Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 7, Issue 26, 30 December 1971
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Volume 7, Issue 26
30 December 1971
Power-delay product of digital transferred-electron devices
- Author(s): F. Sterzer
- Source: Electronics Letters, Volume 7, Issue 26, page: 761 –761
- DOI: 10.1049/el:19710519
- Type: Article
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p.
761
(1)
A simple analytic expression is derived for the power-dissipation × switching-delay product of digital transferred-electron devices.
Fast frequency-switching system for frequency-shift-keying pulse-code modulation
- Author(s): M. Kawashime and H.L. Hartnagel
- Source: Electronics Letters, Volume 7, Issue 26, p. 761 –763
- DOI: 10.1049/el:19710520
- Type: Article
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p.
761
–763
(3)
An f.s.k. pulse modulator has been developed which uses two cavity modes for the two frequency states of a Gunn oscillator. 300 megapulse operation with about 10 mW microwave output at 13.25 and 20.7 GHz for baseband pulses of about 3 V into 50 Ω was obtained.
Screened impurity scattering in heavily doped covalent semiconductors
- Author(s): D.M. Rowe
- Source: Electronics Letters, Volume 7, Issue 26, p. 763 –764
- DOI: 10.1049/el:19710521
- Type: Article
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p.
763
–764
(2)
A method is presented for determining the relative strengths of acoustic lattice scattering and screened impurity scattering in heavily doped semiconductors from measurements of their Hall mobility and thermoelectric power. Screening of the impurity centres by the free carriers results in an appreciable reduction in the impurity-scattering contribution, and this effect is estimated for heavily doped n type germanium.
Surface-wave parametric signal processing
- Author(s): W.R. Shreve ; G.S. Kino ; M.V. Luukkala
- Source: Electronics Letters, Volume 7, Issue 26, p. 764 –766
- DOI: 10.1049/el:19710522
- Type: Article
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p.
764
–766
(3)
The parametric interaction of surface-wave signals propagating in opposite directions on a lithium-niobate substrate has been used to obtain the crosscorrelation of digitally coded input signals. The output 4 cm interdigital transducer was separated from the substrate by a 2000 Å SiO2 layer to eliminate scattering into volume waves. Matched-filter responses for both amplitude-modulated and biphase Barker codes of up to 13 bits have been obtained.
New expansion for signal-flowgraph determinant
- Author(s): C. Acar
- Source: Electronics Letters, Volume 7, Issue 26, p. 766 –767
- DOI: 10.1049/el:19710523
- Type: Article
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p.
766
–767
(2)
A new expansion for the signal-flowgraph determinant is presented, which gives the complete graph determinant in terms of the subgraph determinants and the loop gains. This expansion is useful for the evaluation of the determinant when the signal flowgraph is complicated and when there are many nontouching loops.
Can a pulse excitation smaller than kT be detected?
- Author(s): Daniel G. Maeder
- Source: Electronics Letters, Volume 7, Issue 26, p. 767 –769
- DOI: 10.1049/el:19710524
- Type: Article
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p.
767
–769
(3)
A ‘1kT-pulse’ excitation of a high-Q-factor LC ringing circuit is defined, and a filter configuration is described which allows the detection of such a pulse with good s.n.r. (signal/noise ratio) and excellent τr, (resolving time). S.N.R.s considerably larger than unity were found experimentally, in reasonable agreement with theoretical calculations.
Simultaneous realisation of transfer and sensitivity functions
- Author(s): E.C. Strycula and N.K. Bose
- Source: Electronics Letters, Volume 7, Issue 26, p. 769 –770
- DOI: 10.1049/el:19710525
- Type: Article
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p.
769
–770
(2)
The problem of the simultaneous realisation of a transfer function and a transfer-function sensitivity using a single feedback path is discussed. The results are illustrated by a simple example.
Attenuation in corrugated rectangular waveguide
- Author(s): R. Baldwin and P.A. Mcinnes
- Source: Electronics Letters, Volume 7, Issue 26, p. 770 –772
- DOI: 10.1049/el:19710526
- Type: Article
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p.
