# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 27
• ### Design procedures for a printed-circuit-board transmission-line transformer

Publication Year: 1975, Page(s):609 - 610
| | PDF (292 KB)

A method of design is given for transmission-line transformers operating up to the gigahertz region, using printed-circuit-board spiral lines which fit inside an RM core. Results of measurements on a 2:1 transformer made to this design and which has a passband from 150 kHz to 1 GHz are given. View full abstract»

• ### Magnetically tuned surface-acoustic-wave phase shifter

Publication Year: 1975, Page(s):610 - 611
Cited by:  Papers (18)
| | PDF (308 KB)

A novel technique for achieving variable phase shift in surface-acoustic-wave devices is demonstrated. By depositing a thin film of magnetostrictive material onto the surface of a conventional surface-acoustic-wave delay line, the wave velocity can be varied by adjusting an externally applied magnetic field. Experimental results are presented for a nickel film on a lithium-niobate substrate, and s... View full abstract»

Publication Year: 1975, Page(s):611 - 613
| | PDF (483 KB)

A broadband cylindrical antenna with continuous resistive and concentrated capacitive loadings was constructed and investigated theoretically and experimentally. The antenna was found to have very good broadband properties, both in admittance and radiation pattern, and an efficiency considerably higher than that of purely resistive broadband cylindrical antenna. View full abstract»

• ### Multistable circuit using complementary field-effect transistors

Publication Year: 1975, Page(s):613 - 614
| | PDF (296 KB)

A 2-terminal circuit formed by two series-connected mutually biased complementary depletion-mode field-effect transistors conducts within a limited voltage range. A parallel combination of such circuits with varying biases has a periodic characteristic with the voltage a multivalued function of the current. A multistable circuit that uses this characteristic is presented. View full abstract»

• ### Acoustic-surface-wave convolver on epitaxial gallium arsenide

Publication Year: 1975, Page(s):614 - 615
Cited by:  Papers (4)
| | PDF (272 KB)

A meander-gate field-effect transistor on epitaxial GaAs is used as an acoustic-surface-wave convolver. A bilinear coefficient as high as 2Ã10Â¿4 mWÂ¿1 has been measured at 260 MHz. The active area is only 1.8 mm long and the acoustic beam width is 0.7 mm. View full abstract»

• ### Compatible 2-channel encoding of surround sound

Publication Year: 1975, Page(s):615 - 617
| | PDF (429 KB)

Several families of methods are discussed for encoding 2-channel surround sound, with a view to optimising mono and stereo compatibility. We discuss the mono balance, stereo image width and phasiness of various systems with symmetric circle, nonsymmetric circle and bent circleÂ¿ loci on the representational sphere. View full abstract»

• ### Analysis of the noncollinear acousto-optic filter

Publication Year: 1975, Page(s):617 - 618
Cited by:  Papers (8)
| | PDF (278 KB)

Theoretical analysis of an acousto-optic filter using noncollinear interaction is presented. The various characteristics of the filter, including tuning curve, resolution, angular aperture and deflection angle, are determined. The theoretical calculations are in good agreement with the measured results of a TeO2 filter. View full abstract»

• ### Static characteristics of extremely thin gate oxide m.o.s. transistors

Publication Year: 1975, Page(s):618 - 620
Cited by:  Papers (4)
| | PDF (441 KB)

The drain current of an extremely thin gate oxide m.o.s. transistor shows an exponential dependence both on drain voltage and gate voltage, even in the postthresholdÂ¿ region. The input gate current of a device with 20 Ã gate oxide is estimated to be negligible for a logic-circuit operation with 0.2 V supply voltage. View full abstract»

• ### Miniature ultra-broad-band voltage probe

Publication Year: 1975, Page(s):620 - 621
Cited by:  Papers (1)
| | PDF (345 KB)

A miniature voltage probe giving a good response over 2Â¿18 GHz is described. It is constructed from standard OSSM line of approximately 2 mm diameter, and has been used in a miniature l.s.a. circuit for measuring Gunn-diode l.s.a. waveforms with harmonics up to 14 GHz. View full abstract»

• ### Ideal ohmic contacts to InP

Publication Year: 1975, Page(s):621 - 622
| | PDF (347 KB)

A new method of producing ohmic contacts to semiconducting n-type InP by the use of a slow alloying cycle with a P overpressure has resulted in improved contact fabrication. Gunn devices were produced with these contacts for the anode and cathode and their microwave characteristics were measured. View full abstract»

• ### RC immitances and periodically switched networks

Publication Year: 1975, Page(s):622 - 623
Cited by:  Papers (1)
| | PDF (256 KB)

Practical applications have motivated the design of a variety of lumped-element networks, including one or more periodically operating switches. A systematic procedure is presented for obtaining the equivalence of such switched networks and RC 1-port networks. View full abstract»

• ### General excitation table for a JK multistable

Publication Year: 1975
Cited by:  Papers (1)
| | PDF (110 KB)

The excitation table of a general P-valued JK-type multistable is developed. This table does not depend on the number of levels of the logic to be used. View full abstract»

• ### Prescriptive method for deriving control policy in a fuzzy-logic controller

Publication Year: 1975, Page(s):625 - 626
Cited by:  Papers (19)
| | PDF (302 KB)

