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# Electronics Letters

## Filter Results

Displaying Results 1 - 24 of 24
• ### Algorithm for solving a class of phase-lock-loop equations

Publication Year: 1983, Page(s):153 - 154
Cited by:  Papers (2)
| | PDF (204 KB)

An algorithm for solving the nonlinear Volterra equation of an nth-order phase-lock loop having all poles simple is presented. The proposed formulas are quite general with respect to the phase-detector nonlinearity and require little computational effort. View full abstract»

• ### Analysis of radiative and nonradiative recombination law in lightly doped InGaAsP lasers

Publication Year: 1983, Page(s):154 - 155
Cited by:  Papers (12)
| | PDF (258 KB)

A re-analysis of the recombination data of Su et al. on lightly doped InGaAsP lasers indicates that their figure for the Auger coefficient is uncertain and up to three times too low, does not support their claim of saturation in the radiative recombination, but confirms the presence of a second nonradiative mechanism more sensitively dependent on carrier concentration than the cube. View full abstract»

• ### High-performance modulation-doped GaAs integrated circuits with planar structures

Publication Year: 1983, Page(s):155 - 157
Cited by:  Papers (8)
| | PDF (525 KB)

A planar process of using proton isolation for modulationdoped GaAs/GaAlAs integrated circuits is presented. Devices with very low contact resistance (~ 5 Ã 10Â¿7 Â¿ cm2) and very high transconductance (~ 210 ms/mm) have been achieved. DCFL ring oscillators with 10 Â¿m switching FETs have been operated at Â¿ = 36.6 ps at room temperature and 27.3 ps at 77 K. The lowest speed-power product is 2.43... View full abstract»

• ### Semi-lossy two-port and a theorem concerning RLCn networks

Publication Year: 1983, Page(s):157 - 159
| | PDF (393 KB)

By semi-lossy two-portÂ¿ is meant a passive two-port being dissipation-free for some particular form of excitation. Some properties of these two-ports are derived using the impedance matrix. The meaning of these results for the scattering formalism is given. Furthermore a theorem is derived concerning networks built up of passive (ideal) transformers, inductors, capacitors and resistors. View full abstract»

• ### Simultaneous scanning optical and acoustic microscopy

Publication Year: 1983, Page(s):159 - 160
Cited by:  Papers (4)
| | PDF (378 KB)

We have demonstrated a combined scanning acoustic and optical microscope capable of simultaneously recording acoustic and optical images of the same field of view. The estimated resolution of the optical (6328 Ã) and acoustic (550 MHz) images is 2 Â¿m, in good agreement with theory. The system is ideally suited to photoacoustic microscopy. View full abstract»

• ### Dependence of electron mobility on spacer thickness and electron density in modulation-doped Ga0.47In0.53As/Al0.48In0.52As heterojunctions

Publication Year: 1983, Page(s):160 - 162
Cited by:  Papers (6)
| | PDF (459 KB)

Modulation-doped Ga0.47In0.53As/Al0.48In0.52As heterojunctions were grown by molecular beam epitaxy. Electron mobilities were measured at room temperature and 77 K as a function of undoped Al0.48In0.52As spacer layer thickness and sheet carrier concentration. Enhanced mobilities were as high as 10 900 cm2VÂ¿1sÂ¿1 at room temperature and 55 500 cm2VÂ¿1sÂ¿1 at 77 K in these samples with sheet carrie... View full abstract»

• ### GaAs integrated digital-to-analogue convertor for control of power dual-gate FETs

Publication Year: 1983, Page(s):162 - 163
Cited by:  Papers (1)
| | PDF (258 KB)

We are reporting the design, fabrication and performance of a TTL compatible 4-bit GaAs integrated digital-to-analogue convertor with an output voltage between Â¿2.8 V and +2.8 V. This circuit has been especially designed to control the gain of power dual-gate FETs by applying a voltage on the capacitively terminated second gate. View full abstract»

• ### 0.66 Â¿m room-temperature operation of InGaAlP DH laser diodes grown by MBE

Publication Year: 1983, Page(s):163 - 165
Cited by:  Papers (5)
| | PDF (407 KB)

Room-temperature pulsed operation of In0.49Ga0.31Al0.20P/In0.49Ga0.48Al0.03P/In0.49Ga0.31Al0.20P double heterostructure (DH) laser diodes has been achieved for the first time. The DH layers were grown by molecular beam epitaxy. The lasing wavelength was 0.66 Â¿m and the threshold current density was 3.2Â¿3.6 Ã 104 A/cm2 at room temperature. View full abstract»

• ### Rayleigh scattering in fluoride glass optical fibres

Publication Year: 1983, Page(s):165 - 166
Cited by:  Papers (3)
| | PDF (306 KB)

The present study has verified for the first time the explicit Â¿Â¿4 Rayleigh behaviour of light scattering in fluoride glass optical fibres and has projected an ultra-low Rayleigh scattering loss of at least 0.012 dB/km at 4 Â¿m. View full abstract»

• ### Polarisation-dependent gain-current relationship in GaAs-AlGaAs MQW laser diodes

Publication Year: 1983, Page(s):166 - 168
Cited by:  Papers (18)
| | PDF (381 KB)

The polarisation-dependent gain spectra were measured for multi-quantum-well laser diodes. Differences in the gain-current relationship and in the peak gain wavelength between TE and TM polarisations are explained by a newly developed model. View full abstract»

• ### New phase-shifting technique for group-type unidirectional transducers used in surface-acoustic-wave filters

Publication Year: 1983, Page(s):168 - 169
Cited by:  Papers (2)
| | PDF (339 KB)

