Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 37, Issue 17, 16 August 2001
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Volume 37, Issue 17
16 August 2001
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- Author(s): W. Menzel ; M. Al-Tikriti ; M.B. Espadas Lopez
- Source: Electronics Letters, Volume 37, Issue 17, p. 1059 –1060
- DOI: 10.1049/el:20010739
- Type: Article
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The combination of a microstrip patch antenna at 900 MHz and a folded reflector antenna in the 60 GHz frequency range integrated in a common aperture is described. The 60 GHz antenna radiates through a grid integrated in the patch of the microstrip antenna. - Author(s): G. Tuccari ; S. Buttaccio ; G. Nicotra
- Source: Electronics Letters, Volume 37, Issue 17, p. 1060 –1062
- DOI: 10.1049/el:20010727
- Type: Article
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Holographic measurements to determine deviations of the 32 m Noto antenna with respect to an ideal parabolic surface have been performed at 11.5 GHz. An ‘ad hoc’ system including a reference secondary antenna was built, and digital beacons coming from commercial TV satellites were used as signal sources. Results clearly showed significant deformations of the dish.
Common aperture, dual frequency printed antenna (900 MHz and 60 GHz)
Phase reference holography of the Noto 32 m VLBI antenna
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- Author(s): O. Calvo ; C.R. Mirasso ; R. Toral
- Source: Electronics Letters, Volume 37, Issue 17, p. 1062 –1063
- DOI: 10.1049/el:20010735
- Type: Article
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It is experimentally demonstrated that a chaotic electronic circuit exhibits the main features of coherence resonance. This phenomenon shows up as a quasi-periodic response when the circuit is subjected to an external white-noise source of the appropriate level. - Author(s): C.C. Wu and C.M. Young
- Source: Electronics Letters, Volume 37, Issue 17, p. 1063 –1064
- DOI: 10.1049/el:20010721
- Type: Article
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A simple implementation of the average-current-mode control technique for a single-phase boost power-factor pre-regulator is presented to give good line current correction. The controller avoids use of a multiplier, a sample-and-hold circuit, and a line voltage sensor. It provides an effective solution when a low-cost control circuit is required. - Author(s): M.P. Foster ; H.I. Sewell ; C.M. Bingham ; D.A. Stone
- Source: Electronics Letters, Volume 37, Issue 17, p. 1065 –1066
- DOI: 10.1049/el:20010736
- Type: Article
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A state-variable model for third-order leadless chip carrier (LCC) voltage-output resonant converters has been derived. This is demonstrated to be at least 40 times faster to simulate than an ‘equivalent’ SPICE simulation of the circuit. Comparison of simulation results with those from an experimental resonant converter show that accuracy commensurate with SPICE simulations is obtained.
Coherence resonance in chaotic electronic circuits
Simplified control technique for unity-power-factor boost pre-regulator
State-variable modelling of LCC voltage-output resonant converters
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- Author(s): P.K. Petrov and N.McN. Alford
- Source: Electronics Letters, Volume 37, Issue 17, p. 1066 –1067
- DOI: 10.1049/el:20010731
- Type: Article
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A method for electrical tuning of a dielectric resonator using a BaxSr(1-x)TiO3 thick film grown on a metal substrate is described. The results show that by incorporating a ferroelectric element, fast resonant frequency tuning of a dielectric resonator, while maintaining a useful Q-factor, is possible.
Tunable dielectric resonator with ferroelectric element
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- Author(s): P. Celinski ; J.F. López ; S. Al-Sarawi ; D. Abbott
- Source: Electronics Letters, Volume 37, Issue 17, p. 1067 –1069
- DOI: 10.1049/el:20010742
- Type: Article
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A new implementation of a threshold gate based on a capacitive input, charge recycling differential sense amplifier latch is presented. Simulation results indicate that the proposed structure has very low power dissipation and high operating speed, as well as robustness under process, temperature and supply voltage variations, and is therefore highly suitable as an element in digital integrated circuit design.
Low power, high speed, charge recycling CMOS threshold logic gate
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- Author(s): V.M. Schneider
- Source: Electronics Letters, Volume 37, Issue 17, p. 1069 –1070
- DOI: 10.1049/el:20010732
- Type: Article
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Several experimental high dispersion and dispersion slope fibres are measured for their temperature dependence. Supermode resonant coupling is responsible for an interesting trend in the dispersion and dispersion slope variation with temperature.
