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Electronics Letters

Issue 13 • Date June 22 1978

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Displaying Results 1 - 18 of 18
  • GaAs rib-waveguide directional-coupler switch with Schottky barriers

    Publication Year: 1978, Page(s):387 - 388
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (296 KB)

    A new type of GaAs electro-optic directional-coupler switch for monolithic integrated optics has been proposed and demonstrated. The devices were fabricated from a pair of closely spaced low-loss (¿ ¿ 2.2 dB/cm at 1.15 ¿m) single-mode rib waveguides with Au Schottky barriers. A 30 dB extinction ratio in the input channel was measured at a reverse-bias voltage of 24 V and the switches have a pot... View full abstract»

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  • Optimum correlation method for measurement of noisy transients in solid-state physics experiments

    Publication Year: 1978, Page(s):388 - 390
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (410 KB)

    An optimum tuned correlation method is presented for the measurement of the amplitude and time constant of exponentially decaying pulses embedded in noise, with application specifically to transient studies on semiconductor junctions (d.l.t.s. technique and similar). It yields a peaked spectral type output which is only 3 dB inferior in S/N to an ideal least squares estimator. Alternatively, a dis... View full abstract»

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  • State assignment and entropy

    Publication Year: 1978, Page(s):390 - 391
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (277 KB)

    A recent paper has presented a method of state assignment based upon the maximisation of true (or false) minterms in the next-state functions. This method has the advantage of very elegant implementation. This letter seeks to interpret these results in the light of the concept of entropy. It is shown that there is some justification for using the maximisation of true (false) minterms for optimal s... View full abstract»

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  • Loss and sensitivity of the Lange coupler

    Publication Year: 1978, Page(s):391 - 393
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (402 KB)

    Losses associated with the interdigitated conductor structure of the Lange coupler are examined, leading to a modified conductor geometry which exhibits a reduction of up to 10% in loss. Perhaps more importantly, a sensitivity analysis shows this modified geometry to be much less susceptible to manufacturing tolerances. View full abstract»

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  • A simple power control technique

    Publication Year: 1978, Page(s):393 - 394
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (358 KB)

    An open-loop power control technique that establishes a linear relationship between a d.c. control voltage and the average load voltage is described. The output voltage is insensitive to input a.c. line voltage fluctuations as well as variations in supply frequency. The control output is versatile enough to drive a semiconductor on/off switch or an s.c.r. bridge operating either as a rectifier or ... View full abstract»

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  • Power m.o.s.f.e.t. linear h.f. amplifiers

    Publication Year: 1978, Page(s):394 - 396
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (470 KB)

    N-channel silicon m.o.s. transistors for h.f. power applications have been fabricated which are optimised for linear amplification. These devices exhibit 2 W output power and 11 dB power gain at 630 MHz in class-A operation. The intercept point for third-order intermodulation distortion is 48dBm, which is considerably more than the same data obtainable with bipolar transistors. View full abstract»

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  • Design of nonlinear stochastic learning automata

    Publication Year: 1978, Page(s):396 - 397
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (268 KB)

    The hardware design of nonlinear stochastic learning automata using adpative digital logic elements is considered. Such techniques, based on digital stochastic computing, are shown to provide faster convergence rates than automata based on linear learning algorithms. Experimental results are presented and validation obtained for theoretical predictions concerning optimal convergence. View full abstract»

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  • Cyclotron and upper hybrid resonance frequency in reflected pulse by magnetoplasma half space

    Publication Year: 1978, Page(s):397 - 399
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    Reflected waveforms of impulsive plane waves incident on a homogeneous lossless magnetoplasma half space (with d.c. magnetic field perpendicular to the propagation vector) are determined in the closed form by Bessel functions of first kind and fractional order. The cyclotron plasma frequency is related to the first normalised maximum excursion in the reflected waveforms. Cyclotron and upper hybrid... View full abstract»

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  • Relationship between Kalman and notch filters used in dynamic ship positioning systems

