# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 31
• ### Ohmic contacts on n-GaAs produced by laser alloying of Ge films

Publication Year: 1980, Page(s):113 - 114
Cited by:  Papers (1)
| | PDF (369 KB)

A Q-switched Nd:y.a.g. laser has been used to form ohmic contacts on n-type GaAs covered with an evaporated film of Ge. The contacts showed good surface morphology with contact resistivities as low as 10Â¿6 Â¿ cm2. View full abstract»

• ### S.A.W. monolithic acoustoelectronic oscillator

Publication Year: 1980, Page(s):114 - 115
Cited by:  Papers (2)
| | PDF (326 KB)

S.A.W. and high-frequency signal generations are reported in c.w. monolithic acoustoelectronic amplifier with electrical feedback. View full abstract»

• ### 800 Mbit/s optical transmission experiments with dispersion-free fibres at 1.5 Â¿m

Publication Year: 1980, Page(s):115 - 117
Cited by:  Papers (6)
| | PDF (501 KB)

By using dispersion-free single-mode fibres at 1.5 Â¿m, where silica fibres have minimum loss, an optical transmission experiment was successfully carried out at 800 Mbit/s with 20 km repeater spacing. Error rate against receiving optical level characteristics showed that the optical power penalty caused by fibre dispersion is negligible after long line transmission at 1.5 Â¿m. View full abstract»

• ### Comments on: Floating ideal inductor with one d.v.c.c.s.Â¿ and Novel capacitor flotation schemeÂ¿

Publication Year: 1980
| | PDF (155 KB)

First Page of the Article
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• ### Reply to: Comments on Floating ideal inductor with one d.v.c.c.s.Â¿ and Novel capacitor flotation schemeÂ¿

Publication Year: 1980
| | PDF (155 KB)

First Page of the Article
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• ### Novel proof-tester for optical glass fibres

Publication Year: 1980, Page(s):117 - 119
Cited by:  Papers (1)
| | PDF (495 KB)

A compact novel proof-tester has been developed which strains the fibre by bending it over known diameter rollers. The proof-tester truncates the Weibull strength distribution at the expected level, indicating that it induces little damage in fibre with a thin primary coating. View full abstract»

• ### Easily testable sequential machines with extra inputs and extra outputs

Publication Year: 1980, Page(s):119 - 121
Cited by:  Papers (1)
| | PDF (520 KB)

In a recent paper, Fujiwara et al. presented an efficient procedure for designing checking experiments for sequential machines. In this procedure any arbitrary sequential machine is augmented to an easily testable machine by adding only two special input symbols to the original machine. An easily testable machine is defined by the authors as a reduced and strongly connected machine which possesses... View full abstract»

• ### Kink-free narrow-stripe proton-isolated GaAlAs/GaAs injection lasers

Publication Year: 1980, Page(s):121 - 123
| | PDF (443 KB)

Totally kink-free and very-narrow-stripe proton-isolated injection lasers are presented. The standard gold-indium metal-contact bonding system has been investigated, and as a result an improved bonding technique is presented. Kink-free lasers with output power up to 20 mW have been accelerated at 80Â°C ambient for 1000 h without any change in thermal resistance and with an expected lifetime of abo... View full abstract»

• ### Transient response of sample-and-hold circuits

Publication Year: 1980, Page(s):123 - 124
| | PDF (236 KB)

The transient response of sample-and-hold circuits with parabolic approximation of switch resistance is considered. As a rule, such a law gives a maximum guaranteed duration for the transient process (acquisition time). View full abstract»

• ### S.A.W. implementation of whitening filters for satellite digital communications

Publication Year: 1980, Page(s):124 - 125
Cited by:  Papers (5)
| | PDF (267 KB)

The ability of a s.a.w. filter to match arbitrary frequency response is demonstrated for an x/sin x specification. This yields a valuable improvement for satellite digital communications around the 70 MHz intermediate frequency. Both design rules and experimental results are reported. View full abstract»

• ### Filtre recursif nonlineaire [Nonlinear recursive filter]

Publication Year: 1980, Page(s):125 - 127
| | PDF (371 KB)

Un filtre rÃ©cursif nonlinÃ©aire est synthÃ©tisÃ© de faÃ§on simple par utilisation de la transformÃ©e de Laguerre multivariable et d'un isomorphisme entre l'espace des signaux continus et l'espace des signaux discrets. A nonlinear recursive filter is easily synthesised by use of the multidimensional Laguerre transform and of an isomorphism between the continuous-signals space and the discrete-sign... View full abstract»

• ### New wideband microstrip antenna using log-periodic technique

Publication Year: 1980, Page(s):127 - 128
Cited by:  Papers (15)
| | PDF (276 KB)

A novel wideband microstrip antenna using a series-fed linear array of patch resonators in a log-periodic arrangement is described. A 9-element example gives good input v.s.w.r. and radiation control over a 30% bandwidth with better than 70% efficiency. The new array configuration gives wider bandwidth than single-layer or stacked microstrip patches combined with better efficiency than patches on ... View full abstract»

• ### Relationship between system delay and transmission rate in time-encoded speech

Publication Year: 1980, Page(s):128 - 130
| | PDF (409 KB)

The system delay involved in time-encoded speech can be made tolerable by a modest increase in transmission rate over average source generation rate. View full abstract»

