Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 8, Issue 13, 29 June 1972
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Volume 8, Issue 13
29 June 1972
Superconducting-cavity-stabilised oscillator of high stability
- Author(s): S.R. Stein and J.P. Turneaure
- Source: Electronics Letters, Volume 8, Issue 13, p. 321 –323
- DOI: 10.1049/el:19720236
- Type: Article
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p.
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–323
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Superconducting Nb cavities of high Q factor have been used to stabilise Gunn-effect oscillators. These stabilised oscillators have given an r.m.s. frequency deviation σ(N = 2, r = 1.004, τ = 10) of (1.2±0.1)×10−13 for an averaging time of 10s.
Computational algorithm for the design of elliptic filters
- Author(s): R.N. Gadenz and G.C. Temes
- Source: Electronics Letters, Volume 8, Issue 13, p. 323 –324
- DOI: 10.1049/el:19720237
- Type: Article
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p.
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–324
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A simple and fast algorithm, based on the simultaneous cheby̅shev character of the passband and stopband characteristic, is presented for the computation of the transfer function of elliptic filters. The algorithm does not use elliptic functions; rather, a set of nonlinear equations is established and solved using Newton's method. Since useful initial approximations are easy to find, the solution requires only 2–4 iterations. The results are obtained directly in the transformed variable z and hence are immediately usable for computer-aided design.
Pole and zero assignment for linear multivariable systems using unity-rank feedback
- Author(s): F. Fallside and R.V. Patel
- Source: Electronics Letters, Volume 8, Issue 13, p. 324 –325
- DOI: 10.1049/el:19720238
- Type: Article
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–325
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The problem of synthetising a specified transfer function between an input-output pair by pole-zero assignment using unity-rank feedback is considered. Relationships are derived which show explicitly the effect of unity-rank feedback on the transfer function between a given input and output, and an algorithm is presented for approximating the desired transfer function in a recursive manner.
Decomposition method for earthed-capacitor active RC networks
- Author(s): J.M. Kelly and R.A. Stein
- Source: Electronics Letters, Volume 8, Issue 13, p. 325 –327
- DOI: 10.1049/el:19720239
- Type: Article
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–327
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A decomposition method is described for the synthesis of active RC networks having one terminal of every capacitor earthed. Application of the technique to three general synthesis methods is demonstrated.
Spectra of combined digital amplitude and frequency modulation
- Author(s): C.K. Chan and T.T. Tjhung
- Source: Electronics Letters, Volume 8, Issue 13, p. 327 –328
- DOI: 10.1049/el:19720240
- Type: Article
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–328
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Spectra of digital signals transmitted by combined amplitude and frequency modulation are derived. Cumulative spectral-distribution curves are presented for certain values of f.m. deviation and a.m. index, and the results are compared with biternary f.m. transmission.
Charge-coupled-device analogue matched filters
- Author(s): D.R. Collins ; W.H. Bailey ; W.M. Gosney ; D.D. Buss
- Source: Electronics Letters, Volume 8, Issue 13, p. 328 –329
- DOI: 10.1049/el:19720241
- Type: Article
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p.
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–329
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Charge-coupled-device shift registers are used to construct filters matched to both a 13-chip Barker-coded p-n sequence and a chirp signal with a time-bandwidth product of 10. The letter describes the design and fabrication of the devices, and presents preliminary operational characteristics of the filters. A 5 MHz chip rate for the Barker code filter is demonstrated
Equivalence of δ-function and equivalent-circuit models for interdigital acoustic-surface-wave transducers
- Author(s): R.F. Mitchell ; R.F. Mitchell ; N.H.C. Reilly
- Source: Electronics Letters, Volume 8, Issue 13, p. 329 –331
- DOI: 10.1049/el:19720242
- Type: Article
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It is demonstrated that a complete admittance matrix for an interdigital acoustic-surface-wave transducer can be obtained from a simple δ-function model, and that the results are entirely equivalent to those obtained from some of the widely used equivalent-circuit models
Multiloop mixer circuits
- Author(s): D.P. Howson
- Source: Electronics Letters, Volume 8, Issue 13, p. 331 –332
- DOI: 10.1049/el:19720243
- Type: Article
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It is shown that multiloop mixers using resistance diodes pumped at one frequency, but with various phases, have a minimum loss of 3 dB if the terminations are ‘broadband’, and if the circuit loops have self and mutual impedances which are pure resistances at the intermediate frequency. The latter condition prohibits phase shifters in the intermediate-frequency paths, and therefore implies that these are necessary in successful low-loss broadband mixers. It is further shown that, for the minimum loss of the mixer to approach 0 dB, the circuit must have image-rejection properties.
