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Electronics Letters

Issue 4 • Date April 1967

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Displaying Results 1 - 25 of 37
  • Convenient method of studying helicon waves in solids

    Publication Year: 1967
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (132 KB)  

    A convenient method of studying helicon-wave propagation in solid-state plasmas is described. The method is particularly useful with ordinary laboratory magnets and for low-temperature studies. Some typical experimental results are described. View full abstract»

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  • Quantising for minimum error with particular reference to speech

    Publication Year: 1967 , Page(s): 134 - 135
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (247 KB)  

    A mathematical solution is given for the design of a quantiser suitable for quantising, with minimum mean-square error, a signal with an exponential amplitude probability-density function. This is particularly relevant to speech, the probability-density function of which approximates to the exponential case. View full abstract»

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  • On regular transfer functions and the stability of single-loop-feedback systems

    Publication Year: 1967 , Page(s): 135 - 136
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (243 KB)  

    The main contribution of this letter is a theorem from which can be derived a necessary condition for the stability of linear, time-invariant, single-loop-feedback systems in cases where the forward path and feedback transfer functions may have more poles than zeros. View full abstract»

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  • Inductance simulation with a single differential-input operational amplifier

    Publication Year: 1967 , Page(s): 136 - 137
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    On combining the functions of negative-immittance conversion and positive-immittance inversion in a combined invertor/convertor stage of bridge configuration, a realisation of pure inductance has been achieved using a single operational amplifier of the differential-input type. On modifying the parameters, a grounded series LC branch may be obtained and used as a notch filter. View full abstract»

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  • Thin-film lateral bipolar transistor in silicon-on-sapphire structure

    Publication Year: 1967 , Page(s): 137 - 139
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (444 KB)  

    Heteroepitaxial films of silicon-on-sapphire were used to fabricate lateral bipolar n-p-n transistors. The devices have a common-base direct-current amplification factor of 0.9 and a maximum frequency of oscillation of 2.4 GHz. As a result of the vertical p-n-junction arrangement, small junction areas are possible, e.g. 1×10¿6cm2, which yield depletion-layer capacitances of 0.02¿0.05 pF. View full abstract»

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  • Full-wave rectifier using f.e.t. switches

    Publication Year: 1967 , Page(s): 139 - 140
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (297 KB)  

    A circuit is described which allows full-wave rectification of from 1.5mV to 5V in amplitude, and from 0 to 200 kHz in frequency. A bridge arrangement is used, with four field-effect transistors connected in the arms of the bridge and switched by the output of a comparator circuit which is used to detect the `zero crossing¿ point on the input-signal waveform. View full abstract»

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  • Realisation of transmission zeros with two RC parallel ladders

    Publication Year: 1967 , Page(s): 140 - 142
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (430 KB)  

    The polynomial decompositions due to Calahan and Horowitz can be effectively used for the synthesis of passive RC parallel ladders to realise any zeros of transmission including those on the positive real axis. Only two ladders are sufficient. One of the ladders will be connected via a voltage amplifier having a gain of ±1. View full abstract»

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  • Accurate numerical solution of the one-dimensional p-n junction in steady state

    Publication Year: 1967 , Page(s): 142 - 144
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (325 KB)  

    The fundamental one-dimensional transport equations, applied to a single-junction device in steady state, are solved `exactly¿ on a digital computer (IBM 7094/7040). The relevant internal distributions and terminal properties are obtained, without approximations, to the desired generality and accuracy. An efficient numerical alogrithm limits to approximately 1min the computation time for one set of accurate solutions. View full abstract»

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  • Variation of r41 with wavelength for ADP

    Publication Year: 1967
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (129 KB)  

    The phase retardation produced by an ADP 45° y cut composite modulator is shown to be inversely proportional to wavelength between 0.4¿1.1 ¿m. For this orientation the applied-field-dependent first-order nonlinear term in optical polarisability is wavelength-independent. View full abstract»

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  • Probability of maintaining target track for nonmanoeuvring targets approaching a uniformly scanning search radar

    Publication Year: 1967 , Page(s): 145 - 146
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (297 KB)  

    A lower bound for the scan period that maximises the probability of maintaining target track for a uniformly scanning radar is determined. The value is orders of magnitude greater than common scan periods, and therefore this is not a reasonable optimality criterion. The result is valid for all target cross-section fluctuation models. View full abstract»

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  • Electron detachment in oxygen

    Publication Year: 1967 , Page(s): 146 - 148
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (418 KB)  

    A new experimental method for determining electron detachment (¿) coefficients in swarm conditions in gases is described. Data are given for oxygen at pressures of 20 and 40torr (E/p=40¿50 V cm¿1 torr¿1). ¿/p varies from 2×10¿3 to about 1.3×10¿2cm¿1torr¿1. View full abstract»

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  • Grounding of capacitors in integrated circuits

    Publication Year: 1967 , Page(s): 148 - 149
    Cited by:  Papers (134)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (302 KB)  

    Fabrication techniques indicate that it is easier to obtain earthed capacitors than unearthed ones in integrated circuits. To take advantage of these techniques, a method to earth all capacitors, by replacing them with earthed gyrator-capacitor combinations, is described here. View full abstract»

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  • Frequency-pulling process in frequency-selective circuit

    Publication Year: 1967 , Page(s): 149 - 150
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (351 KB)  

    Frequency displacement of a reflex klystron oscillator, purposely placed in a frequency-selective circuit in a frequency-pulling process, is not monotonically proportional to the driving-power level. Final frequency separation between the oscillator and the driver, which precedes abrupt phase locking, exceeds initial separation. View full abstract»

