By Topic

# Electronics Letters

## Filter Results

Displaying Results 1 - 21 of 21
• ### Microwave 2nd-harmonic generator of high conversion efficiency using the nonlinearity of negative resistance in n type GaAs

Publication Year: 1972, Page(s):141 - 142
| | PDF (317 KB)

Theoretical considerations and experimental studies of a microwave harmonic generator using the nonlinearity of negative resistance in n type GaAs for a small-signal excitation are performed to develop solid-state millimetre-wave devices. Experimental results using a Gunn diode show the very high conversion efficiency and the possibility of millimetre-wave generation. View full abstract»

• ### Stabilising surface-wave devices against temperature variations

Publication Year: 1972, Page(s):142 - 143
Cited by:  Papers (4)
| | PDF (344 KB)

Surface-elastic-wave devices can be temperature-stabilised with a feedback circuit which includes a phase comparator for a reference signal and a deposited thin-film heater. In a 50 MHz yz lithium-niobate test delay line, the phase variation corresponded to a maximum temperature change of Â±0.017Â°C, while the ambient temperature varied from 25 to 35Â°C. View full abstract»

• ### Improved algorithm for the construction of minimal spanning trees

Publication Year: 1972, Page(s):143 - 144
Cited by:  Papers (1)
| | PDF (318 KB)

An improved algorithm for the construction of minimal spanning trees is proposed which is particularly suitable for use with data sets containing repeated elements. The algorithm may be applied to cluster-detection and pattern-segmentation problems, such as arise in automatic speech recognition. View full abstract»

• ### New type of analogue multiplier with wide dynamic range

Publication Year: 1972, Page(s):145 - 146
| | PDF (366 KB)

For reasons which are discussed in this letter, the dynamic range of existing transconductance-type analogue multipliers falls short of that imposed by device limitations when they are used in a constant-output mode. It is shown that, by employing a new type of circuit in the feedback path of an operational amplifier, a dynamic range of 86 dB can be obtained over a control range of 30 dB with less... View full abstract»

• ### New concept in electrostatic rotation

Publication Year: 1972, Page(s):146 - 147
| | PDF (329 KB)

This letter describes a new electrostatic-rotation phenomenon. While the concept of using electrostatic forces to produce rotation is very old, the author believes that the method of rotor-charge-gradient production described in this letter and its utilisation for obtaining rotational torque, are new and unique. Although the above device leaves much to be desired in the way of output torque and ef... View full abstract»

• ### 1.06 μm absorption coefficients of deuterated KDP with 70--100% deuteration

Publication Year: 1972, Page(s):147 - 148
| | PDF (335 KB)

The absorption coefficients for ordinary and extraordinary rays were measured at 1.06 μm for a number of samples using a calorimetric method. The values range up to 3%/cm, and are plotted against the Curie temperature determined by relative/permittivity/temperature runs. Also plotted are electro-optic halfwave voltages at 0.633 μm against Curie temperature. The data are relevant to... View full abstract»

Publication Year: 1972, Page(s):148 - 149
Cited by:  Papers (1)
| | PDF (351 KB)

A cylindrical antenna with easily adjustable quasidistributed capacitive loading is described, which is convenient for experimental investigation of such structures. Some experimental results for admittances are presented, showing excellent broadband properties of the antenna and a satisfactory agreement with theoretical values. View full abstract»

• ### Multiaxis radial circuit for transferred-electron devices

Publication Year: 1972, Page(s):149 - 151
Cited by:  Papers (1)
| | PDF (435 KB)

A class of multiaxis radial circuits for optimised performance of transferred-electron devices is presented. Nearly octave bandwidth c.w. amplification occurred with one configuration in preliminary tests. Extensive pulsed l.s.a. tests in the range 2Â¿8 GHz have been made with another configuration, yielding the full efficiency expected from theory. View full abstract»

• ### Simple circuit to double the output-voltage swing of an operational amplifier with increased slew rate

Publication Year: 1972, Page(s):151 - 152
Cited by:  Papers (1)
| | PDF (248 KB)

A method of doubling the output-voltage swing and to increasing the slew rate of an operational amplifier is described. Two practical circuits and experimental results are given. View full abstract»

• ### Comment on 'Can a pulse excitation smaller than kT be detected?'

