Electronics Letters

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• Polyphase adaptive filter banks for fingerprint image compression

Publication Year: 1998, Page(s):1931 - 1932
Cited by:  Papers (3)
| | PDF (318 KB)

A perfect reconstruction polyphase filter bank structure is presented in which the filters adapt to the changing input conditions. The use of such a filter bank leads to higher compression results for images containing sharp edges such as fingerprint images. View full abstract»

• Backgating' model including self-heating for low-frequency dispersive effects in III-V FETs

Publication Year: 1998, Page(s):1974 - 1976
Cited by:  Papers (13)
| | PDF (380 KB)

A new approach is proposed which takes into account both traps and thermal phenomena for the modelling of deviations between static and dynamic drain current characteristics in III-V field effect transistors. The model is based on the well-known backgating' concept and can easily be identified on the basis of conventional static drain current characteristics and small-signal, low-frequency S para... View full abstract»

• Erratum

Publication Year: 1998, Page(s): 1985
| | PDF (48 KB)

First Page of the Article
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• 55 GHz dynamic frequency divider IC

Publication Year: 1998, Page(s):1973 - 1974
Cited by:  Papers (8)
| | PDF (308 KB)

A divide-by-two dynamic frequency divider based on enhancement and depletion 0.2 μm gate length pseudomorphic AlGaAs/InGaAs HEMTs (fT=68 GHz and 60 GHz) was designed and fabricated. High-speed operation up to 55 GHz has been measured. The circuit is based on source-coupled FET logic and has single-ended input and complementary outputs to ground. The power consumption is 300 mW using ... View full abstract»

• Microwave oscillators using ring resonators operating at higher modes

Publication Year: 1998, Page(s):1952 - 1953
Cited by:  Papers (3)
| | PDF (212 KB)

Filter and oscillator design using loss compensated stripline ring resonators becomes impracticable as the size of the resonators decreases with increasing frequency. The design of a 6 GHz oscillator employing the second tunable mode of a 2 GHz fundamental mode resonator, demonstrating effective mode suppression and realisation using a larger structure, is presented View full abstract»

• Error free 100 Gbit/s wavelength conversion using grating assisted cross-gain modulation in 2 mm long semiconductor amplifier

Publication Year: 1998, Page(s):1958 - 1959
Cited by:  Papers (39)  |  Patents (1)
| | PDF (268 KB)

The authors demonstrate the first error free operation of 100 Gbit/s wavelength conversion employing cross-gain modulation in a semiconductor optical amplifier. A near transform limited non-return-to-zero data stream is generated at the device output View full abstract»

• Job scheduling using fuzzy load balancing in distributed system

Publication Year: 1998, Page(s):1983 - 1985
Cited by:  Papers (5)  |  Patents (2)
| | PDF (284 KB)

The authors present a batch job scheduler for a distributed system which utilises a fuzzy logic algorithm to balance the load on individual processors and maximise the throughput of the overall system. The fuzzy algorithm has been implemented in a production processing environment rather than in simulation only. The power and simplicity of a fuzzy load balancing algorithm incorporated into a batch... View full abstract»

• CMOS buffer sizing for long on-chip interconnects

Publication Year: 1998, Page(s):1937 - 1938
Cited by:  Patents (1)
| | PDF (260 KB)

A novel transistor sizing rule for long interconnect drivers is proposed. It allows true line matching to be achieved, thus either minimising delay or preserving signal integrity, when propagation time along the line becomes significant with respect to signal transition time. In this case the transmission line properties of long interconnects alter the behaviour of the CMOS buffer, forcing transis... View full abstract»

• Hybrid treatment for electromagnetic field computation in multiple regions

Publication Year: 1998, Page(s):1925 - 1926
Cited by:  Papers (7)
| | PDF (208 KB)

The numerical solution of complex electromagnetic problems via heterogeneous solution methods is proposed. This hybrid method is capable of analysing a system of multiple physically-unconnected regions by employing the principle of equivalent sources. The case of multiple sources in the presence of scattering objects is discussed and the results are compared with other available data View full abstract»