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  • Transmission-mode y.i.g. dispersive filter for wide-band pulse compression

    Publication Year: 1967 , Page(s): 150 - 151
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (327 KB)  

    It has recently been reported that yttrium-iron-garnet microwave variable-delay lines can be operated in a transmission mode of operation rather than in the usual reflection mode of operation by optical-contact bonding quarterwave plates to both ends of the y.i.g. rod.1.2 This is a distinct advantage for many delay-line applications, because the undelayed direct feedthrough can be suppressed to a much higher degree when input and output lines are at opposite ends of the y.i.g. rod, which is mounted in a tightly fitting hole in a brass block. One of the most promising applications of the y.i.g. delay line is in wide-band microwave pulse-compression filters. The successful operation of a y.i.g. delay line, to obtain compressed signals in a transmission with large suppression of direct leakage of undelayed signals, is reported. View full abstract»

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  • Step-recovery action in transistors

    Publication Year: 1967
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (310 KB)  

    A step-recovery action in the switch-off of certain transistors is reported. The abrupt edge generated is similar to that obtained using step-recovery diodes, but it has the advantage of the transistor current gain, which reduces the load on the driving source. View full abstract»

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  • Simplified method of eliminating the effect of nonlinearities on process cross correlations

    Publication Year: 1967 , Page(s): 151 - 152
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (279 KB)  

    First Page of the Article
    View full abstract»

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  • Two-diode parametric amplifiers

    Publication Year: 1967 , Page(s): 152 - 153
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (257 KB)  

    Analysis suggests that very useful performance may be achieved in parametric amplifiers incorporating two varactor diodes. The most interesting configuration is a bandpass amplifier in which the varactors are the shunt capacitive elements, operated with a phase shift between diodes of 90° at the centre signal frequency and with the diodes mounted with opposite polarities. With inphase pumping this gives unilateral operation and a large potential bandwidth. View full abstract»

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  • Further comments on the Lyapunov matrix equation

    Publication Year: 1967 , Page(s): 153 - 154
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (219 KB)  

    A matrix-iterative scheme for solution of the Lyapunov matrix equation S¿D+DS=¿F, with F symmetrical and S in Schwarz canonical form, is described. The largest matrix to be inverted is a bidiagonal n×n. View full abstract»

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  • Transient response of m.o.s. transistors

    Publication Year: 1967 , Page(s): 155 - 156
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (269 KB)  

    The charge equation of enhancement-type m.o.s. transistors is derived. The waveforms and practical expressions of the switching times of the resistor-coupled m.o.s. switching circuit are determined. View full abstract»

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  • Simple rapid-response hygrometer

    Publication Year: 1967 , Page(s): 156 - 157
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    The instrument makes use of two simple crystal-controlled oscillators having nearly identical temperature/frequency characteristics. One of the quartz plates is covered with a very thin hygroscopic film and exposed to the atmosphere. The difference in frequency of the two oscillators is a function of humidity. Typical results are 6.5 Hz per % change in humidity at room temperature. The hygrometer resolves changes in humity down to 4/100%, the time constant of the sensor being better than 1/50s. View full abstract»

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  • Multitrees and constrained networks

    Publication Year: 1967 , Page(s): 157 - 158
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    General counting formulas are given for the numbers of multitrees in a complete graph, and these are used together with a topological analysis procedure to reveal certain properties of the ideal transformer 4-terminal constraint. View full abstract»

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  • New class of time-varying filters

    Publication Year: 1967 , Page(s): 158 - 160
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (445 KB)  

    A new class of time-varying lowpass and highpass filters is described in which the stopband attenuation is obtained by outphasing in a quadrature-modulation arrangement, the undesired associated frequency translation or inversion being cancelled by a suitably chosen second step of quadrature demodulation or both; bandpass and bandstop filters can be obtained as combinations of lowpass and highpass filters. View full abstract»

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  • Electric field in a p--n-abrupt-junction diode as obtained by exact computer solution of the differential equations

    Publication Year: 1967 , Page(s): 160 - 162
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (406 KB)  

    A computer solution for the current, continuity and Poisson's differential equations has been obtained for the forward steady-state behaviour of a 1-dimensional abrupt p+-n-junction germanium diode at zero and at low to high injection levels at 300° K. The numerical integration has been performed in and outside the space-charge layer of the p-n junction by using the Hall-Shockley-Read and the Auger recombination processes and by eliminating the Boltzmann equilibrium approximation in the space-charge layer and the space-charge neutrality approximation in the quasineutral p and n region. The numerical results for the electric-field distributions are reported. View full abstract»

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  • Acoustic-wave amplification in high-mobility semiconductors at microwave frequencies

    Publication Year: 1967 , Page(s): 162 - 163
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (287 KB)  

    The use of high-mobility piezoelectric semiconductors for acoustic-wave amplification at microwave frequencies is considered. View full abstract»

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  • T.W.T.-type radiation from a uniformly moving charge in an isotropic plasma environment

    Publication Year: 1967 , Page(s): 163 - 165
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    The characteristics of the travelling-wave-tube-type radiation produced by a point charge moving with uniform velocity along the axis of an infinite cylindrical cavity of free space in an otherwise unbounded, isotropic, cold and homogeneous plasma are investigated. For sufficiently small radius of the free-space column, the frequency of the emitted radiation is close to the plasma frequency, and the radiated energy is of significant strength and progresses in a direction opposite to that of the motion of the charge. View full abstract»

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Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

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Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK