By Topic

# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 54
• ### CMOS multiple input voltage winner takes all circuit

Publication Year: 1995, Page(s):1915 - 1916
Cited by:  Papers (4)
| | PDF (188 KB)

A new kind of multiple input voltages winner takes all circuit, made with only MOS transistors is presented. Simulation and experimental results have shown that the new structure offers low power consumption combined with excellent frequency response View full abstract»

• ### Determination of minimum number of wavelengths required for all-optical WDM networks using graph colouring

Publication Year: 1995, Page(s):1895 - 1897
Cited by:  Papers (2)
| | PDF (348 KB)

The minimum number of carrier wavelengths required for full interconnection of a wavelength-routed optical fibre network was determined using the graph colouring of a shortest-path graph'. derived from the original network description. No two messages with the same carrier wavelength and different source/destination pass over the same communication link, and all sources connect to all possible de... View full abstract»

• ### Etching processes for optoelectronic devices employing periodic multilayers of InGaAs/InAlAs

Publication Year: 1995, Page(s):1948 - 1950
| | PDF (440 KB)

Nonselective reactive ion beam etching (RIBE) using Cl2/Ar mixtures at elevated temperatures and two isotropic wet chemistries (HCl/HNO3/H2O2 and HCl/H2O2/H2O) have been developed for fabricating 1.3 mμ optical transmission modulators employing periodic multilayers of InGaAs/InAlAs View full abstract»

• ### Monolithic GaAs MESFET power sensor microsystem

Publication Year: 1995, Page(s):1914 - 1915
Cited by:  Papers (6)
| | PDF (212 KB)

The authors present the principle, technology and properties of a novel power sensor microsystem designed for very precise power measurement in a broad frequency range. Bulk micromachining technology on GaAs was implemented to obtain the desired parameters of the sensor View full abstract»

• ### Cluster analysis preprocessor for path loss modelling using neural networks

Publication Year: 1995, Page(s):1894 - 1895
| | PDF (252 KB)

The neural networks technique is applied to model path loss of indoor radio propagation. Cluster analysis is employed as a preprocessor to simplify the characterisation of the complicated indoor environment. Simulation results demonstrate that this method is feasible, resulting in a substantial reduction of data input requirement View full abstract»

• ### Parallel coupled microstrip filter with phase difference compensation

Publication Year: 1995, Page(s):1927 - 1928
Cited by:  Papers (8)
| | PDF (232 KB)

A new improved design for coupled microstrip filters is proposed. The method is based on a new structure which replaces conventional quarter-wavelength coupled lines. The improvement is achieved by reducing effects due to the difference between the phase velocities of the two normal modes propagated on two symmetric coupled lines. This possibility is demonstrated on a basic cell with the help of a... View full abstract»

• ### Benign mechanism giving rise to kinks in GaAs MESFET and HEMT I(V) characteristics

Publication Year: 1995, Page(s):1947 - 1948
Cited by:  Papers (1)
| | PDF (268 KB)

Kinks in GaAs MESFET and HEMT I(V) characteristics may arise from a change in the depletion layer dimensions caused by redistribution of the two-dimensional electric field when the space-charge layer reaches the drain-side recess edge. The mechanism is benign in that it does not question material quality and growth View full abstract»

• ### Resistive network implementing maps of Gabor functions of any phase

Publication Year: 1995, Page(s):1913 - 1914
Cited by:  Papers (8)  |  Patents (1)
| | PDF (248 KB)

Image-acquisition and processing systems based on resistive networks are well known and useful for sensory applications. The author presents a resistive network able to evaluate, at each node, convolutions with Gabor functions of any phase. The network is useful for motion detection, depth perception and texture segregation. Stability with respect to VLSI implementation approximations is discussed View full abstract»

• ### Bit-serial Berlekamp-like multipliers for GF(2m)

Publication Year: 1995, Page(s):1893 - 1894
| | PDF (232 KB)