• Radar cross-section calculation with marching methods

Publication Year: 1998, Page(s):1971 - 1972
Cited by:  Papers (7)
| | PDF (292 KB)

Two novel marching techniques for radar cross-section calculation of three-dimensional perfectly conducting objects are discussed: the vector parabolic equation and the current marching technique. They provide substantial speed-up since the solution is marched through the computational domain plane by plane instead of treating all the points simultaneously View full abstract»

• Influence of quadratic mobility degradation factor on low frequency noise in MOS transistors

Publication Year: 1998, Page(s):1977 - 1979
Cited by:  Papers (3)
| | PDF (312 KB)

The influence of the quadratic attenuation mobility factor on the low frequency 1/f noise in MOS transistors is investigated. By taking into account the correlated mobility fluctuations, the influence of the surface roughness scattering on the input referred noise under strong inversion is analysed. The quadratic attenuation mobility factor is found to reduce the impact of the mobility fluctuation... View full abstract»

• Population partitioning in genetic algorithms

Publication Year: 1998, Page(s):1928 - 1929
| | PDF (292 KB)

When an optimisation landscape is highly multimodal, even a genetic algorithm can become stuck in local minima. Increasing the population size is one way to ensure that the search space is more comprehensively sampled. But it can be a more efficient use of population members to allow a number of subpopulations to evolve separately and then interbreed with one another. One example of such a multimo... View full abstract»

• Inhomogeneous pumping and increased filamentation threshold of semiconductor lasers by contact profiling

Publication Year: 1998, Page(s):1950 - 1951
Cited by:  Papers (11)  |  Patents (3)
| | PDF (264 KB)

The authors have fabricated inhomogeneously pumped broad area diode lasers using a novel digitated electrical contact pad to smooth the edges of the transverse distribution of injected carriers. Experiments demonstrate the effectiveness of this scheme in increasing the filamentation threshold and reducing near field modulation up to 35 times threshold. The inhomogeneously pumped design has reduced... View full abstract»

• RMS delay spread estimation technique using non-coherent channel measurements

Publication Year: 1998, Page(s):1918 - 1919
Cited by:  Papers (8)  |  Patents (1)
| | PDF (248 KB)

A method is presented for deriving the RMS delay spread from non-coherent wideband channel measurements (measured amplitude transfer functions). A frequency-domain model of the frequency-selective, Rician fading channel is used, allowing a theoretical evaluation of the transfer function's level crossing statistics View full abstract»

• Double-fused 1.5 μm vertical cavity lasers with record high T o of 132 K at room temperature [Al(Ga)As/GaAs]

Publication Year: 1998, Page(s):1947 - 1949
Cited by:  Papers (14)  |  Patents (20)
| | PDF (368 KB)

The authors report record high temperature performance of a novel long wavelength vertical cavity laser using an electron barrier, operating continuous-wave up to 71°C. A record high characteristic temperature (To) of 132 K has been measured over an operating range of -75 to 35°C View full abstract»

• Adaptive dispersion equalisation by detecting dispersion fluctuations using PM-AM conversion

Publication Year: 1998, Page(s):1956 - 1958
Cited by:  Papers (5)  |  Patents (2)
| | PDF (376 KB)

A novel adaptive dispersion equalisation technique that detects and equalises dispersion fluctuations in transmission fibre during data transmission is proposed. This technique first detects dispersion fluctuations in the fibre by using the PM-AM conversion effect at a monitoring wavelength, and then tunes the data wavelength to equalise the fluctuation. This technique was tested by conducting a 4... View full abstract»

• Genetic algorithm simulation approach to determine membership functions of fuzzy traffic controller

Publication Year: 1998, Page(s):1982 - 1983
Cited by:  Papers (2)
| | PDF (280 KB)

A genetic algorithm (GA) is used to determine membership functions in situations where fuzzy traffic control rules are given by human operators. To find membership functions showing good performance, the authors use a simulation approach while conventional methods are used to compute mathematical functions. In the simulation approach, the fitness value of a chromosome is determined by the use of a... View full abstract»