Acoustic-surface-wave recirculating memory
- Author(s): H. van de Vaart and L.R. Schissler
- Source: Electronics Letters, Volume 8, Issue 13, p. 333 –334
- DOI: 10.1049/el:19720244
- Type: Article
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An acoustic-surface-wave memory is described, operating at a bit rate of 220 MHz and storage capacity of 1280 bit per recirculation loop. The transducers are coded using orthogonal pairs of Golay complementary sequences to obtain pulse-in pulse-out behaviour. The recirculation electronics uses standard commercial logic for both the amplifier and the WRITE, READ, INHIBIT and RECLOCKING functions.
Partition methods for read-only-memory sequential machines
- Author(s): B.V. Howard
- Source: Electronics Letters, Volume 8, Issue 13, p. 334 –336
- DOI: 10.1049/el:19720245
- Type: Article
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p.
334
–336
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Partition methods have been developed in recent years as an aid to the state-assignment problem in synchronous sequential machines. Knowledge of the machine structure revealed by partitioning is shown to alllow considerable simplification when read-only memories are employed in such machines.
Transition from 2-dimensional line analysis to 1-dimensional model
- Author(s): B. Bianco and S. Ridella
- Source: Electronics Letters, Volume 8, Issue 13, p. 336 –337
- DOI: 10.1049/el:19720246
- Type: Article
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p.
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The transition from 2-dimensional line analysis to the 1-dimensional model is examined on the basis of a suitable series expansion of the voltage equation. It is shown that 1-dimensional equations can be derived from a 2-dimensional analysis with proper approximations for certain operators. A consistence procedure is outlined and applied to an exponential taper.
Analytical expressions for carrier distribution in a wide thyristor base under high injection
- Author(s): M. Lietz
- Source: Electronics Letters, Volume 8, Issue 13, p. 337 –339
- DOI: 10.1049/el:19720247
- Type: Article
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p.
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–339
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For calculating the carrier distribution in the base of a wide thyristor, the dependency of the ambipolar mobility on the carrier concentration and the influence of current are taken into account to obtain analytical approximations which are useful as a start for an exact computer solution.
Design of optimal-control systems with prescribed closed-loop poles
- Author(s): R.J. Widodo
- Source: Electronics Letters, Volume 8, Issue 13, p. 339 –340
- DOI: 10.1049/el:19720248
- Type: Article
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p.
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A new design procedure for linear systems is proposed to find the feedback vector and the weighting matrix of a quadratic performance index, which can be directly determined by the characteristic equations of the open- and closed-loop system, in order that the performance index is minimised and that the closed-loop system can achieve a set of prescribed poles.
Effect of dielectric film on nonlinear surface mixing
- Author(s): W.W. Sheng and C.R. Westgate
- Source: Electronics Letters, Volume 8, Issue 13, p. 341 –342
- DOI: 10.1049/el:19720249
- Type: Article
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By considering a coupled 3-wave interaction process, the effect of a dielectric film on nonlinear surface mixing has been discussed. It is found that, for very strong pump intensity and properly-chosen material, the film can enhance parametric conversion at the surface of some crystals.
Surface waves in the corrugated conical horn
- Author(s): J.K.M. Jansen and M. Jeuken
- Source: Electronics Letters, Volume 8, Issue 13, p. 342 –344
- DOI: 10.1049/el:19720250
- Type: Article
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p.
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–344
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An investigation of the existence of surface waves has been carried out. The conclusion is that surface waves can propagate in such a structure provided that the depth of the grooves is less than one-quarter of a wavelength.
Erratum: Optimum control of linear systems in the presence of polynomial or sinusoidal disturbances
- Author(s): F.D. Galiana
- Source: Electronics Letters, Volume 8, Issue 13, page: 344 –344
- DOI: 10.1049/el:19720251
- Type: Article
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