• ### Storage correlator as an adaptive inverse filter

Publication Year: 1980, Page(s):130 - 131
Cited by:  Papers (4)
| | PDF (333 KB)

The application of an acoustic surface wave (a.s.w.) monolithic zinc oxide on silicon storage correlator as a wideband adaptive inverse filter is reported. The impulse response of the filter is updated by using the iterative l.m.s. algorithm. This application was demonstrated by suppressing the level of an undesirable time-delayed echo pulse by 10 dB. View full abstract»

• ### Improved circuit elements for switched-capacitor ladder filters

Publication Year: 1980, Page(s):131 - 133
Cited by:  Papers (9)
| | PDF (358 KB)

A new switched-capacitor floating inductance simulation circuit which does not depend on matching of passive elements is presented. A switched-capacitor source termination circuit which functions as a sample-and-hold circuit for a filter is also described. View full abstract»

• ### Effect of dead time on closed-loop regulation

Publication Year: 1980, Page(s):133 - 134
| | PDF (242 KB)

The steady-state performance of closed-loop regulation in the presence of random disturbance is found to be dependent on a crosspower term. Without dead time, this term is negative, resulting in good disturbance rejection. The presence of dead time will increase the crosspower term and may even reverse its sign, resulting in poorer performance. Furthermore, the closed-loop regulation may be worse ... View full abstract»

• ### Reduction of sidelobes in uniformly excited arrays with element pattern control

Publication Year: 1980, Page(s):134 - 135
Cited by:  Papers (1)
| | PDF (228 KB)

Uniformly excited arrays of identical elements suffer from high close-in sidelobes. Suppression of sidelobe levels can be achieved by tapering the aperture amplitude distribution, but a more complex feed network results. A novel form of amplitude tapering is described, in which element pattern control in uniformly excited arrays is shown to theoretically reduce close-in sidelobe levels. View full abstract»

• ### Multi-glass-rod optical-fibre splicers made by drawing technique

Publication Year: 1980, Page(s):136 - 138
| | PDF (562 KB)

New splicers for optical fibres have been fabricated in a process in which arrayed glass rods are heated and drawn together. The splicers exhibit low average splicing loss of less than 0.1 dB, slight loss fluctuation of less than 0.05 dB in the temperature range Â¿20Â°C~ +60Â°C, and are potentially low in cost. View full abstract»

• ### Detecting instability in concavity trees

Publication Year: 1980, Page(s):138 - 139
| | PDF (295 KB)

A simple algorithm is described for detecting the possibility of encountering instability in the set of concavity trees generated from a class of very similar shapes (i.e. those which can be represented by a single archetype). The algorithm can detect instability in deep m-concavities but is unable to accommodate shallow depressions in the edge. However, an earlier paper showed that the latter can... View full abstract»

• ### Discrete cosine transform processor using a c.c.d. programmable transversal filter

Publication Year: 1980, Page(s):139 - 141
| | PDF (388 KB)

The design and performance of a compact discrete-cosine prime-transform processor using a charge-coupled-device programmable transversal filter is reported. The c.c.d. design used here allows the required operations of data permutation and correlation to be performed in the same device. In addition, this arrangement permits an N-stage c.c.d. filter to be used for implementation of an N-point trans... View full abstract»

• ### Improved circuit for switched-capacitor simulation of an inductor

Publication Year: 1980, Page(s):141 - 142
Cited by:  Papers (8)
| | PDF (257 KB)

A new circuit for the switched-capacitor realisation of a lossless inductance, which is based on the bilinear transformation, is described. It requires only a grounded-input grounded-output operational amplifier and three capacitors. View full abstract»

• ### 4-Bits digitally driven integrated amplitude modulator for data processing

Publication Year: 1980, Page(s):142 - 144
Cited by:  Papers (15)
| | PDF (502 KB)

A digitally driven integrated-optical amplitude modulator, acting as a digital-analogue convenor, has been fabricated on a LiNbO3 substrate. It can be driven by 4-bits digital circuitry with a command voltage of 2.6 V. View full abstract»

• ### Improved framing circuit and its performance evaluation

Publication Year: 1980, Page(s):144 - 146
| | PDF (356 KB)

An improved framing circuit is described, which checks all the consecutive data bits in a frame for possible framing-bit candidacy. A lumped absorbing Markov-chain model is established for characterising its reframe process. A general algorithm is presented for finding the average reframe time directly from the transition matrix. View full abstract»

• ### 2.0 Â¿m c.w. operation of GaInAsSb/GaSb d.h. lasers at 80 K

Publication Year: 1980, Page(s):146 - 147
Cited by:  Papers (3)
| | PDF (239 KB)

GaInAsSb/GaSb double-heterostructure (d.h.) lasers were fabricated by liquid-phase-epitaxial growth. C.W. operation was realised at 80 K with a wavelength of 2.0 Â¿m. From measurement of laser thresholds as a function of temperature, it was shown that threshold currents for pulsed operation are described by the expression I(T) Â¿ exp (T/T0), where T0 = 58 K. View full abstract»

• ### Power spectrum of scrambled signal

Publication Year: 1980, Page(s):147 - 148
| | PDF (257 KB)

The general formula for the power spectrum of a binary signal encoded by a self-synchronising scrambler is derived and applied for 2-, 3-, 4- and 5-stage scramblers and for the different probabilities of `onesÂ¿ in the input binary sequence. 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