A bit-serial multiplier for GF(2m) is presented. This multiplier operates in a similar way to the traditional Berlekamp multiplier and has the same hardware requirements. However the format of the inputs to the proposed multiplier is different, and in some circumstances constant multipliers based on this approach can be clocked faster than those based on the traditional Berlekamp multip... View full abstract»

• ### Temperature-insensitive vertical-cavity surface-emitting laser array with a broad gain bandwidth

Publication Year: 1995, Page(s):1925 - 1927
Cited by:  Papers (3)  |  Patents (1)
| | PDF (360 KB)

Temperature-insensitive vertical-cavity surface-emitting lasers (VCSELs) are promising devices for low-cost optical interconnection. The authors measured the injection current at a threshold and light output power of 1 mW at temperatures of 20, 50 and 80°C. At 80°C and 1 mW, the driving current for VCSELs with a broad gain bandwidth was reduced by ~20%, compared with that for conventional ... View full abstract»

• ### Amplitude modulation at radio frequencies using a four-terminal ballistic electron device

Publication Year: 1995, Page(s):1945 - 1947
| | PDF (356 KB)

The authors demonstrate that the gross nonlinearities in the IV characteristics of a mesoscopic cross at 4.2 K may be used to demodulate signals at radio frequencies with high efficiency and low distortion. The device has a relatively low impedance and the results are reproducible from device to device View full abstract»

• ### Finite bipolarised arrays: effect of parasitic elements in mutual coupling

Publication Year: 1995, Page(s):1888 - 1889
| | PDF (272 KB)

An element by element method of mutual impedance correction is used to take into account the parasitic element effects. It assumes that the elements are characterised by a single radiation mode. The method is then extended to bipolarised arrays and validated experimentally View full abstract»

• ### Reconstruction of character skeletons using Gabor filter features

Publication Year: 1995, Page(s):1911 - 1912
Cited by:  Papers (3)
| | PDF (244 KB)

Features derived from Gabor wavelet filters are used to reconstruct the skeletons of handwritten digits. The features are linked into strokes which are suitable as input to character recognisers. Experimental results are given to show the effectiveness of the stroke-linking algorithm as a thinning method, producing well-connected skeletons for broken and noisy digits View full abstract»

• ### Anisotropic ECR etching of benzocyclobutene

Publication Year: 1995, Page(s):1919 - 1921
Cited by:  Papers (2)
| | PDF (392 KB)

Anisotropic, high rate etching of benzocyclobutene (BCB) with smooth surfaces and sidewalls has been achieved in a SF6/O 2/Ar electron cyclotron resonance (ECR)-generated plasma. BCB sidewall profiles, etch rates, and selectivity to photoresist are evaluated against SF6:O2 ratio, pressure, microwave power, and RF power View full abstract»

• ### Microwave plasma grown oxynitride using nitrous oxide

Publication Year: 1995, Page(s):1953 - 1954
Cited by:  Papers (1)
| | PDF (236 KB)

The microwave N2O plasma oxidation of Si(100) at low temperature (<200°C) is reported. The presence of nitrogen slightly inside the SiO2 layer has been observed by X-ray photoelectron spectroscopy (XPS). Electrical and interfacial properties are also discussed View full abstract»

• ### Analysis of MC (moving ceiling) scheme

Publication Year: 1995, Page(s):1892 - 1893
| | PDF (232 KB)

The MC scheme is considered to be a promising policing scheme due to its excellent mean rate policing capability. The authors present several numerical equations useful for analysing this scheme View full abstract»

• ### Single-frequency erbium fibre ring laser with intracavity phase-shifted fibre Bragg grating narrowband filter

Publication Year: 1995, Page(s):1924 - 1925
Cited by:  Papers (5)  |  Patents (3)
| | PDF (244 KB)

The authors report a single-frequency unidirectional erbium fibre ring laser operating at 1.55 μm which uses an intracavity phase-shifted fibre Bragg grating as an ultranarrow frequency bandpass filter. The linewidth of the laser was measured to be <2.0 kHz View full abstract»

