Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 5, Issue 10, 15 May 1969
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Volume 5, Issue 10
15 May 1969
Cathodoluminescence of oxygen-implanted zinc-doped gallium phosphide
- Author(s): S.D. Lacey ; L.N. Large ; D.R. Wight
- Source: Electronics Letters, Volume 5, Issue 10, p. 203 –204
- DOI: 10.1049/el:19690153
- Type: Article
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p.
203
–204
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Oxygen has been introduced by ion implantation into zinc-doped epitaxial gallium phosphide grown from the vapour phase. After annealing, cathodoluminescence from zinc-oxygen pairs is observed, having an efficiency approaching that of bulk zinc-oxygen doped solution-grown material. For a zinc concentration of 2 × 1017cm−3, an optimum oxygen concentration for cathodoluminescence of 3 × 1018cm−3 is exhibited.
Technique for the measurement of the percentage of power in the single spurious mode of an overmoded waveguide
- Author(s): N.B. Saddler and J.A. Staniforth
- Source: Electronics Letters, Volume 5, Issue 10, p. 204 –206
- DOI: 10.1049/el:19690154
- Type: Article
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p.
204
–206
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A method is suggested, which uses a resonance technique, for measuring the percentage of power in the single spurious mode of an overmoded waveguide.
Distributed RC networks with rational immittances
- Author(s): K.J. Gough
- Source: Electronics Letters, Volume 5, Issue 10, p. 206 –207
- DOI: 10.1049/el:19690155
- Type: Article
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p.
206
–207
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The possibility of constructing distributed RC networks with rational immittances is shown to be independent of either the 'shape' of the network or the terminating impedances. A physical interpretation is given.
Realisation of nonuniform RC networks with rational admittances
- Author(s): K.J. Gough
- Source: Electronics Letters, Volume 5, Issue 10, p. 207 –208
- DOI: 10.1049/el:19690156
- Type: Article
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p.
207
–208
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A procedure is outlined whereby nonuniform RC networks with rational admittances can be realised. The method can be applied to any finite number of prescribed poles.
Enumeration of all cutsets of a graph
- Author(s): K.S. Rao ; V.V.B. Rao ; P. Sankaran ; V.G.K. Murti
- Source: Electronics Letters, Volume 5, Issue 10, page: 208 –208
- DOI: 10.1049/el:19690157
- Type: Article
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p.
208
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A computer program has been written which can be used for listing all the cutsets of a graph. The program can be applied to connected graphs having a maximum of 10 vertices and 20 edges.
Correction of a Smith-chart display through bilinear transformations
- Author(s): H.V. Shurmer
- Source: Electronics Letters, Volume 5, Issue 10, page: 209 –209
- DOI: 10.1049/el:19690158
- Type: Article
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209
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It is shown how the bilinear transforming properties of voltage reflection coefficients along a substantially lossless transmission-line system may be utilised in relation to online computer correction of a broadband Smith-chart display for transition and instrument errors.
Computer program to obtain the time response of sampled-data systems
- Author(s): S.E. Williamson
- Source: Electronics Letters, Volume 5, Issue 10, p. 209 –210
- DOI: 10.1049/el:19690159
- Type: Article
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209
–210
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A program is described which gives the sampled time response corresponding to any rational function F(z) expressed as the ratio of two polynomials.
Digital-filter frequency response
- Author(s): A.C. Davies
- Source: Electronics Letters, Volume 5, Issue 10, p. 210 –211
- DOI: 10.1049/el:19690160
- Type: Article
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210
–211
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The program calculates the magnitude and phase of the transfer function of a linear sampled-data system or digital filter, both with and without a zero-order-hold element present; the squared magnitude is printed out. The program may also be used to calculate the power spectrum of periodic discrete sequences and periodic waveforms, which can be produced from such sequences by passing them through a zero-order-hold element.
Delayed versions of linear sequences
- Author(s): A.C. Davies
- Source: Electronics Letters, Volume 5, Issue 10, page: 211 –211
- DOI: 10.1049/el:19690161
- Type: Article
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p.
211
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A program has been written which calculates the linear combination required to produce delayed versions of a maximal-length linear binary sequence. It can also be used if the modulus is greater than 2, and the sequence need not be of maximal length, provided that it is linear.
Second-order sensitivity analysis of a linear system
- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 5, Issue 10, p. 211 –212
- DOI: 10.1049/el:19690162
- Type: Article
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p.
211
–212
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The first-order Taylor-series approximation to the transfer function of a linear circuit in terms of the nominal component values and their deviations can be misleading for certain types of circuit. The second-order terms are now derived.
