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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 15, Issue 12, 7 June 1979

Volumes & issues:

Volume 15, Issue 12

7 June 1979

Piezojunction effect of a planar n-p-n transistor for transducer aims
  • Author(s): R.J. Veen
  • Source: Electronics Letters, Volume 15, Issue 12, p. 333 –334
  • DOI:  10.1049/el:19790236
  • Type: Article
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  • p. 333 –334 (2)
    Measurements of the piezojunction effect of planar n-p-n transistors are reported. The principle for a pressure transducer that makes use of the variation of the base-emitter voltage as a function of the pressure is described. The transducer uses a balanced configuration to lower the temperature sensitivity. Together with the transducer transistors, an adjustment circuit and an output amplifier are integrated on the same chip. Measurements of the complete transducer show a sensitivity of 2 mV per gram exercised force.
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Tailoring zero chromatic dispersion into the 1.5–1.6 μm low-loss spectral region of single-mode fibres
  • Author(s): L.G. Cohen ; Chinlon Lin ; W.G. French
  • Source: Electronics Letters, Volume 15, Issue 12, p. 334 –335
  • DOI:  10.1049/el:19790237
  • Type: Article
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  • p. 334 –335 (2)
    We have designed and fabricated single-mode silica fibres that have zero chromatic dispersion within the 1.5–1.6 μm low-loss spectral region by controlling their waveguide dispersion and dopant-dependent material dispersion. These fibres have small core diameters and large core-cladding refractive-index differences, Δn = 0.018, corresponding to a 13 mole % GeO2 dopant concentration in the core. The zero-dispersion wavelength was shifted from λ0 = 1.375 μ to λ0 = 1.54 μ by decreasing the fibre core diameter from 7 μm to 4.8 μm. This ability to tailor the minimum dispersion wavelength to the ultra-low-loss region near 1.55 μm is important for designing single-mode fibres for very long distance and very high capacity optical transmission.
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CdTe/Langmuir-film m.i.s. structures
  • Author(s): M.C. Petty  and  G.G. Roberts
  • Source: Electronics Letters, Volume 15, Issue 12, p. 335 –336
  • DOI:  10.1049/el:19790238
  • Type: Article
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  • p. 335 –336 (2)
    Langmuir films based on cadmium stearate have been successfully deposited on to the surface of p-type CdTe. The measured C/V curves show, for the first time, the accumulation, depletion and weak-inversion regions typical of an ideal device. The G/V curves show a sharp peak in the depletion region at high frequencies which is thought to be due to losses at interface states. An initial estimate of the density yields an average value of 1011 states cm−2.
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Relation between splice loss and mode conversion in a graded-index optical fibre
Roll-off shaping filter design for improving adaptive equalisation
S.A.W. resonators at 1.29 GHz with Q values approaching the material limit
  • Author(s): William J. Tanski
  • Source: Electronics Letters, Volume 15, Issue 12, p. 339 –340
  • DOI:  10.1049/el:19790241
  • Type: Article
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  • p. 339 –340 (2)
    Two-port s.a.w. resonator filters have been fabricated at 1.29 GHz with Q values up to 7050. This experimental unloaded Q is about 87% of the material limit of 8100 at this frequency. Details of the device design are given and salient features of the fabrication process are outlined. The experimental results are discussed, demonstrating sufficient knowledge to permit fabrication of useful devices at supra-GHz frequencies.
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Effects of emitter edge dislocations on the low frequency noise of silicon planar n-p-n transistors
Internal stress and degradation in short-wavelength AlGaAs double heterojunction devices
TEon-mode filters for the v.l.a. circular waveguide system
Sine-cosine squared-magnitude function for maximally flat digital bandpass filters with adjustable skirt selectivities
Self-tuning controller steady-state error
Error-feedback digital filters
Detection of minority-carrier traps using transient spectroscopy
Discrete frequency synthesis using an analogue r.o.m.
  • Author(s): G.F. Manes  and  C. Atzeni
  • Source: Electronics Letters, Volume 15, Issue 12, p. 350 –352
  • DOI:  10.1049/el:19790249
  • Type: Article
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  • p. 350 –352 (3)
    A new analogue frequency synthesiser is introduced and experimentally demonstrated. It is based on a tapped delay line driven by a sinusoidal waveform, which provides analogue sinusoidal samples permanently stored at the output of the individual taps, thus operating as an analogue r.o.m. Frequency synthesis is accomplished by selectively reading-out these sinusoidal samples at a fixed clock rate through an analogue multiplexer. This system represents the analogue counterpart of a digital frequency synthesiser described by other authors, thus allowing similar architectures to be implemented for the generation of a large set of frequencies using analogue operations.
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Streak and spot detection in digital pictures
  • Author(s): B.G. Batchelor
  • Source: Electronics Letters, Volume 15, Issue 12, p. 352 –353
  • DOI:  10.1049/el:19790250
  • Type: Article
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  • p. 352 –353 (2)
    A procedure is discussed for detecting dark streaks and spots (intensity anomalies) in a digital picture. The algorithm is insensitive to intensity cliffs and plateaux edges, and it can be finely ‘tuned’ to accept anomalies of a given size while rejecting others. It has been successfully applied to the detection of scratches on the internal surfaces of hydraulics cylinders and results were presented in an earlier paper. The present article discusses the properties of the algorithm and demonstrates its behaviour on a test picture.
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Engineering approach to the L∞-norm scaling of bilinear digital filters
New rigorous analysis of the step discontinuity in a slab dielectric waveguide
Transitional Murromaf–Murroer filters
  • Author(s): V.S. Stojanović  and  V.D. Pavlović
  • Source: Electronics Letters, Volume 15, Issue 12, p. 356 –357
  • DOI:  10.1049/el:19790253
  • Type: Article
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  • p. 356 –357 (2)
    A new class of lowpass filters with all transmission zeros at infinity, having equal-ripple behaviour in the passband, is described. The transfer function of these filters, referred to as transitional Murromaf-Murroer filters, is obtained by adding the multiple real poles and reducing the number of complex pole pairs to realise a lowpass RC active filter with a reduced number of amplifiers with respect to the classical transitional Butterworth-Cheby̅shev filters.
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Nondestructive refractive-index profile measurement of elliptical optical fibre or preform
Self-adaptive Kalman filter
Optimal input for stochastic linear discrete systems as a function of input and output variables
Erratum: Method for designing recursive digital filters with short wordlength
Erratum: Multipath propagation in line-of-sight links
Erratum: 1.5 μm optical transmission experiments using very low-loss single-mode fibre
Erratum: Digital processing technique for suppressing the interfering outputs in the image from an inline hologram
Erratum: Characteristic function for quasielliptic filters
Erratum: Technique for triple-transit suppression in surface-acoustic-wave delay lines

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