Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 7, Issue 7, 8 April 1971
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Volume 7, Issue 7
8 April 1971
Linear amplification using envelope feedback
- Author(s): T. Arthanayake and H.B. Wood
- Source: Electronics Letters, Volume 7, Issue 7, p. 145 –146
- DOI: 10.1049/el:19710093
- Type: Article
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An envelope-feedback technique applicable for reducing the distortion of amplitude-modulated signals in transistor amplifiers is described. The basis of the technique is to compare the input and output signals, and to introduce a correction signal into the circuit. An analysis and experimental results are provided.
Tunable Gunn oscillator by semiconductor surface loading
- Author(s): J.L. Teszner
- Source: Electronics Letters, Volume 7, Issue 7, p. 146 –148
- DOI: 10.1049/el:19710094
- Type: Article
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A tunable and amplitude-modulated Gunn oscillator is obtained by semiconductor surface loading. The load is partial and covers the cathode. The oscillation frequency depends on the distance X between the anode and the edge of the surface-loading semiconductor and can be varied continuously over a range of about 6:1. As X approaches zero, an amplitude-modulated pulse is obtained. These effects may be explained by the coexistence of two high-field regions in the structure. The method also gives a measure of the domain-growth time.
Zero-point fluctuations and thermal-noise standards
- Author(s): I.A. Harris
- Source: Electronics Letters, Volume 7, Issue 7, p. 148 –149
- DOI: 10.1049/el:19710095
- Type: Article
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–149
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It is concluded that the expression for the available noise power should include only the ‘thermal-noise’ term, the ‘quantum-noise’ term being associated with the detector or receiver. Statements of the relationship found in the literature require such a convention to permit unequivocal application of microwave-network analysis to noise-measurement problems.
Elliptic resonator and its use in microcircuit systems
- Author(s): R.T. Irish
- Source: Electronics Letters, Volume 7, Issue 7, p. 149 –150
- DOI: 10.1049/el:19710096
- Type: Article
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The principal modes of an elliptic resonator have been obtained experimentally and have been shown to be consistent with the limited available theoretical results. A skeleton mode chart constructed from these data indicates that the system has considerable potential for harmonic-multiplier and parametric-amplifier applications.
InP pulsed and c.w. millimetre-wave oscillators
- Author(s): G. Gibbons and P.M. White
- Source: Electronics Letters, Volume 7, Issue 7, p. 150 –151
- DOI: 10.1049/el:19710097
- Type: Article
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InP 3-level oscillators have been operated under c.w. and pulse-bias conditions in the frequency range 30–40 GHz with power outputs of up to 7.5 mW and 240 mW, respectively. C.W. power is also obtained at frequencies above 40 GHz.
Amplitude stabilisation of a varactor frequency multiplier using self-bias resistance compensation
- Author(s): C.D. Corbey and R. Davies
- Source: Electronics Letters, Volume 7, Issue 7, p. 151 –152
- DOI: 10.1049/el:19710098
- Type: Article
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–152
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A simple method of stabilising the output power of a self-biased varactor frequency multiplier is described. The technique is applied to a 9–36 GHz quadrupler and the output power is shown to vary by less than 0.1 dB for a 3 dB variation in r.f. drive level.
Frequency stabilisation of a reflex-klystron oscillator by a superconducting cavity
- Author(s): J.J. Jimenez ; P. Sudraud ; A. Septier
- Source: Electronics Letters, Volume 7, Issue 7, p. 153 –154
- DOI: 10.1049/el:19710099
- Type: Article
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A powerful X band oscillator is reported, with a frequency stability comparable to a quartz clock of high quality. It is realised by coupling externally a standard reflex klystron 2K 25 to a high-Q factor (108) superconducting cavity. The observed frequency standard deviations in one second (10−10 in relative value) are in accordance with the theory.
