# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 64
• ### Improved source resistance in InP-based enhancement-mode HEMTs for high speed digital applications

Publication Year: 1995, Page(s):925 - 927
Cited by:  Papers (4)
| |PDF (264 KB)

A new approach to reducing the source resistance in InP-based InAlAs-InGaAs enhancement-mode HEMTs is developed using Pt-based buried-gate technology. Source resistance as small as 0.2 Ωmm is obtained, which results in an excellent transconductance of 1170 mS/mm for a 0.5 μm long gate enhancement-mode HEMT View full abstract»

• ### Comment on “VCO jitter reduction with bandpass filtering”

Publication Year: 1995
| |PDF (88 KB)

Following publication of the Letter VCO jitter reduction with bandpass filtering', the author received a critique from G.H.S. Rokos, who pointed out several limitations of the approach and observed that the jitter reduction provided by the post-VCO filter would be minimal for multivibrator phase noise produced by a correlated power spectrum. Furthermore, he pointed out that a single transition ph... View full abstract»

• ### Burst-error correcting algorithm for Reed-Solomon codes

Publication Year: 1995, Page(s):848 - 849
Cited by:  Papers (7)  |  Patents (1)
| |PDF (164 KB)

A new decoding algorithm for burst errors in Reed-Solomon codes is given. This algorithm is shown to be more efficient than previously proposed methods View full abstract»

• ### Cell loss recovery method in B-ISDN/ATM networks

Publication Year: 1995, Page(s):849 - 851
Cited by:  Papers (7)  |  Patents (1)
| |PDF (236 KB)

Presents a method to recover the consecutive cell losses due to buffer overflow in high-speed networks such as B-ISDN. The method is based on forward error correction (FEC) transmission of parity cells, and used by the decoder at the receiving side to reconstruct lost cells, together with data cells at the sending side. It recovers up to 18 consecutive cell losses in ATM networks. The missing cell... View full abstract»

• ### Searching for the best linear approximation of DES-like cryptosystems

Publication Year: 1995, Page(s):873 - 874
| |PDF (172 KB)

The authors show that the problem of searching for the best characteristic in linear cryptanalysis is equivalent to searching for the maximal weight path in a directed graph. Under certain restrictions, the best characteristic can be easily obtained even on a personal computer View full abstract»

• ### Ciphering hardware for high-speed digital networks: a REDOC III implementation

Publication Year: 1995, Page(s):851 - 852
| |PDF (168 KB)

REDOC III, an algorithm for data ciphering with a predicted throughput in hardware of over 1 Gbit/s, is a proposed replacement for DES. A Xilinx 4000 implementation, with simulation results that confirm the potential system performances, is reported View full abstract»

• ### First demonstration of laser computed tomography of human tooth by coherent detection imaging

Publication Year: 1995, Page(s):874 - 876
Cited by:  Papers (1)
| |PDF (252 KB)

The optical heterodyne technique with an argon laser as the source is used to obtain the first laser tomographic images of an extracted human tooth. The different layers of the internal structure of tooth such as dentine and pulp cavity can be clearly discerned with submillimetre resolution View full abstract»

• ### Tunable travelling-wave laser with a linear cavity configuration

Publication Year: 1995, Page(s):895 - 896
Cited by:  Papers (1)  |  Patents (2)
| |PDF (160 KB)

A travelling-wave laser with a linear configuration cavity has been demonstrated. The travelling-wave operation is provided by orthogonality of the polarisation states of counterpropagating waves. In a fibre version of the scheme proposed, lasing was obtained at 1.559-1.564 μm, and wavelength tuning was performed by a loop polarisation controller. A linewidth of less than 15 MHz and maximum out... View full abstract»

• ### Improved syllable-based continuous Mandarin speech recognition using intersyllable boundary models

Publication Year: 1995, Page(s):853 - 854
Cited by:  Papers (1)  |  Patents (1)
| |PDF (192 KB)