• ### Subsurface CW interference radar

Publication Year: 1995, Page(s):1944 - 1945
| | PDF (224 KB)

A new subsurface CW (continuous wave) interference radar having the great advantage of detecting a fine shallow target is presented. The horizontal location of the target submerged in a dissipative half-space may be detected easily by using the symmetry of the measured electric field pattern. A simple relationship between the field pattern and the depth of the target is derived and confirmed with ... View full abstract»

• ### Effect of thermal treatment on Rayleigh scattering in silica-based glasses

Publication Year: 1995, Page(s):1940 - 1941
Cited by:  Papers (3)
| | PDF (228 KB)

The effect of thermal treatment on Rayleigh scattering in silica-based glasses is investigated experimentally. Two types of sample glasses, such as annealed samples' and `reheated samples', were prepared by the VAD method with different types of thermal treatment. The authors found that the Rayleigh scattering coefficient of the reheated samples was 5~10% greater than that of the annealed samples... View full abstract»

• ### Single-loop delta-sigma modulator with swing suppression

Publication Year: 1995, Page(s):1886 - 1887
Cited by:  Papers (3)
| | PDF (196 KB)

A single-loop higher-order delta-sigma modulator with a new loop topology is presented. The loop-filter is composed of both feedback and feedforward paths. No active summing element is required in the modulator implementation. The modulator has low integrator output swings and a high input dynamic range, resulting in relaxed op-amp requirements even for low-voltage operation. Simulation results of... View full abstract»

• ### Nearest-neighbour multichannel filter

Publication Year: 1995, Page(s):1910 - 1911
Cited by:  Papers (15)
| | PDF (280 KB)

The authors address the problem of noise attenuation for multichannel data. The proposed filter utilises adaptively determined data dependent coefficients. The special case of colour image processing is studied as an important example of multichannel signal processing View full abstract»

• ### Fibre optical parametric amplifier operating near zero-dispersion wavelength

Publication Year: 1995, Page(s):1935 - 1937
Cited by:  Papers (6)  |  Patents (5)
| | PDF (356 KB)

The authors have investigated the gain characteristics of a fibre-optical parametric amplifier operating near zero-dispersion wavelength. The gain spectrum is very sensitive to the difference between the pump and zero-dispersion wavelengths. A gain of 12 dB and an output saturation power of 8.4 dBm have been demonstrated with a pump power of 180 mW View full abstract»

• ### Sensitivity-based CMOS VLSI circuit performance optimisation

Publication Year: 1995, Page(s):1918 - 1919
| | PDF (272 KB)

Sensitivity models are presented for propagation delay and average power dissipation which provide low-cost and accurate differential performance information not previously available. A sensitivity-based optimisation technique is compared with a formal mathematical optimisation technique and the results demonstrate that accurate VLSI circuit performance optimisation is now feasible View full abstract»

• ### Generalised Rice-lognormal channel model for wireless communications

Publication Year: 1995, Page(s):1899 - 1900
Cited by:  Papers (14)
| | PDF (228 KB)

The Rice-lognormal (RLN) channel model is generalised to include an additive diffuse-multipath component having constant average power. The generalised RLN (GRLN) model includes as limiting cases many well-known narrowband models, e.g. Rayleigh, Rice, lognormal and Loo. The GRLN probability density functions of both envelope and phase are evaluated View full abstract»

• ### Low-frequency dispersion characteristics of GaN HFETs

Publication Year: 1995, Page(s):1951 - 1952
Cited by:  Papers (16)  |  Patents (2)
| | PDF (232 KB)

The low-frequency transconductance and output resistance of AlN/GaN HFETs have been examined as functions of temperature. Dispersive characteristics were found which are indicative of trapping activity in the GaN channel layer. Traps with an activation energy near 1 eV were evident 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