Publication Year: 1972, Page(s):152 - 153
| | PDF (266 KB)

A recent author has proposed Ã¡ system incorporating a delay line to detect pulses of energy less than kT. In this letter, it is pointed out that the detection of pulses of energy less than kT, by means of conventional active filters, is commonplace in the field of electronic engineering. View full abstract»

• ### Simple sensitivity formulas in terms of immittance parameters

Publication Year: 1972, Page(s):153 - 155
Cited by:  Papers (1)
| | PDF (322 KB)

Simple formulas are derived for computing the sensitivities of a network function with respect to its network elements for a lumped/distributed active network. These formulas are in terms of immittance parameters of an augmented network. It is shown that these formulas may be used directly for the computation of higher-order sensitivities. View full abstract»

• ### Second-order recursive digital-filter element for poles near the unit circle and the real z axis

Publication Year: 1972, Page(s):155 - 156
Cited by:  Papers (7)
| | PDF (218 KB)

An arrangement of a 2nd-order element for recursive digital filters is described which is particularly suitable when the desired poles are close to the unit circle and the real z axis in the z plane. Details are given for implementing the element using a single multiply-and-addÂ¿ arithmetic unit. View full abstract»

• ### Beryllium 100 ns acoustic delay line

Publication Year: 1972, Page(s):156 - 157
| | PDF (282 KB)

A beryllium single crystal is used to fabricate an acoustic delay line. The sputtered ZnO transducers are deposited on the (0001) surfaces. A delay of 110 ns is obtained in the range 1000¿¿2000 MHz with an insertion loss of about 50 dB and spurious responses below 70 dB. View full abstract»

• ### Maximally flat nonrecursive digital filters

Publication Year: 1972, Page(s):157 - 158
Cited by:  Papers (16)
| | PDF (268 KB)

In a recent letter, coefficients for a maximally flat nonrecursive transfer function were obtained via a special solution to the Hermite interpolation formula. This letter, however, shows how these coefficients can also be obtained by a simple classicalÂ¿ method that sets derivatives of a rational function to zero. View full abstract»

• ### F.M.-noise and bias-current fluctuations of a silicon Pd-n-p+ microwave oscillator

Publication Year: 1972, Page(s):158 - 159
Cited by:  Papers (2)
| | PDF (282 KB)

Fabrication of silicon Pd-n-p+ X band punchthrough transit-time diodes is described. A power output of 14 mW at 10.6 GHz has been obtained. Measurements of the f.m.-noise spectrum at maximum power output and the short-circuit-current noise are presented. At low modulating frequencies, the f.m. noise consists of unconverted current fluctuations. The f.m. single-sideband noise, 500 kHz off the carri... View full abstract»

• ### Application of the method of potential functions to fault diagnosis

Publication Year: 1972, Page(s):159 - 160
Cited by:  Papers (2)
| | PDF (287 KB)

A new technique for estimating parameter drift, based on the method of potential functions, is suggested. When one of the parameters has a very much larger drift than the others, thus constituting a fault, it has been found possible to isolate this parameter as the one with the largest estimated drift, even though the sensitivity functions associated with the parameters are not orthogonal. View full abstract»

• ### Apparent-mobility measurements corrected for liquid-motion effects

Publication Year: 1972, Page(s):160 - 161
| | PDF (293 KB)

An optical velocity-measurement probe has been incorporated into the normal mobility-measurement apparatus and the true value of negative-charge-carrier mobility in n hexane has been determined. View full abstract»

• ### Effects of semiuniform losses in reactance 2-ports

Publication Year: 1972, Page(s):161 - 163
Cited by:  Papers (6)
| | PDF (367 KB)

Antimetric reactance 2-ports are shown to be affected by uniform and semiuniform losses in the same way. This permits the uniform predistortion of an antimetric filter or an allpass network containing semiuniformly lossy elements. View full abstract»

• ### Rectangular backfire antenna with dielectric surface-wave structure

Publication Year: 1972, Page(s):163 - 165
Cited by:  Papers (3)
| | PDF (343 KB)

A rectangular backfire antenna with a dielectric surface-wave structure is studied experimentally and theoretically. It consists basically of two plane rectangular reflectors and a dielectric structure as a rectangular-waveguide prolongation. The antenna construction is compared with those of ordinary dielectric and horn antennas, which are more than twice the length of the backfire antenna. Simpl... View full abstract»

• ### Simple resonator method for measuring dispersion of microstrip

Publication Year: 1972, Page(s):165 - 166
Cited by:  Papers (5)
| | PDF (286 KB)

The method uses the resonant frequencies of a simple straight microstrip resonator, short-circuited at both ends. It is excited by passing a current through one of the short circuits. Graphs of effective relative permittivity against frequency are given for resonators on alumina and quartz substrates, with an error of within only Â±0.1%. View full abstract»

• ### High-efficiency c.w. operation of 'anomalous' indium-phosphide microwave oscillators

Publication Year: 1972, Page(s):166 - 168
Cited by:  Papers (4)
| | PDF (433 KB)

Improved c.w. performance of InP transferred-electron oscillators is reported over a frequency range of 13--27 GHz, with a best efficiency of 10% at 22 GHz. The current/voltage characteristics of these devices exhibit an anomalous behaviour whose temperature dependence is similar to that produced by an injecting barrier at the cathode contact. 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