Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 5, Issue 8, 17 April 1969
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Volume 5, Issue 8
17 April 1969
Harmonic generation using Gunn diodes
- Author(s): P.S. Kooi and D. Walsh
- Source: Electronics Letters, Volume 5, Issue 8, p. 159 –160
- DOI: 10.1049/el:19690118
- Type: Article
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p.
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–160
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Harmonic generation from Xband using Gunn diodes is reported. Maximum peak output powers were 10mW at the second harmonic, 1mW at the third harmonic and 80μW at the fourth harmonic.
Relaxation oscillations due to impact ionisation in epitaxial sheet-type Gunn oscillators
- Author(s): G.A. Acket and J.J. Scheer
- Source: Electronics Letters, Volume 5, Issue 8, p. 160 –161
- DOI: 10.1049/el:19690119
- Type: Article
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p.
160
–161
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Relaxation oscillations have been observed in field-ionised epitaxial nGaAs samples on a semi-insulating substrate. The decay times of excess electrons and light output are reduced by a transverse magnetic field, indicating the presence of free holes driven towards the surface or the interface by the Suhl effect.
Equivalence of the noise figures of common-source and common-gate f.e.t. circuits
- Author(s): A. van der Ziel
- Source: Electronics Letters, Volume 5, Issue 8, p. 161 –162
- DOI: 10.1049/el:19690120
- Type: Article
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p.
161
–162
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It is shown that the common-source and the common-gate f.e.t. connections have nearly identical noise figures in almost all practical cases. This makes it difficult to explain Mavor's experimental data.
Synthesis of asymptotically stable discrete-time closed-loop linear systems
- Author(s): B. Porter
- Source: Electronics Letters, Volume 5, Issue 8, p. 162 –163
- DOI: 10.1049/el:19690121
- Type: Article
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p.
162
–163
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A simple procedure for synthetising asymptotically stable discrete-time closed-loop linear systems is presented and illustrated by an example.
Parametrically generated high-efficiency low-frequency oscillations in avalanche diodes
- Author(s): M.I. Grace
- Source: Electronics Letters, Volume 5, Issue 8, p. 163 –164
- DOI: 10.1049/el:19690122
- Type: Article
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p.
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–164
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Experimental evidence is presented indicating that the high-efficiency low-frequency oscillation in avalanche diodes is parametrically generated. It is determined that the high efficiency is only observed when the transit time or pump frequency is an integer harmonic of the low-frequency oscillation and extended avalanche is excited.
Resonance of a plane capacitor containing inhomogeneous and anisotropic plasma
- Author(s): A.D. Poularikas
- Source: Electronics Letters, Volume 5, Issue 8, page: 165 –165
- DOI: 10.1049/el:19690123
- Type: Article
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The quasistatic approximate resonance of a plane capacitor partially filled with an inhomogeneous and anisotropic plasma is found using the calculus of variations.
Computer simulation of u.h.f.-transistor small-signal behaviour at high frequencies
- Author(s): D.M. Caughey
- Source: Electronics Letters, Volume 5, Issue 8, p. 165 –167
- DOI: 10.1049/el:19690124
- Type: Article
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–167
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High-frequency 2-port parameters of a u.h.f. transistor are presented, which have been derived from the numerical 1-dimensional solution of small-signal internal behaviour. Results shown include the αlocus and the determination of fT from hfe in the gigahertz region. The validity of the II equivalent circuit is discussed.
Symbolic functions and first-order operators
- Author(s): M. Stafford and J.M. Nightingale
- Source: Electronics Letters, Volume 5, Issue 8, p. 167 –168
- DOI: 10.1049/el:19690125
- Type: Article
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167
–168
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An approximation to the eigenvalue method is applied to first-order systems using artificial periodicity. Two examples are given.
Phase-only acoustic holography
- Author(s): J.R. Coldrick and D. Holt
- Source: Electronics Letters, Volume 5, Issue 8, p. 168 –169
- DOI: 10.1049/el:19690126
- Type: Article
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p.
168
–169
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A simple system for producing acoustic holograms is described, which linearly records only the phase of the object wave rather than both the phase and the amplitude, as in conventional holography. An example of a phase-only acoustic hologram and its optical reconstruction is included.
Transistor fabrication using diffusion barriers produced by electron beams
- Author(s): P.J. Daniel ; R.A. Ford ; J.M. Schofield
- Source: Electronics Letters, Volume 5, Issue 8, p. 169 –170
- DOI: 10.1049/el:19690127
- Type: Article
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169
–170
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Diffusion barriers produced directly by electron-beam-initiated chemical reactions have been used to fabricate planar bipolar transistors without the use of normal oxidation or etching processes. Electrical characteristics of the transistors are comparable with conventional devices.
Voltage and conductivity dependence of the frequency of an acoustoelectric oscillator
- Author(s): S.K. Lahiri and B.R. Nag
- Source: Electronics Letters, Volume 5, Issue 8, p. 170 –171
- DOI: 10.1049/el:19690128
- Type: Article
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–171
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Experimental results on the voltage and conductivity dependence of the frequency of steady-state oscillation of a CdS acoustoelectric oscillator are presented. Comparison is also made with the results obtained from the linear theory of acoustoelectric amplification. It is found that the broad features of the characteristics may be explained by the linear theory.
Optimum longitudinal electro-optic effect in oblique-cut lithium-niobate plates
- Author(s): K.F. Hulme ; P.H. Davies ; V.M. Cound
- Source: Electronics Letters, Volume 5, Issue 8, p. 171 –172
- DOI: 10.1049/el:19690129
- Type: Article
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171
–172
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The longitudinal halfwave voltages for LiNbO3 plates of all orientations have been calculated. Experimental data are presented for the optimum orientation, which has a halfwave voltage of 2500V. The characteristics of LiNbO3 and conventional KD2PO4 longitudinal modulators are compared.
Fourier analysis of pseudorandom binary sequences
- Author(s): R.J. Kavanagh
- Source: Electronics Letters, Volume 5, Issue 8, p. 173 –174
- DOI: 10.1049/el:19690130
- Type: Article
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p.
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It is shown that, for a given-length msequence, the phase angles of the harmonic components of the sequence can take on only certain specified values. Variation of the generating polynomial causes an interchange of the phase angles among the harmonics in a manner which is related to the sampling properties of the sequence.
Erratum: Numerical calculations of the capacitance of linearly graded Si p-n junctions
- Author(s): W. Nuyts and R.J. Van Overstraeten
- Source: Electronics Letters, Volume 5, Issue 8, page: 174 –174
- DOI: 10.1049/el:19690131
- Type: Article
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Erratum: Criterion for the stability of a fourth-order position control system
- Author(s): J.L. Willems
- Source: Electronics Letters, Volume 5, Issue 8, page: 174 –174
- DOI: 10.1049/el:19690132
- Type: Article
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p.
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