Effects of temperature on dispersion of high slope dispersion compensating fibres
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- Author(s): L.-H. Hsieh and K. Chang
- Source: Electronics Letters, Volume 37, Issue 17, p. 1070 –1071
- DOI: 10.1049/el:20010730
- Type: Article
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A compact Chebyshev-function bandpass filter using dual-mode patch resonators is proposed. The filter presents 75% size reduction compared with the conventional Chebyshev bandpass filter using two square patch resonators. Because of inset feeding and only one coupling gap being required, the new filters can achieve a low insertion loss of 1.1 dB and reduce the fabrication uncertainties. - Author(s): A.-S. Saleh and H. Aubert
- Source: Electronics Letters, Volume 37, Issue 17, p. 1071 –1073
- DOI: 10.1049/el:20010737
- Type: Article
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The transmission spectrum of self-similar multilayered structures exhibits sharp peaks within forbidden frequency bandgaps. Here, advantage is taken of this property to design selective microwave filters. For this purpose self-similar multi-slab media with variable lacunarity (i.e. variable distribution of gap sizes) are inserted in a metallic waveguide.
Compact size and low insertion loss Chebyshev-function bandpass filters using dual-mode patch resonators
Self-similar multi-slab media with variable lacunarity for design of selective microwave filters
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- Author(s): E. Biglieri and A.M. Tulino
- Source: Electronics Letters, Volume 37, Issue 17, p. 1073 –1074
- DOI: 10.1049/el:20010722
- Type: Article
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It is shown that when the number of receiving antennas is large, space-time codes designed under a Euclidean-distance criterion are also good for quasi-static Rayleigh fading channels. - Author(s): Jun Lee and Jaejin Lee
- Source: Electronics Letters, Volume 37, Issue 17, p. 1074 –1075
- DOI: 10.1049/el:20010745
- Type: Article
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A construction method of error correcting run-length limited (EC-RLL) codes using a high rate recursive systematic code (RSC) or turbo code for storage systems is proposed. The EC-RLL codes can be constructed by a concatenating conventional modulation code and RSC or turbo code with puncturing. The benefit of the scheme is the utilisation of soft decision and iterative detection algorithms for decoding. - Author(s): Chan-Soo Hwang
- Source: Electronics Letters, Volume 37, Issue 17, p. 1075 –1077
- DOI: 10.1049/el:20010719
- Type: Article
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A method to reduce the peak-to-average power ratio (PAR) of multicarrier signals has been developed. The method enlarges the quadrature amplitude modulation (QAM) constellation size at tones so that several signal points represent the same information. It chooses a signal point among equivalent signal points that minimises PAR. The method achieved more than 4 dB PAR reduction in a 64-subcarrier system.
Designing space-time codes for large number of receiving antennas
Error correcting RLL codes using high rate RSC or turbo code
Peak power reduction method for multicarrier transmission
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- Author(s): T. Hori ; N. Nishizawa ; M. Yoshida ; T. Goto
- Source: Electronics Letters, Volume 37, Issue 17, p. 1077 –1078
- DOI: 10.1049/el:20010743
- Type: Article
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A novel cross-correlation measurement system without mechanical action has been demonstrated in which the delay time between the reference and signal pulse can be electronically scanned by utilising the soliton self-frequency shift and the chromatic dispersion in the optical fibre. In this system, the reference pulse is the ideal femtosecond soliton pulse. The scanning range, the resolution, and the scanning speed of the delay time can be arbitrarily changed only by the electronic control. - Author(s): B. Lunitz ; J. Guttmann ; H.-P. Huber ; J. Moisel ; M. Rode
- Source: Electronics Letters, Volume 37, Issue 17, page: 1079 –1079
- DOI: 10.1049/el:20010726
- Type: Article
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p.
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An optical backplane for high-speed data transmission was experimentally examined. The transmission of 2.5 Gbit/s per channel over a 1 m multimode polymer waveguide is demonstrated.
Cross-correlation measurement without mechanical delay scanning using electronically controlled wavelength-tunable femtosecond soliton pulse
Experimental demonstration of 2.5 Gbit/s transmission with 1 m polymer optical backplane
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- Author(s): F. Yan ; Y. Luo ; J.H. Zhao ; M. Bush ; G.H. Olsen ; M. Weiner
- Source: Electronics Letters, Volume 37, Issue 17, p. 1080 –1081
- DOI: 10.1049/el:20010720
- Type: Article
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4H-SiC avalanche photodiodes (APDs) are fabricated with a multistep junction termination extension. The leakage current density has been dramatically reduced to as low as 1 µA/cm2 and photo-responsivity up to 105 A/W has been achieved. The 4H-SiC APDs can run very stably at power densities up to 104 W/cm2.