A novel approach to compensate for the intersyllable coarticulation effect on continuous Mandarin speech recognition by supplementing the syllable HMM models with intersyllable boundary models is proposed. Experimental results show that the syllable recognition errors of a speaker-dependent recognition task are reduced by 24% View full abstract»

• ### 40 Gbit/s AlGaAs/GaAs HBT 4:1 multiplexer IC

Publication Year: 1995, Page(s):876 - 877
Cited by:  Papers (18)
| |PDF (184 KB)

An experimental high speed 4:1 multiplexer integrated circuit capable of handling four simultaneous data channels without external delay lines is presented. The experimental circuit features an inherently fast two-stage configuration, with operation up to 40 Gbit/s demonstrated in an advanced AlGaAs/GaAs heterojunction bipolar technology. The system clock frequency is half the bit rate with only o... View full abstract»

• ### High temperature InAs infrared detector based on metal-insulator-semiconductor structure

Publication Year: 1995, Page(s):918 - 920
| |PDF (252 KB)

The Au/Cr/a-SiNx:H/(n)InAs/GaAs metal-insulator-semiconductor (MIS) capacitor was fabricated as a basic element of charge injection devices using plasma enhanced chemical vapour deposition. The electrical properties of the capacitor were analysed as a function of temperature using high frequency (1 MHz) capacitance-voltage measurements. It was demonstrated that the capacitor can still b... View full abstract»

• ### Bandpass characteristics of new dual-mode microstrip square loop resonators

Publication Year: 1995, Page(s):891 - 892
Cited by:  Papers (86)
| |PDF (208 KB)

A new type of dual-mode microstrip square loop resonator is proposed for the design of compact microwave bandpass filters. The associated characteristics of mode splitting are described. A novel bandpass filter, consisting of such a dual-mode resonator having a 1.2% bandwidth at 1.52 GHz was designed and fabricated. The measured filter performance is presented View full abstract»

• ### Simple technique for fabricating limited coupler gratings by holographic method using standard thick photoresist

Publication Year: 1995, Page(s):914 - 915
| |PDF (156 KB)

The fabrication of photoresist gratings is considered. A solution to the problem of transversal standing waves' is given and appears simple and versatile View full abstract»

• ### Fabrication of chirped fibre gratings using etched tapers

Publication Year: 1995, Page(s):908 - 909
Cited by:  Papers (10)
| |PDF (188 KB)

A technique for fabricating fibre gratings with an accurately controlled chirp profile is demonstrated. The technique involves writing a grating over a section of fibre, the cladding of which has been tapered by etching it in HF acid. A strain gradient along the taper is used to produce the chirp either during or after writing. Linearly chirped gratings with bandwidths up to 4.8 nm have been demon... View full abstract»

• ### High spurious free dynamic range fibre link using a semiconductor electroabsorption modulator

Publication Year: 1995, Page(s):902 - 903
Cited by:  Papers (28)  |  Patents (2)
| |PDF (172 KB)

A 1.32 μm suboctave analogue fibre optic link with a measured spurious free dynamic range of 123 dBHz4/5 has been demonstrated at an average detector photocurrent of 0.25 mA. This link employs a packaged InGaAsP electroabsorption waveguide modulator biased to suppress the third-order intermodulation distortion View full abstract»

• ### All-optical AND gate operating on 10 Gbit/s signals at the same wavelength using four-wave mixing in a semiconductor laser amplifier

Publication Year: 1995, Page(s):896 - 897
Cited by:  Papers (6)  |  Patents (3)
| |PDF (168 KB)

Bit error rate measurements on a new optical AND gate using four-wave mixing in a semiconductor laser amplifier and operating on degenerate wavelength input signals are presented. Operation on two 10 Gbit/s data streams with BER <10-10 shows the potential for using the device in high bit rate optical networks View full abstract»

• ### Improving the input-queueing switch under bursty traffic

Publication Year: 1995, Page(s):854 - 855
Cited by:  Papers (3)  |  Patents (1)
| |PDF (168 KB)

A new window scheme for improving the performance of nonblocking switches with input queueing under bursty traffic is proposed. The maximum throughput for the proposed scheme is measured and the scheme is shown to alleviate the effect of burst traffic on input queueing View full abstract»