• Phase-only synthesis of continuous linear aperture distribution patterns with asymmetric side lobes

Publication Year: 1998, Page(s):1916 - 1917
Cited by:  Papers (2)
| | PDF (188 KB)

A method for synthesising linear aperture distribution patterns with different side lobe levels (SLLs) on both sides of the main beam is proposed. This phase-only control method was applied to a Taylor distribution as well as to a uniform amplitude distribution and achieved differences in the SLL on both sides of the main beam as great as 23 dB, improving on a previous procedure that had achieved ... View full abstract»

• Improved close-packed helically-twisted fibre arrays

Publication Year: 1998, Page(s):1964 - 1965
Cited by:  Papers (1)
| | PDF (304 KB)

An increase in the effective diameter of an optical fibre when helically twisted is reported. The increase displaces fibres in close packed helically twisted arrays from their ideal lattice positions. From simple geometric arguments an expression for the increase is derived and improved close-packing is achieved by making fibre size corrections View full abstract»

• Low-voltage 32 Msample/s parallel pipelined switched-current ADC

Publication Year: 1998, Page(s):1906 - 1907
Cited by:  Papers (1)
| | PDF (284 KB)

A parallel switched-current A/D converter is presented. Eight time-interleaved switched-current ADCs operating at 4 Msample/s are used to increase the sampling rate. With channel compensation, the measured SFDR is >50 dB at 32 Msample/s with fm=1.13 MHz. The performance of this experimental design is limited by noise and a fixed-pattern timing error that is not removed by the compens... View full abstract»

• Fast calculation of sensitivity distributions in capacitance tomography sensors

Publication Year: 1998, Page(s):1936 - 1937
Cited by:  Papers (7)
| | PDF (248 KB)

A fast method for calculating the sensitivity distributions in capacitance tomography sensors, based on the finite element method, is proposed. By fast generation of the global system matrix and capacitance values, the calculation time is reduced by ~98% View full abstract»

• Tree decomposition strategy for massively parallel game tree searching

Publication Year: 1998, Page(s):1924 - 1925
Cited by:  Papers (1)
| | PDF (268 KB)

A new tree decomposition strategy, EYBWC (enhanced young brothers wait concept), is proposed for two-player control game tree searching on massively parallel machines. Based on the YBWC (young brothers wait concept) which is one of the best existing tree decomposition strategies, this new strategy notably alleviates processor starvation in a massively parallel search by providing much many nodes f... View full abstract»

• Reduction of hot spots in hyperthermia by means of broadband energy transmission

Publication Year: 1998, Page(s):1901 - 1902
Cited by:  Papers (3)
| | PDF (256 KB)

A multi-frequency scheme for annular phased arrays is proposed with the aim of attaining deep and localised heating for hyperthermic treatment of cancers. The concept is investigated using a 520 MHz broadband microwave system including an antenna array of four microstrip spiral applicators. The results of measurements on a heterogeneous saline solution phantom demonstrate the possibility of produc... View full abstract»

• Stimulated emission from as-grown GaN hexagons by selective area growth hydride vapour phase epitaxy

Publication Year: 1998, Page(s):1970 - 1971
Cited by:  Papers (1)
| | PDF (364 KB)

The authors report room temperature stimulated emission from as-grown GaN hexagons by selective area growth hydride vapour phase epitaxy. The threshold for bulk stimulated emission was found to be 3.4 MW/cm2 with an emission linewidth of 1.2 nm View full abstract»

• Interference in DS-CDMA systems with exponentially vanishing autocorrelations: chaos-based spreading is optimal

Publication Year: 1998, Page(s):1911 - 1913
Cited by:  Papers (37)
| | PDF (332 KB)

A novel estimation of the minimum achievable interference in direct sequence-code division multiple access (DS-CDMA) systems is introduced, which holds when spreading sequences with exponentially vanishing autocorrelation are employed. This can be applied to many of the recently proposed improvements to classical maximum-length or Gold sequences, such as chaos-based spreading. Asymptotic, infinite... 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.

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Meet Our Editors

Editors-in-Chief

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

Professor Ian White