    Publication Year: 1978, Page(s):399 - 400
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (283 KB)

    In dynamic ship positioning systems notch filters have been used mainly to remove the unwanted wave motion signals. Recently, Kalman filters have been introduced for this purpose. It is demonstrated that for this application the stationary Kalman filter is approximated by a notch filter together with a low-pass filter in cascade. View full abstract»

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  • Linear detection of charge in c.c.d. with a dual gate

    Publication Year: 1978, Page(s):400 - 402
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (417 KB)

    A biased gate and a floating gate, coupled by surface potential equilibrium, are used to linearly and nondestructively sense charge in a charge-coupled device. Experimental measurements on a device designed for floating-gate sensing show better linearity when operated in the dual-gate mode. View full abstract»

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  • The `mirrored meander¿¿a directional coupler in microstrip

    Publication Year: 1978, Page(s):402 - 403
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    A new form of microstrip coupler, belonging to the general class of interference couplers, is described. Interfering elements are provided by crossover structures and fabrication of the coupler is relatively simple. Preliminary measurements show the directivity to be good, with further improvement available through a tightening of constructional tolerances. View full abstract»

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  • Generation of high-frequency electromagnetic and acoustic oscillations in a semiconductor in low-frequency electric field

    Publication Year: 1978, Page(s):403 - 404
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (349 KB)

    The effect of generation of high-frequency electromagnetic and acoustic oscillations is theoretically predicted and experimentally found in a piezoelectric semiconductor in an alternating electric field with the frequency corresponding to the `synchronism¿ conditions (i.e. when the period of the field is equal to the double transit time of a sound through the specimen). View full abstract»

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  • Study of a modified-estimating automaton in stationary environments

    Publication Year: 1978, Page(s):404 - 406
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    The application of digital stochastic computing techniques to the hardware implementation of a modified-estimating automaton is considered. Experimental results are presented for the automaton operating in stationary stochastic environments. View full abstract»

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  • Beamwidth variation with aperture diameter of the choked waveguide feed antenna

    Publication Year: 1978, Page(s):406 - 407
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    The choked waveguide feed antenna, which exhibits E- and H-plane radiation pattern equality, good pattern symmetry and low cross polarisation, is an excellent feed for symmetrical reflector antennas with f/D ratios in the range of about 0.3 to 0.4. An experimental programme has been carried out to determine the variation of beamwidth with feed aperture diameter, and the results are presented here. View full abstract»

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  • Degradation in short wavelength (AlGa)As light-emitting diodes

    Publication Year: 1978, Page(s):407 - 409
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (438 KB)

    Degradation in short-wavelength (AlGa)As lasers is investigated through lifetests of such devices operated in the incoherent mode. It is shown that degradation increases with emission energy for diodes containing zinc in the p-type (AlGa)As bounding region, whereas diodes containing Ge in this region, although not satisfactory as c.w. lasers because of high resistivity, show no degradation. A way ... View full abstract»

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  • Deep traps in ideal n-InP Schottky diodes

    Publication Year: 1978, Page(s):409 - 411
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (370 KB)

    A number of deep electron trap levels have been detected in bulk and epitaxial InP for the first time. These deep traps are located in the upper half of the bandgap, and have been observed in Schottky barrier diodes by transient capacitance spectroscopy (d.l.t.s.). The deep traps have been shown to be responsible for low frequency excess noise in the Schottky diodes. View full abstract»

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  • Correction to fast algorithm for computing complex-theoretic transforms

    Publication Year: 1978
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (138 KB)

    This letter corrects an incorrect statement in a previously published letter. View full abstract»

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  • Realisation of resistive N-port networks using operational amplifiers

    Publication Year: 1978, Page(s):412 - 413
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (173 KB)

    A new realisation for an arbitrary resistive n-port network using operational amplifiers is presented in this paper. A simple synthesis procedure is proposed. A numerical example is also given. 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