Second-order sensitivity analysis of a nonlinear system
- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 5, Issue 10, p. 212 –213
- DOI: 10.1049/el:19690163
- Type: Article
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p.
212
–213
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Second-order deviations, with respect to the deviations of component values and nonlinear parameters, are derived for the steady-state response of a nonlinear circuit to a periodic driving force.
Design of observers of reduced dynamics
- Author(s): S.D.G. Cumming
- Source: Electronics Letters, Volume 5, Issue 10, p. 213 –214
- DOI: 10.1049/el:19690164
- Type: Article
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p.
213
–214
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A simple method of designing a stable (n – m)-state observer for an n-state linear deterministic system with m independent outputs is presented.
Investigation of waveguide-below cutoff resonators for solid-state active devices
- Author(s): F. Ivanek ; M. Shyam ; V.G.K. Reddi
- Source: Electronics Letters, Volume 5, Issue 10, p. 214 –216
- DOI: 10.1049/el:19690165
- Type: Article
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214
–216
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The use of passbands below cutoff in waveguide structures for realisation of microwave circuits using active devices is reported. Experiments were performed on waveguide structures with cutoff frequencies of 14, 17, 21, 26 and 31GHz using Gunn and avalanche diodes. Mechanical tuning ranges of nearly 10% were obtained at frequencies in the lower half of Xband.
Frequency-modulation sensitivity of Gunn oscillators
- Author(s): E.A. Faulkner and M.L. Meade
- Source: Electronics Letters, Volume 5, Issue 10, p. 217 –218
- DOI: 10.1049/el:19690166
- Type: Article
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–218
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It is shown that, when Gunn oscillators are frequency-modulated by means of a small a.c. component superimposed on the bias supply, the resulting microwave-frequency deviation and the impedance presented by the diode to the modulation supply are dependent on the modulation frequency. The magnitudes of the frequency-modulation sensitivity and diode terminal impedance have been measured for modulation frequencies in the range 100Hz–100kHz.
Analogue-computer model for an avalanche-diode oscillator
- Author(s): M. Claassen and W. Harth
- Source: Electronics Letters, Volume 5, Issue 10, p. 218 –219
- DOI: 10.1049/el:19690167
- Type: Article
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p.
218
–219
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An analogue-computer model for an avalanche transit-time diode oscillator with single- and double-resonant circuit is described. Resonant responses of fundamental and subharmonic oscillations are discussed and compared with theory.
Intrinsic compensation of sidelobes in a dispersive acoustic delay line
- Author(s): P. Hartemann and E. Dieulesaint
- Source: Electronics Letters, Volume 5, Issue 10, p. 219 –220
- DOI: 10.1049/el:19690168
- Type: Article
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p.
219
–220
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It is shown that, in a delay line using Rayleigh waves, the amplitude and the delay as functions of frequency can be controlled independently of each other. The frequency/delay characteristic is controlled by the spacing of the fingers along the comb transducer; the amplitude response is controlled by varying the length of the fingers. This principle is illustrated with an example of a dispersive line where both the spacing and the length are varied to reduce the sidelobes to a level 28 dB below the main peak.
Stability of a sinusoidal-perturbation extremal-control system
- Author(s): D.J.G. James
- Source: Electronics Letters, Volume 5, Issue 10, p. 220 –222
- DOI: 10.1049/el:19690169
- Type: Article
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p.
220
–222
(3)
A theoretical stability analysis of a single-input sinusoidal-perturbation extremal-control system with output lag is considered. Periodic solutions of the system equations are obtained using the principle of harmonic balance, and their stability properties are investigated. The domains of attraction of the stable solutions are plotted to give the stability boundaries for the system.
Probability-density functions of digitally filtered msequences
- Author(s): A.C. Davies
- Source: Electronics Letters, Volume 5, Issue 10, p. 222 –224
- DOI: 10.1049/el:19690170
- Type: Article
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p.
222
–224
(3)
The letter discusses some properties of the probability-density function of waveforms obtained by summation of digits in an n-stage shift register which is generating an msequence of period 2n – 1 for m>n. The dependence of the function, not only on n and m but also on the particular msequence chosen, is demonstrated by a specific example.
Compensation of time delay and smoothing errors in hybrid computation loops
- Author(s): D. Duytschaever
- Source: Electronics Letters, Volume 5, Issue 10, p. 225 –226
- DOI: 10.1049/el:19690171
- Type: Article
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225
–226
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Three different methods to compensate for time-delay errors in hybrid loops are compared. Two of them, which are analogue, are found to be identical for all practical purposes. Normal digital compensation is found to be inferior. A modified simple digital compensation filter yields better performance.
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