4H-SiC avalanche photodiode with multistep junction extension termination
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- Author(s): P.A. Hiskett ; J.M. Smith ; G.S. Buller ; P.D. Townsend
- Source: Electronics Letters, Volume 37, Issue 17, p. 1081 –1083
- DOI: 10.1049/el:20010734
- Type: Article
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The photon-counting performance of commercially available InGaAs/InP avalanche photodiodes operated in Geiger mode was investigated at temperatures between 77 and 260 K. In particular, their noise equivalent power was measured to be 4 × 10-17 WHz-1/2 at 77 K. The implications of these results in the context of a quantum cryptography application are discussed.
Low-noise single-photon detection at wavelength 1.55 µm
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- Author(s): A. Reigber
- Source: Electronics Letters, Volume 37, Issue 17, p. 1083 –1084
- DOI: 10.1049/el:20010724
- Type: Article
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The main limitation for a wider applicability of airborne repeat-pass interferometric SAR data is the presence of small uncompensated motion errors. The effect of residual motion compensation errors is addressed and a new technique to minimise their influence on the interferometric phase is proposed.
Correction of residual motion errors in airborne SAR interferometry
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- Author(s): Yong Huat Chew ; Ronghong Mo ; Chi Chung Ko
- Source: Electronics Letters, Volume 37, Issue 17, p. 1084 –1086
- DOI: 10.1049/el:20010747
- Type: Article
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An approach for obtaining channel capacity when rate adaptive transmitters with co-ordination among all users are time sharing flat fading channels for transmission is presented. This channel capacity is obtained when only the mobile that observes the best channel condition is assigned to transmit at any time. Channel capacity in general gamma fading channels is computed. - Author(s): J.K.L. Wong ; M.J. Neve ; K.W. Sowerby
- Source: Electronics Letters, Volume 37, Issue 17, p. 1086 –1087
- DOI: 10.1049/el:20010749
- Type: Article
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A simple but effective base station (BS) placement strategy for use in interference limited code division multiple access (CDMA) systems is proposed. Unlike more commonly applied combinatorial optimisation techniques, the proposed strategy uses linear programming. Since the algorithm is deterministic, an optimal solution is guaranteed. It is shown that this strategy could have application in solving ‘real world’ problems. - Author(s): D. Wake ; S. Dupont ; C. Lethien ; J-P. Vilcot ; D. Decoster
- Source: Electronics Letters, Volume 37, Issue 17, p. 1087 –1089
- DOI: 10.1049/el:20010748
- Type: Article
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High frequency, narrowband radio transmission over multimode fibre is shown to be possible with performance comparable to singlemode fibre using low-cost lasers and photodiodes. This allows the use of existing fibre cable infrastructures within buildings for the realisation of cost effective distributed antenna systems.
Channel capacity in time sharing multiple-access flat fading channels employing variable rate M-QAM transmitter
Optimisation strategy for wireless communications system planning using linear programming
Radiofrequency transmission of 32-QAM signals over multimode fibre for distributed antenna system applications
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- Author(s): M. Enciso ; F. Aniel ; P. Crozat ; R. Adde ; M. Zeuner ; A. Fox ; T. Hackbarth
- Source: Electronics Letters, Volume 37, Issue 17, p. 1089 –1090
- DOI: 10.1049/el:20010708
- Type: Article
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RF and microwave noise performances of strained Si/Si0.58Ge0.42n-MODFETs are presented for the first time. The 0.13 µm gate devices have de-embedded fT = 49 GHz, fmax = 70 GHz and a record intrinsic gm = 700 mS/mm. A de-embedded minimum noise figure NFmin = 0.3 dB with a 41 Ω noise resistance Rn and a 19 dB associated gain Gass are obtained at 2.5 GHz, while NFmin = 2.0 dB with Gass = 10 dB at 18 GHz. The noise parameters measured up to 18 GHz and from 10 to 180 mA/mm with high gain and low power dissipation show the potential of SiGe MODFETs for mobile communications. - Author(s): F. Hossein-Babaei and B. Raissi-Dehkordi
- Source: Electronics Letters, Volume 37, Issue 17, p. 1090 –1092
- DOI: 10.1049/el:20010723
- Type: Article
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The electrophoresis of silicon particles in acetone, and the electrophoretic deposition of poly-silicon thick films are reported for the first time. The anodic deposition of Si particles was achieved by applying DC electric fields of ~100 V/cm between two electrodes soaked in a semistable acetone suspension. Uniform layers were reproducibly formed on gold, graphite and silicon wafer anodes (substrates). The technique was successfully applied on substrates of complicated shapes. - Author(s): L.G. Fursin ; J.H. Zhao ; M. Weiner
