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# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 51
• ### CMOS current-mode pseudo-exponential function circuit

Publication Year: 2001, Page(s):471 - 472
Cited by:  Papers (28)  |  Patents (1)
| | PDF (233 KB)

A current-mode analogue circuit that implements a pseudo-exponential function is proposed. The design of the circuit is based on Taylor's series approximation, using MOS transistors in the saturation region. The advantage of this circuit is that the output current presents a very low temperature coefficient (TC) and is also immune to the body-effect. Simulation and experimental results show that t... View full abstract»

• ### Simple, low-cost control of unity-power-factor boost pre-regulator

Publication Year: 2001, Page(s):473 - 475
Cited by:  Papers (2)
| | PDF (380 KB)

A simple design for the control circuit of a unity-power-factor boost pre-regulator is presented. The controller operates in continuous conduction mode and avoids the use of an analogue multiplier and the sensing of the line voltage. The proposed circuit is an interesting solution when high-efficiency and low-cost control circuitry are required. View full abstract»

• ### Benefit of Raman amplification in ultra-long-distance 40 Gbit/s-based WDM transmission using dispersion-flattened fibre span

Publication Year: 2001, Page(s):507 - 509
Cited by:  Papers (2)  |  Patents (1)
| | PDF (416 KB)

The optimum configuration for hybrid Raman/EDFA amplification in ultra-long-distance 40 Gbit/s WDM transmission using a dispersion-flattened fibre span is investigated. By optimising the Raman gain, 16/spl times/40 Gbit/s WDM transmission over 2000 km was achieved with 80 km repeater spacing. View full abstract»

• ### High performance C plus Al co-implanted 5000 V 4H-SiC P+iN diode

Publication Year: 2001, Page(s):531 - 533
Cited by:  Papers (1)
| | PDF (300 KB)

Planar C plus Al co-implanted 5000 V PiN diodes with an effective multistep junction termination extension were designed, modelled and fabricated. The diode I-V characteristics measured at different temperatures along with the multistep junction extension termination design dimensions are reported, showing the realisation of a near-perfect edge termination and a record high current density for the... View full abstract»

• ### Gunn instabilities in power HEMTs

Publication Year: 2001, Page(s):530 - 531
Cited by:  Papers (2)
| | PDF (212 KB)

Experimental and theoretical evidence of the formation of transverse' Gunn dipoles in an Al0.23Ga0.77As/In 0.23Ga0.77As delta doped HEMT is presented. Monte Carlo simulations predicted that the dipoles would first cause a sudden reduction in current followed by a gradual upturn. These predictions were in excellent agreement with the experimental observa... View full abstract»

• ### GaN/AlGaN HEMTs operating at 20 GHz with continuous-wave power density >6 W/mm

Publication Year: 2001, Page(s):528 - 530
Cited by:  Papers (20)
| | PDF (316 KB)

MBE-grown GaN/AlGaN HEMTs have been fabricated on a 2° SiC wafer, where the source-drain spacing was 2 μm and the gate length was 0.15 μm. A peak extrinsic transconductance of 350 mS/mm and a maximum drain current density greater than 1.5 A/mm were obtained. Small-signal S-parameter measurement showed fr of 85 GHz and fMAN approaching 140 GHz. At 20 GHz, a continuou... View full abstract»

• ### Electrical effects of SiNx deposition on GaN MESFETs

Publication Year: 2001, Page(s):527 - 528
Cited by:  Papers (3)
| | PDF (248 KB)

The electrical effects of SiNx deposition on GaN MESFETs have been investigated. Significant effects induced from the dielectric coating have been observed depending on the deposition temperature used in the technological process. A power density increase of 30% has been observed after the device passivation performed at 200°C View full abstract»

• ### Design and performance of improved lumped-distributed Wilkinson divider topology

Publication Year: 2001, Page(s):501 - 503
Cited by:  Papers (17)
| | PDF (340 KB)

An improved lumped-distributed planar 3 dB Wilkinson divider is presented. The technique reduces the number of components and via-grounds. An analysis based on ideal transmission lines provides design equations for the proposed Wilkinson divider. The topology gives good results at L-band and uses less than half of the substrate area of the standard topology View full abstract»

