Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 2, Issue 5, May 1966
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Volume 2 (1966)
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Volume 1 (1965)
Volume 2, Issue 5
May 1966
Transistor invertors for low-voltage thermoelectric generators
- Author(s): E.A. Faulkner and R. Tring
- Source: Electronics Letters, Volume 2, Issue 5, p. 161 –162
- DOI: 10.1049/el:19660133
- Type: Article
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p.
161
–162
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A transistor invertor is described which gives over 80 % efficiency for a source voltage of 400 mV, as compared with the 44 % recently reported for a tunnel-diode invertor.
Response of a varactor frequency doubler to amplitude- and phase-modulated signals
- Author(s): H.B. Wood and C. Mok
- Source: Electronics Letters, Volume 2, Issue 5, p. 162 –164
- DOI: 10.1049/el:19660134
- Type: Article
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p.
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–164
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The response of a varactor frequency doubler to amplitude- and phase-modulated signals has been examined, and power gains of one and four have been obtained for the two types of modulation. An example of the amplitude linearity of a varactor multiplier is indicated by means of oscillograms.
Elimination of the effect of nonlinearities on process crosscorrelations
- Author(s): A.B. Gardiner
- Source: Electronics Letters, Volume 2, Issue 5, p. 164 –165
- DOI: 10.1049/el:19660135
- Type: Article
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p.
164
–165
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An analysis is presented which shows how the small-signal gain of a continuous single-valued nonlinear process can be derived from large-signal crosscorrelations. In particular, it is shown how the technique can be used to overcome difficulties that arise when identifying nonlinear processes with a pseudorandom binary-sequence input.
Stability analysis of constant linear systems by Lyapunov's second method
- Author(s): S. Barnett and C. Storey
- Source: Electronics Letters, Volume 2, Issue 5, p. 165 –166
- DOI: 10.1049/el:19660136
- Type: Article
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165
–166
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The stability of ẋ = Ax can be determined by solving the matrix equation A'B + BA = — C, which represents ½n(n + 1) linear eiquations for the ½n(n + 1) elements of the symmetric n × n matrix B. It is shown that the number of equations to be solved can be reduced by n.
Fluctuations of secondary-particle numbers in a multiplication process
- Author(s): R.E. Burgess and L. Scott
- Source: Electronics Letters, Volume 2, Issue 5, p. 166 –167
- DOI: 10.1049/el:19660137
- Type: Article
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–167
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The multiplicative process in which incident primary particles produce secondary particles is discussed statistically. The variance of the number of secondaries is shown to depend on the mean values and variances of the number of primaries and of the multiplication. The result is essentially different in form from that applicable when the input and output variables and the multiplication are continuous.
Wave propagation in nonlinear transmission lines with simple losses
- Author(s): D.T. Bickley
- Source: Electronics Letters, Volume 2, Issue 5, p. 167 –169
- DOI: 10.1049/el:19660138
- Type: Article
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167
–169
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Heaviside's condition for distortionless wave propagation in linear transmission lines with losses is generalised to cover nonlinear transmission lines. Analytical expressions are given for voltage and current in these lines.
Three-stage time-division switching network with pulse-shifting junctor as alternate route
- Author(s): H. Inose ; T. Saito ; M. Kato
- Source: Electronics Letters, Volume 2, Issue 5, p. 169 –170
- DOI: 10.1049/el:19660139
- Type: Article
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169
–170
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The configuration of a 3-stage time-division switching network which has pulse-shifting junctors as the alternate route as well as direct junctors is proposed. A computer simulation to estimate the blocking probability of the system is performed, and proves the system to be nearly as efficient as the switching network without time-slot mismatch loss.
Variational integral for arbitrary inhomogeneous isotropic waveguides
- Author(s): C.D. Hannaford
- Source: Electronics Letters, Volume 2, Issue 5, p. 170 –171
- DOI: 10.1049/el:19660140
- Type: Article
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–171
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A variational integral is proposed, from which it is possible to calculate the propagation coefficient of an arbitrary inhomogeneous waveguide containing isotropic material. The stationary nature of the integral is proved, and some of its properties are discussed.