- Source: Electronics Letters, Volume 37, Issue 17, p. 1092 –1093
- DOI: 10.1049/el:20010738
- Type: Article
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The first demonstration of Ni ohmic contacts to both p+ and n+ 4H-SiC formed by ion implantation is reported. Sample preparation conditions are described and experimental results presented. Specific contact resistances in the range of 10-4 Ωcm2 and 10-6 Ωcm2 for p+ and n+ 4H-SiC, respectively, have been determined by the transfer length method. - Author(s): Hoon-Ju Chung ; Seung-Woo Lee ; Chul-Hi Han
- Source: Electronics Letters, Volume 37, Issue 17, p. 1093 –1095
- DOI: 10.1049/el:20010710
- Type: Article
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A new push-pull analogue buffer for the integrated data driver circuit of polycrystalline silicon (poly-Si) thin-film transistor liquid crystal displays (TFT-LCDs) is proposed. The proposed push-pull analogue buffer is composed of a complementary source follower output stage, a capacitor, and three analogue switches. It has high immunity to the variation of poly-Si TFT characteristics and low power consumption. - Author(s): V. Hoël ; Y. Guhel ; B. Boudart ; C. Gaquière ; J.C. De Jaeger ; H. Lahrèche ; P. Gibart
- Source: Electronics Letters, Volume 37, Issue 17, p. 1095 –1096
- DOI: 10.1049/el:20010740
- Type: Article
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For the first time, to the knowledge of the authors, GaN MESFETs on silicon substrate have been realised using low-pressure metal-organic vapour phase epitaxy. The devices demonstrate good pinch-off voltage and good breakdown voltage characteristics. A maximum extrinsic transconductance of 30 mS/mm was achieved on a 100 * 0.5 µm2 device. At a drain-to-source voltage of 30 V, the drain current density reaches 100 mA/mm at Vgs = 0 V. - Author(s): S. Lee ; H.J. Kim ; M. Urteaga ; S. Krishnan ; Y. Wei ; M. Dahlstrǒm ; M. Rodwell
- Source: Electronics Letters, Volume 37, Issue 17, p. 1096 –1098
- DOI: 10.1049/el:20010728
- Type: Article
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InP/InGaAs/InP double heterojunction bipolar transistors (DHBTs) with fmax = 425 GHz and fτ = 141 GHz using transferred-substrate technology are reported. This is the highest reported fmax for a DHBT. The breakdown voltage BVCEO is 8 V at JC = 5 × 104 A/cm2 and the DC current gain β is 43.
0.3 dB minimum noise figure at 2.5 GHz of 0.13 µm Si/Si0.58Ge0.42 n-MODFETs
Fabrication of poly-Si thick films by electrophoretic deposition
Nickel ohmic contacts to p- and n-type 4H-SiC
Poly-Si TFT push-pull analogue buffer for integrated data drivers of poly-Si TFT-LCDs
Static measurements of GaN MESFETs on (111) Si substrates
Transferred-substrate InP/InGaAs/InP double heterojunction bipolar transistors with fmax = 425 GHz
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- Author(s): G. Mollova and R. Unbehauen
- Source: Electronics Letters, Volume 37, Issue 17, p. 1098 –1099
- DOI: 10.1049/el:20010725
- Type: Article
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New, simple analytic closed-form relations for least-squares design of higher-order differentiators are presented. Using this approach, solving a system of linear equations for fullband differentiators is avoided. Numerical and graphical results are given.
Analytical design of higher-order differentiators using least-squares technique
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- Author(s): Xin Dong and Wu Zhaohui
- Source: Electronics Letters, Volume 37, Issue 17, p. 1099 –1101
- DOI: 10.1049/el:20010741
- Type: Article
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A new classification system for text-independent speaker recognition is presented. This system combines the output probabilities of generative Gaussian mixture models and discriminative classifier support vector machines. The new method is tested on the YOHO database and achieves superior performance.
Speaker recognition using continuous density support vector machines
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- Author(s): H. Köroğlu and Ö. Morgül
- Source: Electronics Letters, Volume 37, Issue 17, p. 1101 –1102
- DOI: 10.1049/el:20010733
- Type: Article
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A stability proof is given for a time-varying repetitive control strategy. It is illustrated by a simulation example that this time varying strategy can be used to improve the transient reponse and stochastic behaviour of the repetitive control system simultaneously.
Time-varying repetitive control for better transient response and stochastic behaviour
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