• ### BSIM3v3-based varactor model

Publication Year: 2001, Page(s):525 - 527
Cited by:  Papers (7)
| | PDF (364 KB)

A new varactor model based on the BSIM3v3 model (Berkeley short-channel IGFET model) is presented for the first time to model the behaviour of a silicon-based metal-insulator semiconductor varactor under different bias conditions and operating frequencies. The root mean square errors of the S-parameters between the measured and simulated data are less than 2%. The presented varactor model provides... View full abstract»

• ### MOCVD InP/AlGaInAs distributed Bragg reflector for 1.55 μm VCSELs

Publication Year: 2001, Page(s):500 - 501
Cited by:  Papers (4)
| | PDF (252 KB)

A new MOCVD InP/AlGaInAs distributed Bragg reflector for long-wavelength VCSELs is presented. The InP/AlGaInAs system presents a high potential for 1.55 μm VCSELs owing to the combination of its high refractive index contrast (Δn≃0.34) and its low conduction band discontinuity (ΔEc≃150 meV). InP/AlGaInAs mirrors and one half VCSEL (bottom mirror and λ cavity) have b... View full abstract»

• ### Large change rate-adaptive indoor wireless infrared links using variable silence periods

Publication Year: 2001, Page(s):524 - 525
Cited by:  Papers (3)
| | PDF (248 KB)

A new and simple rate-adaptive transmission scheme for indoor unguided optical links is proposed. The scheme is based on the use of variable silence periods. Allowing the increase of the peak average optical power ratio, which is a favourable characteristic in wireless infrared communications using intensity modulation with direct detection View full abstract»

• ### Deep-ridge distributed feedback waveguide for polarisation independent all-optical switching

Publication Year: 2001, Page(s):498 - 499
Cited by:  Papers (1)
| | PDF (236 KB)

Structural birefringence in a deep-ridge distributed feedback (DFB) waveguide for polarisation independent all-optical switching is investigated. The coupling coefficient of the DFB structure is also polarisation independent between the TE and TM modes View full abstract»

• ### Enhanced maximal ratio combining scheme for RAKE receivers in WCDMA mobile terminals

Publication Year: 2001, Page(s):522 - 524
Cited by:  Papers (8)  |  Patents (2)
| | PDF (336 KB)

The author proposes a modified maximal ratio combining (MRC) scheme that is more suitable for RAKE receivers in wideband code division multiple access (WCDMA) mobile terminals than the conventional MRC scheme. This modified MRC scheme is derived analytically assuming unequal noise powers and imperfect channel estimates in different RAKE fingers View full abstract»

• ### CMOS VHF/RF CCO based on active inductors

Publication Year: 2001, Page(s):472 - 473
Cited by:  Papers (27)
| | PDF (196 KB)

A novel CMOS current controlled oscillator (CCO) is proposed. Based on the current-reused active inductors, a differential oscillator has been designed and fabricated. Measurement results show that it has very wide tuning-range and reasonable phase-noise performance View full abstract»

• ### Low-voltage CMOS low-noise amplifier using planar-interleaved transformer

Publication Year: 2001, Page(s):497 - 498
Cited by:  Papers (11)
| | PDF (240 KB)

A low-voltage CMOS low-noise amplifier (LNA) architecture is presented. A planar-interleaved transformer is used to couple the RF signal between cascode transistors in a conventional LNA topology. Based on the modified RF MOS model, a 5.2 GHz CMOS LNA with fully on-chip input/output matching was designed to verify the low-voltage LNA architecture. The measurement results show that it can be operat... View full abstract»

• ### Distance measurement with phase-stable CW radio link using the Chinese remainder theorem

Publication Year: 2001, Page(s):521 - 522
Cited by:  Papers (1)  |  Patents (1)
| | PDF (280 KB)

A system which can simultaneously provide coherent local oscillator (LO) signals and a precise measurement of distance over a radio link by measuring the phase of continuous signals is described. Ambiguities in distance caused by inability to count integral numbers of wavelengths are resolved by the Chinese remainder theorem (CRT). This is the first application of the CRT to counting wavelengths. ... View full abstract»

• ### Improved recovery characteristics of ISFET glucose sensor using electrolysis method

Publication Year: 2001, Page(s):495 - 497
Cited by:  Papers (4)
| | PDF (312 KB)