Bouncing-ball pulse generator
- Author(s): J.B. Gunn
- Source: Electronics Letters, Volume 2, Issue 5, p. 172 –173
- DOI: 10.1049/el:19660141
- Type: Article
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172
–173
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A technique is described for the generation of 1.5 kV 200 ps pulses in a 50Ω system. The switching action is controlled by bouncing a hard steel ball between contacts.
Spatial periodic modulation of the high-field domain in cadmium sulphide
- Author(s): W.H. Haydl
- Source: Electronics Letters, Volume 2, Issue 5, page: 173 –173
- DOI: 10.1049/el:19660142
- Type: Article
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It is shown that there exists a maximum oscillation frequency for the current oscillations in semiconducting CdS. Below the corresponding minimum sample length, current oscillations do not exist. This maximum oscillation frequency may be exceeded with long samples by modulating the electric field along the sample. The technique presented is applicable to transferred-electron devices.
Comment: Use of pseudorandom binary sequences in the digital simulation of control systems subjected to random input signals
- Author(s): R.F. Brown and P.D. Roberts
- Source: Electronics Letters, Volume 2, Issue 5, p. 173 –174
- DOI: 10.1049/el:19660143
- Type: Article
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–174
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Liquid-filled electrostatic generator
- Author(s): J.F. Hughes and P.E. Secker
- Source: Electronics Letters, Volume 2, Issue 5, p. 174 –175
- DOI: 10.1049/el:19660144
- Type: Article
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p.
174
–175
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In initial experiments on a liquid-filled generator, voltages up to 70 kV have been realised. The liquid dielectric is pumped around a closed-loop system and acts both as a charge-transporting medium and an insulator. The charge is injected into the liquid from field-emitting electrodes.
Ultrashort electromagnetic waves from arc discharges at the plasma frequency and its second harmonic
- Author(s): N. Ben-Yosef and A.S. Kaufman
- Source: Electronics Letters, Volume 2, Issue 5, p. 175 –177
- DOI: 10.1049/el:19660145
- Type: Article
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–177
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The radiation detected at four discrete frequency bands from the positive column in argon at low pressure is compatible with that from a source comprising two modes of plasma waves—oscillations of a plasma plate and cylinder.
Interference between terrestrial line-of-sight radio-relay systems and communication-satellite systems
- Author(s): P.B. Johns
- Source: Electronics Letters, Volume 2, Issue 5, p. 177 –178
- DOI: 10.1049/el:19660146
- Type: Article
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p.
177
–178
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A graphical method for obtaining transfer factors for interference problems involving wide-deviation frequency-modulated satellite systems is extended to problems involving interference between line-of-sight radio-relay systems and unloaded and undispersed satellite systems. Interference problems involving single-sideband amplitude-modulated systems are also considered.
Two-dimension diffraction by slits or strips
- Author(s): R. Mittra and A. Neureuther
- Source: Electronics Letters, Volume 2, Issue 5, p. 178 –179
- DOI: 10.1049/el:19660147
- Type: Article
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–179
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Approximate methods for calculating multiple-diffraction losses
- Author(s): K. Hacking
- Source: Electronics Letters, Volume 2, Issue 5, p. 179 –180
- DOI: 10.1049/el:19660148
- Type: Article
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–180
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Keller's geometrical theory of diffraction applied to multiple diffraction leads to useful formulas and supports a general construction, already proposed, for estimating the total diffraction loss. The theory gives a result for two knife edges in tandem which is shown to be equivalent to that obtained by the Epstein–Peterson method plus Millington's correction.
PLUGE method of adjusting picture monitors in television studios
- Author(s): S.F. Quinn and C.A. Siocos
- Source: Electronics Letters, Volume 2, Issue 5, p. 180 –181
- DOI: 10.1049/el:19660149
- Type: Article
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–181
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The PLUGE method is described, and its advantages are given. Five sets of reference conditions for setting up picture monitors are presented. Further, it is shown that the required PLUGE black level is dependent upon the value of base luminance.