Large-signal theory for rectangular-voltage operation of a uniform avalanche zone in IMPATT diodes
- Author(s): F. Sellberg
- Source: Electronics Letters, Volume 7, Issue 7, p. 154 –156
- DOI: 10.1049/el:19710100
- Type: Article
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Explicit solutions are derived for the currents in a lightly doped high-field zone of an IMPATT diode subject to constant E field avalanche. Resulting particle-current waveforms, diode impedances and r.f. powers are calculated for Si and GaAs with the avalanche period followed by a sudden transition to a low-voltage carrier-extraction period. It is concluded that the addition of a drift zone will only ease impedance matching and enhance efficiency when differences of either ionisation rates or drift velocities between electrons and holes exist.
Concerning the electric strength of solid argon
- Author(s): T.J. Gallagher
- Source: Electronics Letters, Volume 7, Issue 7, p. 156 –157
- DOI: 10.1049/el:19710101
- Type: Article
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Measurements are presented of induced ionisation currents in solid argon, which indicate that the differences in recently reported values of its electric strength may be attributed to different techniques of crystal growth.
Sensitivity calculations of ladder networks by using continuants
- Author(s): Y. Ceyhun
- Source: Electronics Letters, Volume 7, Issue 7, p. 157 –158
- DOI: 10.1049/el:19710102
- Type: Article
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Certain network functions of ladder networks are formulated by using continuants, and closed-form formulas are given for their sensitivities.
Extension to the method of Anderson and Luenberger for eigenvalue assignment
- Author(s): H.M. Power
- Source: Electronics Letters, Volume 7, Issue 7, p. 158 –160
- DOI: 10.1049/el:19710103
- Type: Article
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A method is described which allows the canonical decomposition of Anderson and Luenberger to be employed systematically for eigenvalue assignment in linear multivariable systems in cases where their method cannot be applied directly, or where one wishes to exploit extra design freedom.
Current-induced resistor noise not attributable entirely to fluctuations of conductivity
- Author(s): H. Sutcliffe
- Source: Electronics Letters, Volume 7, Issue 7, p. 160 –161
- DOI: 10.1049/el:19710104
- Type: Article
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p.
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Measurements of the noise spectra of carbon-rod resistors were made using two types of applied current, direct and sinusoidal at 10 kHz. The spectral intensities at corresponding frequencies indicate that, for some samples, the spectrum with direct current is only partially attributable to fluctuations of conductivity.
Noise in IMPATT oscillator at large r.f. amplitudes
- Author(s): A. Sjölund
- Source: Electronics Letters, Volume 7, Issue 7, p. 161 –162
- DOI: 10.1049/el:19710105
- Type: Article
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The noise-current generator of a large-signal IMPATT oscillator is shown to be inversely proportional to the avalanche starting current. This is verified by a numerical study of a large-signal model of an IMPATT oscillator.
Transistor S parameter measurement: corrections for 2-port common-electrode impedance and the corresponding 2-port to 3-port transforms
- Author(s): D. Woods
- Source: Electronics Letters, Volume 7, Issue 7, p. 162 –163
- DOI: 10.1049/el:19710106
- Type: Article
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In 2-port transmission-parameter measurements on active devices, a residual common-electrode impedance can cause serious errors, particularly in the common-emitter configuration. Transforms are given which enable the true S parameters to be derived in terms of the measured parameters and the common-electrode impedance. It is shown that the inverses of these transforms can be used to derive the 3-port S parameters in terms of measured 2-port values. It is also shown that a unique relationship exists between the 2-port driving-point s parameters in the three configurations, which can be used as a partial check on system accuracy without the need for transformation to 3-port parameters.
Simple proof of the Hsu-Chen theorem
- Author(s): B. Porter
- Source: Electronics Letters, Volume 7, Issue 7, p. 163 –164
- DOI: 10.1049/el:19710107
- Type: Article
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The paper presents a simple proof of the Hsu-Chen theorem for multivariable linear control systems incorporating proportional control and unity feedback.
Erratum: Calculation of steady-state response of linear system to periodic sampled signal
- Source: Electronics Letters, Volume 7, Issue 7, page: 164 –164
- DOI: 10.1049/el:19710108
- Type: Article
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p.
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