The letter reports a novel method of phase shifting useful in the group type of unidirectional transducers used for the design of low-loss SAW filters. This technique utilises the thin-film capacitance present between the newly described configuration of the feed-electrode layers as an essential element of the required phase shifter. The stray capacitance existing between the feed electrodes is us... View full abstract»

• ### Phase-locked (GaAl)As laser diode emitting 2.6 W CW from a single mirror

Publication Year: 1983, Page(s):169 - 171
Cited by:  Papers (37)
| | PDF (442 KB)

A phase-locked multiple-quantum-well (GaAl)As injection laser with a highly reflective rear facet coating and a low reflective front facet coating is reported to emit 2.6 W CW at room temperature from the front facet. View full abstract»

• ### New flowgraph mode and calibration procedure for S-parameter measurements of devices mounted in microstrip fixture

Publication Year: 1983, Page(s):171 - 173
| | PDF (381 KB)

The letter reports microstrip devices under test (DUT), and gives a new flowgraph mode and calibration procedure for determining error terms. Explicit formulas are given for error terms and S-parameters of the DUT. View full abstract»

• ### Finite cladding effects in W-fibres: a new interpretation of leakage losses

Publication Year: 1983, Page(s):173 - 174
| | PDF (282 KB)

According to both experiments and calculations, the HE11 mode in depressed inner-cladding single-mode fibres should not be described beyond cutoff with the leaky mode formalism but with a formalism of coupling between a core mode and discrete, lossy cladding modes. View full abstract»

• ### Statistical identification of difference equation representations for nonlinear systems

Publication Year: 1983, Page(s):175 - 176
Cited by:  Papers (3)
| | PDF (241 KB)

A method is proposed for identifying a difference equation representation for a nonlinear system, by identifying a series of simpler difference equations. The method yields the difference equation representation which is optimal in the least-square sense, and applies to a wide variety of different inputs. View full abstract»

• ### Cancellation performance degradation of a fully adaptive Yagi array due to inner-element coupling

Publication Year: 1983, Page(s):176 - 177
Cited by:  Papers (3)
| | PDF (273 KB)

The effect of inner-element coupling on the cancellation performance of a fully adaptive Yagi array is considered. Graphs of the output residue power as functions of interference-to-noise ratio and bandwidth with and without the inner-coupling effect are presented. It is seen that mutual coupling, like any other frequency-dependent error source, poses a severe limitation to the ability of the arra... View full abstract»

• ### Measurement of screened voltages by electron-beam-induced conductivity (EBIC)

Publication Year: 1983, Page(s):177 - 178
| | PDF (290 KB)

A new method is introduced to measure screened voltages by EBIC. Some applications are shown. View full abstract»

• ### Mutual coupling between short-circuited microstrip antennas

Publication Year: 1983, Page(s):178 - 180
Cited by:  Papers (1)
| | PDF (385 KB)

A method has been previously developed for the computations of mutual coupling between the usual rectangular printed antennas. In the letter the short-circuited antennas with three magnetic walls and an electric wall (Fig. 2) are investigated. Using the cavity model with hybrid boundary conditions (magnetic wall and electric wall) and the equivalence theorem, the problem is reduced to the interact... View full abstract»

• ### Dynamic behaviour of a GaAs-AlGaAs MQW laser diode

Publication Year: 1983, Page(s):180 - 181
Cited by:  Papers (6)
| | PDF (314 KB)

A comparative study is given on the dynamic properties existing between a GaAs-AlGaAs multi-quantum-well (MQW) laser diode fabricated from an MBE-grown wafer and a conventional double-heterostructure laser diode. Spectral broadening and wavelength shift associated with deep injection current modulation were found to be much smaller in MQW laser diodes than in conventional DH laser diodes. View full abstract»

• ### Bulk unipolar diodes in MBE GaAs

Publication Year: 1983, Page(s):181 - 183
Cited by:  Papers (4)
| | PDF (403 KB)

Bulk unipolar (camel) diodes in GaAs have been made using thin, buried p+ layers doped with beryllium and grown by MBE. Barrier heights in the range 0.55 eV to 0.94 eV have been obtained by varying the p+-layer thickness. In all cases the ideality factors of the diodes were less than 1.5. View full abstract»

• ### Stability equation method to reduce the order of fast oscillating systems

Publication Year: 1983, Page(s):183 - 184
Cited by:  Papers (1)
| | PDF (312 KB)

A method for linear order reduction is proposed which, for fast oscillating systems, is superior to a number of other techniques (stability equation method, classic PadÃ© technique etc.). For low-frequency systems the proposed method and the stability equation method yield identical results. View full abstract»

• ### New single-mode single-polarisation optical fibre

Publication Year: 1983, Page(s):185 - 186
Cited by:  Papers (10)
| | PDF (280 KB)

The theory for understanding fibres composed of highlyÂ¿ birefringent material is presented. One of the two possible polarisation states of the fundamental mode can be made leaky, suggesting a novel single-mode single-polarisation fibre design. No leakage occurs in planar waveguides constructed similarly from the identical material. View full abstract»

• ### S-domain realisation of sea spectrum

Publication Year: 1983, Page(s):186 - 187
| | PDF (258 KB)

A convenient filter is put forward for generating sea disturbances as specified by the Pierson-Moskowitz spectrum. The coefficients for the filter are tabulated as a function of Beaufort number. Information is given on the filter dynamics. View full abstract»

Publication Year: 1983, Page(s):187 - 188
Cited by:  Papers (3)
| | PDF (261 KB)

A depolarised broadband source is demonstrated by depolarising the output of a superluminescent diode with a short length of Hitachi single polarisation fibre. A degree of polarisation of less than 10Â¿3 is achieved. 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