Exact formulation for axial spinwave propagation in a constant magnetic-field gradient
- Author(s): J.H. Collins and G.G. Neilson
- Source: Electronics Letters, Volume 2, Issue 5, p. 181 –182
- DOI: 10.1049/el:19660150
- Type: Article
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p.
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–182
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The differential equation is solved for the magnetisation of a lossfree one-dimensional spinwave packet, travelling under a constant magnetostatic-field gradient, in a single-crystal ferrimagnetic. Expressions are derived for the stored energy, power flux, phase and energy velocities and time delay. The asymptotic time delay is compared with the harmonic-wave approximation, and it is concluded that for rod geometries the greatest deviation occurs close to the end face.
Effect of an anode hole on electron avalanches in methane at high pressure
- Author(s): A.H. Cookson
- Source: Electronics Letters, Volume 2, Issue 5, p. 182 –184
- DOI: 10.1049/el:19660151
- Type: Article
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182
–184
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Measurements of the growth and size distribution of electron avalanches have been made in methane gas, over a pressure range from a few torr to 14 atm absolute, which show that field distortion due to a hole in the anode influences the growth of avalanches occurring at high gas pressures and at values of electrode separation ≤ 0.5 cm. The degree of influence depends on the size of the anode hole and on the value of E/p0.
Formation and duration of shock waves in nonlinear lines
- Author(s): A.R. Owens and G. White
- Source: Electronics Letters, Volume 2, Issue 5, p. 184 –185
- DOI: 10.1049/el:19660152
- Type: Article
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–185
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The formation of very short-risetime pulses is considered in nonlinear delay lines employing reverse-biased diodes. Simple expressions for the growth and duration of the shock-wave fronts are obtained, and their validity is confirmed by experimental results.
Continuously variable delay lines
- Author(s): A.R. Owens and G. White
- Source: Electronics Letters, Volume 2, Issue 5, p. 185 –186
- DOI: 10.1049/el:19660153
- Type: Article
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–186
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Two types of nonlinear delay line employing variable-capacitance diodes are described. The delays of both lines vary from 9 ns to 15 ns. The pulse risetimes of the two types of lines are considered.
Active all-pass filter using differential amplifier
- Author(s): I.F. MacDiarmid
- Source: Electronics Letters, Volume 2, Issue 5, page: 186 –186
- DOI: 10.1049/el:19660154
- Type: Article
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The relationship between a recently described active all-pass filter using a differential amplifier and one described in an earlier paper is discussed. A method of using either circuit to produce an all-pass function of any degree is also indicated.
Determination of F(s) from given phase response θ(ω)
- Author(s): Sid Deutsch
- Source: Electronics Letters, Volume 2, Issue 5, page: 187 –187
- DOI: 10.1049/el:19660155
- Type: Article
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187
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A convenient method of determining the minimum-phase network function F(s) from a given phase response θ(ω) is based on a relationship between d(log F)/ds and dθ/dω. Two illustrative examples are considered.
Self-adjusting orthogonal digital filter for identification of unknown processes
- Author(s): P.D. Roberts
- Source: Electronics Letters, Volume 2, Issue 5, p. 187 –188
- DOI: 10.1049/el:19660156
- Type: Article
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p.
187
–188
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A digital filter with independent adjustable parameters which may be used for online identification of linear or nonlinear unknown processes is described. Algorithms for constructing the components of the filter and computing the optimum values of the adjustable parameters are given.
Erratum: New analogue multiplier-divider
- Author(s): A. Grasselli and R. Stephanelli
- Source: Electronics Letters, Volume 2, Issue 5, page: 188 –188
- DOI: 10.1049/el:19660157
- Type: Article
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Erratum: Comparison of three simple field-effect-transistor models
- Author(s): J.S. Lamming
- Source: Electronics Letters, Volume 2, Issue 5, page: 188 –188
- DOI: 10.1049/el:19660158
- Type: Article
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