The hydrogen ions present in an enzyme-immobilised membrane are diminished by hydroxide ions generated by a reduction potential. The recovery time of an ISFET glucose sensor using an electrolysis method has been reduced to <2 min in contrast to the 10 or 20 min required using a conventional method View full abstract»

• ### Full-swing CMOS output driver using on-chip capacitors, with fast rise time and small overshoot

Publication Year: 2001, Page(s):484 - 485
Cited by:  Patents (2)
| | PDF (204 KB)

A full-swing CMOS output driver with a fast rise time and a small overshoot was designed by using a high-order LRC scheme including on-chip capacitors. This high-order scheme eliminates the trade-off limitation between rise time and overshoot of the conventional second-order full-swing CMOS output driver. SPICE simulation using a 0.25 μm 2.5 V CMOS process showed that this output driver worked ... View full abstract»

• ### Position-sensing CVD-diamond-based UV detectors

Publication Year: 2001, Page(s):519 - 520
| | PDF (216 KB)

Free standing CVD-diamond films have been used to realise simple position-sensing detectors for ultraviolet radiation. It is shown that good detection can be achieved by proper design of the contact structure. Owing to the low absorption coefficient of diamond in the blue/near-UV spectral region, a semitransparent' photodetector is also proposed for use in a wide variety of laser-based optical ma... View full abstract»

• ### Motion estimation using low-bit oriented edge image for DCT-based video compression

Publication Year: 2001, Page(s):494 - 495
| | PDF (212 KB)

A novel block-based motion estimation algorithm using a low-bit resolution oriented edge image (LROEI) is proposed. The algorithm produces difference blocks with little texture for DCT coding and enhances the encoding efficiency. Simulation based on a hierarchical subsampling telescope search confirms that the quality of the LROEI is superior to that of luminance image compared with HSTS using an ... View full abstract»

• ### Reduced-complexity design for triple-tunable frequency synthesiser

Publication Year: 2001, Page(s):482 - 484
Cited by:  Papers (1)
| | PDF (344 KB)

A new design method for a triple-tunable type DDFS-driven PLL frequency synthesiser is presented. Since only a phase accumulator is used in the DDFS (direct digital frequency synthesiser), the other parts of the DDFS such as ROM and a D/A converter can be excluded using the proposed method. Therefore, performance improvements are achieved such as circuit simplicity, reduced power consumption and s... View full abstract»

• ### Photovoltaic effect in CdS on flexible substrate

Publication Year: 2001, Page(s):518 - 519
| | PDF (208 KB)

The authors report on the photovoltaic effect in CdS/CuS films deposited on flexible substrates at temperatures close to room temperature from water solutions of complex-salt compounds. The results demonstrate the feasibility of using this material for photovoltaic applications requiring covering of large complex surfaces View full abstract»

• ### Interference detection enabling 2×20 Gbit/s RZ polarisation division multiplex transmission

Publication Year: 2001, Page(s):511 - 512
Cited by:  Papers (4)  |  Patents (2)
| | PDF (248 KB)

Polarisation division multiplexing can double optical fibre capacity. The detection of interchannel interference in a receiver, and its employment as a control signal for polarisation tracking, is described. Transmission over 33 km of dispersion shifted fibre with a 6.25 picosecond polarisation mode dispersion tolerance is demonstrated View full abstract»

• ### Effective algorithm for rolled fingerprint construction

Publication Year: 2001, Page(s):492 - 494
Cited by:  Papers (2)  |  Patents (1)
| | PDF (360 KB)

Fingerprinting is important for automated personal authentication. Rolled fingerprints can provide much more information for recognition than plain-touch fingerprint captured by a live-scanner. An effective algorithm of real-time rolled fingerprint construction via a live-scanner is proposed, which behaved better than both inked fingerprint acquisition and other construction algorithms View full abstract»

• ### Multiple transform domain split vector quantisation

Publication Year: 2001, Page(s):538 - 539
Cited by:  Papers (8)
| | PDF (252 KB)

A novel split vector quantisation scheme where each signal vector is projected into multiple transform domains is proposed. The coder selects codes from the domain that best represents the signal vector. Sample results using one-dimensional speech signals confirm the superior performance of the proposed scheme View full abstract»

## Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

Full Aims & Scope

## Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White