –1187
- DOI: 10.1049/el:20061858
- Type: Article
- + Show details - Hide details
-
p.
1186
–1187
(2)
An efficient bi-criteria optimisation method is proposed for joint optimisation of noise suppression and target signal distortion levels in microphone array applications. This approach utilises scalarisation in conjunction with a curve fitting method to find the efficient frontier, which allows for engineering judgement in obtaining the desired trade-off in the solution.
Use of efficient frontier in microphone arrays
-
- Author(s): J.M. Pitts ; X. Wang ; Q. Yang ; J.A. Schormans
- Source: Electronics Letters, Volume 42, Issue 20, p. 1188 –1189
- DOI: 10.1049/el:20061594
- Type: Article
- + Show details - Hide details
-
p.
1188
–1189
(2)
Random early detection (RED) was developed to improve the congestion avoidance behaviour of TCP/IP traffic, but can also benefit real-time interactive applications. A novel solution is developed for a RED controlled buffer, modelled as an M/M/1 queue. This gives explicit formulas relating load, performance, and RED configuration parameters. Results for VoIP demonstrate that RED regulates the mean delay and delay variation under congested conditions, and that the new analysis accurately bounds performance. - Author(s): U.-K. Kwon and G.-H. Im
- Source: Electronics Letters, Volume 42, Issue 20, p. 1189 –1191
- DOI: 10.1049/el:20062088
- Type: Article
- + Show details - Hide details
-
p.
1189
–1191
(3)
A technique called iterative amplitude reconstruction (IAR) is proposed for recovering the clipped orthogonal frequency-division multiplexing (OFDM) signals, where optimum equaliser tap coefficients are obtained under the MMSE criterion. The proposed IAR effectively recovers the contaminated OFDM signals, approaching the nonclipped system at the high SNR range.
Excess-rate queuing theory for M/M/1/RED with application to VoIP QoS
Iterative amplitude reconstruction of clipped OFDM signals with optimum equalisation
Most viewed content for this Journal
Article
content/journals/el
Journal
5
Most cited content for this Journal
-
Extreme multistability in a memristive circuit
- Author(s): Bo-Cheng Bao ; Quan Xu ; Han Bao ; Mo Chen
- Type: Article
-
Absorptive frequency selective surface using parallel LC resonance
- Author(s): Qiang Chen ; Liguo Liu ; Liang Chen ; Jiajun Bai ; Yunqi Fu
- Type: Article
-
Partial spectral search-based DOA estimation method for co-prime linear arrays
- Author(s): Fenggang Sun ; Peng Lan ; Bin Gao
- Type: Article
-
Experimental verification of on-chip CMOS fractional-order capacitor emulators
- Author(s): G. Tsirimokou ; C. Psychalinos ; A.S. Elwakil ; K.N. Salama
- Type: Article
-
54 Gbit/s OOK transmission using single-mode VCSEL up to 2.2 km MMF
- Author(s): G. Stepniak ; A. Lewandowski ; J.R. Kropp ; N.N. Ledentsov ; V.A. Shchukin ; N. Ledentsov Jr. ; G. Schaefer ; M. Agustin ; J.P. Turkiewicz
- Type: Article