A method of controlling a plant by a fuzzy algorithm has been proposed earlier. This method requires the complete description of the control policy as linguistic rules. Here we give a prescriptive method for deriving the best policy during run time. Results suggest the method is useful when the plant is subject to time-varying parameter changes and unknown disturbances. View full abstract»

• ### Computation of the scattering matrix of a class of reciprocal lossless 2-ports from one short-circuit measurement

Publication Year: 1975, Page(s):626 - 628
| | PDF (443 KB)

A procedure has been developed for the identification of a class of generalised transmission lines by starting from the measurement of the reflection coefficient at one port, while the other one is short circuited. The procedure is implemented on a small digital computer and uses the properties of the discrete Fourier transform and digital signal processing. View full abstract»

• ### Irrelevant shifts of black--white transitions for efficient run-length coding of graphics

Publication Year: 1975
| | PDF (138 KB)

For more efficient run length coding of 2-level images, a code is described in which some run lengths have been eliminated, in order to allow a higher run-length count with a given codeword length. This causes irrelevant 1 pel shifts of the black--white transitions in the processed picture. View full abstract»

• ### Relationship between maximal parallelism and maximal simultaneity in a directed-graph model of parallel computation

Publication Year: 1975, Page(s):629 - 630
| | PDF (299 KB)

The relationship between maxima parallelism and simultaneity in parallel computation schemata is demonstrated, and it is shown that a single procedure is sufficient for transforming a determinate schema into one exhibiting both these properties. A practical consequence of this procedure is that parallel hardware may be designed initially in a serial fashion. View full abstract»

• ### Propagating avalanche-zone mode for high-efficiency GaAs lo--hi--lo IMPATT structures

Publication Year: 1975, Page(s):630 - 631
Cited by:  Papers (1)
| | PDF (327 KB)

The superiority of high-efficiency hi--lo and lo--hi--lo impatt structures over conventional structures and the distinctive tuning characteristics of these structures have been largely explained in terms of a variety of drift-region mechanisms common to both structures. There are, however, sometimes distinct differences between the large-signal behaviour of the two structures, and these have not b... View full abstract»

• ### Computing the zeros of systems

Publication Year: 1975, Page(s):631 - 632
Cited by:  Papers (5)
| | PDF (310 KB)

Shamashs's method for determining the numerator a transfer function between a particular output and input of a multivariable system has been modified by the use of a continued fraction to effect a saving in computational effort. View full abstract»

• ### Optimally aggregated models of high-order systems

Publication Year: 1975, Page(s):632 - 633
Cited by:  Papers (2)
| | PDF (268 KB)

A straightforward scheme for generating optimally aggregated models of high-order systems is presented. The simplicity of the scheme is a direct result of generalising the model forms under consideration. The interesting case of optimal projection along invariant subspaces is a special case. Finally, the notion of quasioptimal aggregated models is introduced, which reduces computation considerably... View full abstract»

• ### Ray-tracing technique for evaluating the dispersion characteristics of graded-index cylindrical fibres

Publication Year: 1975, Page(s):633 - 635
| | PDF (379 KB)

A method which uses ray-tracing techniques and modal relations is sketched for the determination of the dispersion characteristics of cylindrical fibres with radial graded-index distribution. Examples of the results obtained are described, which show how it is possible, applying this procedure, to fully analyse propagation in optical fibres with any refractive-index distribution. View full abstract»

• ### ATS-6 satellite 20 GHz propagation measurements at low elevation angles

Publication Year: 1975, Page(s):635 - 636
Cited by:  Papers (2)
| | PDF (311 KB)

The 20 GHz downlink from the ATS-6 satellite was monitored almost continuously for low elevation angles (below 9Â°). The authors measured the copolarised and crosspolarised signals received, as well as the local rain rate. Data are presented for clear-weather scintillations, rain attenuation, depolarisation and other effects. View full abstract»

• ### Extended-dynamic-range measurements on transmitter noise and intermodulation

Publication Year: 1975, Page(s):636 - 638
| | PDF (455 KB)

A measurement technique is reported for the investigation of intermodulation and noise spectra from VHF transmitters operating at full power and with controlled mutual coupling. View full abstract»

• ### GaAs planar Gunn digital devices by sulphur-ion implantation

Publication Year: 1975, Page(s):638 - 639
Cited by:  Papers (2)
| | PDF (326 KB)

Schottky-barrier-gate Gunn-effect devices have been fabricated in n-type layers produced by sulphur-ion implantation into Cr-doped semi-insulating GaAs substrates. The device performance was examined and a satisfactory gate trigger sensitivity was obtained under d.c. bias conditions. View full abstract»

• ### Stability analysis of multistage feedback amplifiers in terms of element-perturbation theory

Publication Year: 1975, Page(s):639 - 641
| | PDF (589 KB)

Previously published analysis of the perturbations of network functions resulting from finite changes in network components is reformulated to allow the inclusion of active elements. It is then found that classical stability analysis can be simply reformulated in terms of this perturbation analysis. This leads to greatly simplified procedures for computing not only the return differences required ... View full abstract»

• ### Two-dimensional computer design of dual-ring thyristors

Publication Year: 1975, Page(s):641 - 642
| | PDF (273 KB)

The main 2-dimensional equations are presented for the basic computer model of dual-ring amplifying gate thyristors (d.r.t.). These criteria ensure the maintenance of the very high di/dt capability of these devices in any possible triggering conditions. 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