Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 9, Issue 12, 14 June 1973
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Volume 9, Issue 12
14 June 1973
Extension of the moment-analysis method for statistical analysis to include linear-correlation effects
- Author(s): B.J. Hagan and J.A. Magowan
- Source: Electronics Letters, Volume 9, Issue 12, p. 261 –262
- DOI: 10.1049/el:19730190
- Type: Article
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p.
261
–262
(2)
A technique for extending the moment-analysis method for statistical analysis to include linear-correlation effects is presented. This technique has the advantage of being significantly faster than previous methods for treating linear-correlation effects. Included is an example of the effect of linear correlation between load and driver devices on the probability-density function of the output voltage of an m.o.s.t. integrated invertor.
Use of unity-rank output feedback to guide the selection of feedback coefficients
- Author(s): R.S. Hannah and D.H. Mee
- Source: Electronics Letters, Volume 9, Issue 12, p. 263 –264
- DOI: 10.1049/el:19730191
- Type: Article
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p.
263
–264
(2)
The use of dyadic feedback to simplify matrix manipulations in multivariable-control-system design has been recognised. Some of these results are combined in a root-locus procedure to give positive guidance in the selection of feedback coefficients.
Integral equation for the potential distribution in a Hall generator
- Author(s): G. de Mey
- Source: Electronics Letters, Volume 9, Issue 12, p. 264 –266
- DOI: 10.1049/el:19730192
- Type: Article
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p.
264
–266
(3)
It is proved that the potential distribution in a Hall generator is also given as the electrostatic potential caused by a fictitious charge distribution along the boundary. The problem is then reduced to an integral equation, which is easily solved on a digital computer.
Series expansion for two input describing functions
- Author(s): D.P. Atherton
- Source: Electronics Letters, Volume 9, Issue 12, p. 266 –267
- DOI: 10.1049/el:19730193
- Type: Article
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p.
266
–267
(2)
The letter shows that, by using a Taylor-series expansion for a single-valued nonlinear characteristic, expressions for its two input describing functions can be obtained as infinite series. The method is applicable to sinusoidal or Gaussian inputs in the presence of any other independent signal with a known probability-density function.
Zero-voltage detection in thyristor and triac convertors
- Author(s): R.M. Davis and B.R. Downing
- Source: Electronics Letters, Volume 9, Issue 12, p. 267 –268
- DOI: 10.1049/el:19730194
- Type: Article
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p.
267
–268
(2)
A sensitive voltage (zero-crossing) detector for a thyristor/triac is described. An optically coupled isolator (o.c.i.) has its light-emitting diode supplied from a constant-current source, and a pair of transistors bypass this current when there is sufficient voltage across the power device. The pulse output of the o.c.i. is sufficiently sharp to drive the logic circuit directly.
X band c.w. TRAPATT oscillators using ring diodes on diamond heat spreaders
- Author(s): N.W. Cox ; K.E. Gsteiger ; G.N. Hill ; C.T. Rucker
- Source: Electronics Letters, Volume 9, Issue 12, p. 269 –270
- DOI: 10.1049/el:19730195
- Type: Article
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p.
269
–270
(2)
TRAPATT diodes for X band c.w. operation have been made using both double-epitaxy and diffusion techniques. These p+nn+ devices are fabricated in ring configurations and mounted on type-IIA diamond heat spreaders. A c.w. TRAPATT performance of 3.3 W and 18.5% efficiency has been achieved at 8 GHz using these diodes.
Dual-observer design procedure
- Author(s): P. Murdoch
- Source: Electronics Letters, Volume 9, Issue 12, p. 270 –271
- DOI: 10.1049/el:19730196
- Type: Article
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p.
270
–271
(2)
A procedure is described for the design of a dual observer of order (q−1), for a linear system of order n, where q is the controllability index. All (n+q−1) poles of the composite system may be assigned arbitrary values.
Digital-filter 2nd-order element with low quantising noise for poles and zeros at low frequencies
- Author(s): N.G. Kingsbury
- Source: Electronics Letters, Volume 9, Issue 12, p. 271 –273
- DOI: 10.1049/el:19730197
- Type: Article
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p.
271
–273
(3)
A 2nd-order recursive digital-filter element is proposed that gives an appreciable reduction in signal quantising noise and coefficient sensitivity compared with the direct or canonic forms of filter element when the poles or the zeros are near the point Z= 1+0j. This is a modificalion to a previously published 2nd-order element that only gives an improvement when the poles are near the point Z=1+0j.
Effects of nonuniform doping on generation-lifetime measurement in m.o.s. capacitors
- Author(s): P.U. Calzolari ; S. Graffi ; C. Morandi
- Source: Electronics Letters, Volume 9, Issue 12, p. 273 –274
- DOI: 10.1049/el:19730198
- Type: Article
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p.
273
–274
(2)
A theoretical investigation of the transient behaviour of an m.o.s. capacitor pulsed into inversion shows that current and capacitance measurements provide a reliable method for the evaluation of the bulk generation lifetime, even in the presence of moderately nonuniform doping concentrations.
Input impedance of a circulator with an inphase eigen-excitation resonator
- Author(s): Y. Akaiwa
- Source: Electronics Letters, Volume 9, Issue 12, p. 274 –275
- DOI: 10.1049/el:19730199
- Type: Article
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p.
274
–275
(2)
The input impedance of a circulator with an inphase eigen excitation resonator can be expressed by that of a 2-stage bandpass filter. The external Q factor of an inphase eigenexcitation resonator should be three-quarters that of rotational-phase eigen-excitation resonators to obtain a maximally fiat performance.
Bragg imaging of high-frequency sound fields
- Author(s): J.M. Rouvaen ; N. Gremillet ; M. Delannoy ; E. Bridoux ; R. Torguet
- Source: Electronics Letters, Volume 9, Issue 12, p. 275 –276
- DOI: 10.1049/el:19730200
- Type: Article
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p.
275
–276
(2)
The letter presents the results of a Bragg-imaging experiment involving acoustic fields in the 150–300 MHz frequency range. Future applications of such a probing tool are devised.
Cooley-Tukey-type algorithm for the Haar transform
- Author(s): N. Ahmed ; T. Natarajan ; K.R. Rao
- Source: Electronics Letters, Volume 9, Issue 12, p. 276 –278
- DOI: 10.1049/el:19730201
- Type: Article
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p.
276
–278
(3)
It is shown that the Haar transform can be computed using a Cooley-Tukey-type algorithm that is implemented in 2(N−1) additions/subtractions. This algorithm is derived by relating the Haar transform to the modified Walsh-Hadamard transform using a simple bit-reversal scheme.
Microwave loss measurement
- Author(s): R.A. Court
- Source: Electronics Letters, Volume 9, Issue 12, p. 278 –279
- DOI: 10.1049/el:19730202
- Type: Article
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p.
278
–279
(2)
A simple and convenient technique is given for the determination of losses in microwave circuits. The technique uses a transformation from measurements made on a mismatched transmission line to the actual dissipative losses in a matched system. These measurements are then compared with theoretical calculations.
GaP electroluminescent memory switch
- Author(s): S.Y. Haeri
- Source: Electronics Letters, Volume 9, Issue 12, p. 279 –280
- DOI: 10.1049/el:19730203
- Type: Article
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p.
279
–280
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M.I.S. structures in which the semiconductor is GaP and the insulator a native oxide of GaP exhibit switchtng and non volatile memory properties as well as electroluminescence that is green under forward bias and orange under reverse bias. The switching and memory properties are thought to be due to a forming process in the oxide layer.
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