770
–772
(3)
The attenuation characteristics of two corrugated rectangular waveguides propagating the dominant hybrid mode are shown to be significantly better over a wide bandwidth than those for a plain guide propagating the TE10 mode.
Evaluation of an approximated doping profile for diffused junctions from capacitance measurements
- Author(s): P.U. Calzolari and S. Graffi
- Source: Electronics Letters, Volume 7, Issue 26, p. 772 –774
- DOI: 10.1049/el:19710527
- Type: Article
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p.
772
–774
(3)
The differential-capacitance technique for the evaluation of doping profiles of the low-doped side of strongly asymmetrical p-n junctions may be extended to diffused junctions, provided that the actual profile is approximated by an exponential function. An easy fit between experimental and theoretical curves allows evaluation of the two parameters of the exponential approximation.
Construction of Guillemin's B matrix
- Author(s): C. Eswaran and V.G.K. Murti
- Source: Electronics Letters, Volume 7, Issue 26, p. 774 –775
- DOI: 10.1049/el:19710528
- Type: Article
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p.
774
–775
(2)
A modification of Guillemin's procedure for constructing the g̅ matrix is suggested, which ensures that the submatrix Bss shall be nonsingular. The use of the criterion for writing the arbitrary entries of the first row of the g̅ matrix is simple and straightforward when s is of low order.
Recession depth in metallic conductors at low frequencies
- Author(s): P.I. Somlo
- Source: Electronics Letters, Volume 7, Issue 26, p. 776 –777
- DOI: 10.1049/el:19710529
- Type: Article
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p.
776
–777
(2)
It is shown that, at low frequencies, for nonmagnetic conductors of thickness l, the recession depth is l/3 and is independent of frequency and of the conductivity of the material. This simple relationship for low frequencies allows a graph to be drawn of the recession depth over the whole frequency range, since, at high frequencies, the recession depth is one-half of the skin depth δ.
Numerical inversion of rational Laplace transforms
- Author(s): V. Zakian and R. Coleman
- Source: Electronics Letters, Volume 7, Issue 26, p. 777 –778
- DOI: 10.1049/el:19710530
- Type: Article
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p.
777
–778
(2)
Effective methods for numerical inversion of any rational Laplace transform are described. The methods are based on a stable algorithm for the numerical solution of a homogeneous system of 1st-order differential equations.
Broadband high-power TRAPATT diode amplifier at S band
- Author(s): A. Rosen ; J.F. Reynolds ; J.M. Assour
- Source: Electronics Letters, Volume 7, Issue 26, p. 778 –779
- DOI: 10.1049/el:19710531
- Type: Article
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p.
778
–779
(2)
This letter describes the use of a coupled TEM line circuit with high-power high-efficiency silicon avalanche diodes to achieve broadband pulsed amplification in S band. An output power of 50 W, with 6 dB gain and 10% instantaneous 3 dB bandwidth centred at 2.7 GHz, has been obtained.
Microstrip ring resonator and dispersion measurement on microstrip lines
- Author(s): I. Wolff and N. Knoppik
- Source: Electronics Letters, Volume 7, Issue 26, p. 779 –781
- DOI: 10.1049/el:19710532
- Type: Article
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p.
779
–781
(3)
A theory is described which takes into account the curvature of the microstrip ring resonator. This curvature is shown to have a large influence on dispersion measurements on microstrip lines with small impedences.
Interference of low-frequency waves in a positive column
- Author(s): R.M. Perkin and E.R. Wooding
- Source: Electronics Letters, Volume 7, Issue 26, p. 781 –782
- DOI: 10.1049/el:19710533
- Type: Article
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p.
781
–782
(2)
Standing waves have been observed in an argon positive column. From the wave patterns, it is deduced that these waves are striations of the type described by Nedospasov.
Flowgraph determinant
- Author(s): I. Cahit
- Source: Electronics Letters, Volume 7, Issue 26, p. 782 –783
- DOI: 10.1049/el:19710534
- Type: Article
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p.
782
–783
(2)
This letter presents a new theorem concerning the simple evaluation of the determinant of a complex flowgraph. The known graph-determinant formula, and the proposed new one, are compared in a worked example.
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