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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 9, Issue 18, 6 September 1973

Volumes & issues:

Volume 9, Issue 18

6 September 1973

Low-noise silicon IMPATT structure
Viscous dielectric materials for application in microwave microcircuits
  • Author(s): T.C. Edwards
  • Source: Electronics Letters, Volume 9, Issue 18, p. 406 –407
  • DOI:  10.1049/el:19730299
  • Type: Article
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  • p. 406 –407 (2)
    Viscous dielectric materials made from mixtures of titania and Vaseline cover the relative-permittivity range from approximately 4 to 30. The main application is in experiments with microwave microcircuits. Measurements are reported using a resonance method with a cavity developed for this work. A previously quoted expression, giving mixture relative permittivity as a function of its component relative permittivities and their proportions, is shown to hold for this case.
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Double-resonance bridge
Sampling phase rotator for removal of Doppler shift in a lunar radar
Serial residue generator for use in a self-checking computer
Mode excitation in a multimode optical-fibre waveguide
Model of a metal-oxide-silicon transistor operating in the saturation region
  • Author(s): P. Rossel  and  H. Martinot
  • Source: Electronics Letters, Volume 9, Issue 18, p. 414 –416
  • DOI:  10.1049/el:19730304
  • Type: Article
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  • p. 414 –416 (3)
    The output resistance of an m.o.s. transistor operating in the saturation region is studied experimentally and theoretically. New experimental properties of the ‘resistance–current’ product are described. A model is proposed in which the structure is divided into two sections. In the source section, a gradual length approximation is assumed, taking into account the mobility–field dependence; while in the drain section, the mobile-carrier charge is included in the ‘equivalent doping’. The continuity conditions between the two regions are described. Good agreement is found between the theory and the experimental results.
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State-assignment technique for synchronous sequential machines
  • Author(s): B. Dervisoglu
  • Source: Electronics Letters, Volume 9, Issue 18, p. 416 –417
  • DOI:  10.1049/el:19730305
  • Type: Article
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  • p. 416 –417 (2)
    The letter presents a new state-assignment technique for synchronous sequential machines. The method makes use of the shortest clearing sequence of each state in assigning a binary code for that state. A clearing sequence is defined as a sequence of inputs which will bring a sequential machine to the same predefined state, no matter which state the sequential machine starts from. The method of state assignment described in the letter shows the shift-register properties of the sequential machine. The stronger these properties are, the simpler the realisation.
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Generation of Bleustein–Gulyaev and bulk-shear waves by interdigital transducers on a piezoelectric ceramic
Generation of Rayleigh and bulk waves by interdigital transducers on y-cut z-propagating lithium niobate
  • Author(s): N.H.C. Reilly ; R.F. Milsom ; M. Redwood
  • Source: Electronics Letters, Volume 9, Issue 18, p. 419 –420
  • DOI:  10.1049/el:19730307
  • Type: Article
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  • p. 419 –420 (2)
    Theoretical predictions are made of the generation of Rayleigh bulk-shear and bulk-longitudinal waves by interdigital transducers on y-cut z-propagating lithium niobate. Frequency response and bulk-wave radiation patterns are compared with experimental evidence, and the proportions of input power converted to the three modes are shown as functions of both frequency and number of finger pairs.
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Power-generation potential of various IMPATT structures from a scaling approximation
Simple evaluation of the matrix T that relates two equivalent Foster networks
Experimental determination of attenuation in corrugated circular waveguides
  • Author(s): A.D. Olver ; P.J.B. Clarricoats ; S.L. Chong
  • Source: Electronics Letters, Volume 9, Issue 18, p. 424 –426
  • DOI:  10.1049/el:19730310
  • Type: Article
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  • p. 424 –426 (3)
    The attenuation of the HE11 mode in a brass corrugated circular waveguide of internal diameter 8 cm is measured in the frequency range 8–10 GHz by means of a resonant-cavity technique. Attenuation values of the order of 4 dB/m are observed. The mean attenuation level exceeds the theoretical value for a perfect corrugated waveguide by about 25%, which is within the experimental accuracy. The attenuation measured is substantially less than that predicted for the H11 mode in a smooth-wall waveguide of comparable size and is, in fact, close to that predicted for the H01 mode.
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Volterra kernels in nonlinear systems
Possible improvement in television-signal prediction due to interframe correlation
Design of a circulating-type analogue–digital convertor using bucket-brigade delay lines
  • Author(s): A. Werenko  and  J.C. Majithia
  • Source: Electronics Letters, Volume 9, Issue 18, p. 428 –430
  • DOI:  10.1049/el:19730313
  • Type: Article
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  • p. 428 –430 (3)
    A hardware implementation of a circulating-type analogue–digital convertor using bucket-brigade delay lines (b.b.d.l.) is described. The b.b.d.l. used is a 32-stage commercially available device. This large number of stages is not necessary, and, in practice, a b.b.d.l. with two or three stages would be satisfactory. Such an analogue–digital convertor can be implemented economically, and would be able to convert input signals in the frequency range 0–500 kHz. The principal advantage in using the b.b.d.l. is in the reduction of the number of analogue switches required. Experimental results show that 4–6 bit conversion is readily achieved, although a compensator network to compensate for the b.b.d.l. losses is required.
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Linear and nonlinear high-quality synthetic inductors
m=0, n=0 mode and rectangular-waveguide slot discontinuity
Nonsymmetrical multistrip coupler as a surface-wave beam compressor of large bandwidth
  • Author(s): C. Maerfeld  and  G.W. Farnell
  • Source: Electronics Letters, Volume 9, Issue 18, p. 432 –434
  • DOI:  10.1049/el:19730316
  • Type: Article
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  • p. 432 –434 (3)
    The equations for the performance of a multi strip coupler, in which the two tracks involved are of different geometries and acoustic characteristics, are presented in a convenient form that includes the effects of the strip length between the two tracks. Using this analysis, a beamwidth compressor, in which the trackwidths differ by a factor of ten, has been designed and constructed. Since the energy transfer from one track to the other is complete, the energy density in the acoustic beam is increased by a factor of ten over a very large operating bandwidth.
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Maximum Q factors for bandpass filters
Erratum: Effects of binary quantisation when using the fast Fourier transform to compute power spectral estimates

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