• ### All-fibre diode pumped, femtosecond chirped pulse amplification system

Publication Year: 1995, Page(s):877 - 879
Cited by:  Papers (1)  |  Patents (5)
| |PDF (272 KB)

A totally integrated all-fibre femtosecond chirped pulse amplification scheme is described. Transform-limited 670 fs pulses at a 3.1 MHz repetition rate, derived from a diode pumped Yb-Er figure-of-eight fibre laser, were temporally stretched, amplified in a diode pumped Yb-Er fibre amplifier and recompressed to give 900 fs pulses of 1.6 nJ energy and an average power of 4.8 mW. Chirped Bragg fibr... View full abstract»

• ### Inversion channel vertical cavity double heterostructure optoelectronic switch lasers

Publication Year: 1995, Page(s):920 - 921
Cited by:  Papers (3)
| |PDF (196 KB)

Inversion channel technology provides a straightforward way to integrate lasers with detectors and transistors. One inversion channel laser is the double heterostructure optoelectronic switch VCSEL which is reported here with a 2.1 mA threshold for a 10 μm diameter device. A deposited stack of SiO2/TiO2 was used with post-growth etching of the cavity. Excellent electrical ... View full abstract»

• ### Raised cosine filters beyond 100% excess bandwidth

Publication Year: 1995, Page(s):859 - 860
Cited by:  Papers (3)
| |PDF (156 KB)

The authors show how the usual piecewise definition of a raised cosine response can be redefined as a convolution. This redefinition yields equations for raised cosine responses of arbitary bandwidth. Large bandwidth raised cosine filters are useful for designing interference canceller modules for communication systems View full abstract»

• ### Method of lines for analysis of waveguide structures with multidiscontinuities

Publication Year: 1995, Page(s):892 - 893
Cited by:  Papers (5)
| |PDF (164 KB)

An efficient full-wave analysis, based on the method of lines, is performed on waveguides with multidiscontinuities. Three-dimensional hybrid mode analysis is used. The spectrum of the reflection coefficient for a periodic structure is provided as an example and is in good agreement with published results. Compared to other methods, the algorithm is stable in numerical computation for a large numb... View full abstract»

• ### GaAs/AlGaAs electro-optic modulator with bandwidth >40 GHz

Publication Year: 1995, Page(s):915 - 916
Cited by:  Papers (10)  |  Patents (5)
| |PDF (156 KB)

A high speed GaAs/AlGaAs travelling wave Mach-Zehnder electro-optic modulator has been fabricated. The device uses a novel slow wave electrode design to achieve phase velocity matching and has a measured electrical bandwidth >40 GHz View full abstract»

• ### Efficient dithering of sigma-delta modulators with adaptive bit flipping

Publication Year: 1995, Page(s):846 - 847
Cited by:  Papers (3)  |  Patents (5)
| |PDF (156 KB)

A new technique is presented for dithering single bit sigma-delta modulator (SDM) A/D and D/A converters in the digital domain. The system operates by detecting and randomising the limit cycle oscillations responsible for baseband tones. The system is efficient to implement in hardware and does not surfer from the analogue dither that is required in conventional SDM A/D converters View full abstract»

• ### Design of aperture coupled microstrip antenna array fed by dielectric image line

Publication Year: 1995, Page(s):843 - 845
Cited by:  Papers (7)
| |PDF (224 KB)

A novel design for a linear array of microstrip antennas, aperture coupled to a dielectric image line has been developed. The design is based on a simplified theory to determine the impedances of the antennas at their apertures, and in turn, the coupling to each antenna from the image line. The theory developed is verified using an eight-element linear array and the experiment results are very goo... View full abstract»

• ### Control of chaos in the boost converter

Publication Year: 1995, Page(s):841 - 842
Cited by:  Papers (11)
| |PDF (156 KB)

A method for controlling chaos which is particularly suitable for switching circuits is presented. The method has been successfully applied to the current-mode controlled boost converter which is a piecewise linear system with switching nonlinearity 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