Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 15, Issue 16, 2 August 1979
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Volume 15, Issue 16
2 August 1979
Alternative multiplication configuration in microprocessor-based digital filters
- Author(s): P.J. Allen and A.G.J. Holt
- Source: Electronics Letters, Volume 15, Issue 16, p. 481 –482
- DOI: 10.1049/el:19790347
- Type: Article
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By accessing both the multiplier and multiplicand simultaneously, and causing the product to appear directly on the microprocessor's data bus, a fast-multiply facility has been obtained with a Motorola M6800 microprocessor. The system has been adopted in the implementation of a digital filter.
OH-ion reduction in v.a.d. optical fibres
- Author(s): T. Edahiro ; M. Kawachi ; S. Sudo ; H. Takata
- Source: Electronics Letters, Volume 15, Issue 16, p. 482 –483
- DOI: 10.1049/el:19790348
- Type: Article
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–483
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The dehydration effect of SOCl2 on v.a.d. optical-fibre preforms has been investigated. The OH content of the graded-index fibres obtained was reduced to the level of 0.05 p.p.m. (the lowest value was 0.03 p.p.m.), resulting in the minimum loss of 0.60 dB/km at 1.3 μm.
Noninteger sampling to subcarrier frequency ratios in d.p.c.m. of PAL signals
- Author(s): H. Gharavi and R. Steele
- Source: Electronics Letters, Volume 15, Issue 16, p. 483 –484
- DOI: 10.1049/el:19790349
- Type: Article
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A simple predictor having three coefficients is described for d.p.c.m. encoding of composite PAL colour signals. Noninteger ratios of sampling frequency fs to subcarrier frequency fsc can be selected. For a colour-bar signal, it is shown that the s.n.r. of the d.p.c.m. system using fs/fsc = 2.5 is approximately the same as when third-previous sample prediction is used, i.e. when fs/fsc = 3.0.
100 km optical-fibre transmission system at 1.32 μm using high-power c.w. Nd-y.a.g. laser
- Author(s): S. Shimada ; T. Matsumoto ; T. Ito ; S. Matsushita ; K. Washio ; K. Minemura
- Source: Electronics Letters, Volume 15, Issue 16, p. 484 –486
- DOI: 10.1049/el:19790350
- Type: Article
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An allowable transmission-line loss as high as 65.6 dB has been experimentally obtained by using a newly developed high-power 1.32 μm Nd-y.a.g. laser with an average fibre input power of +22.0 dBm at 32 Mbit/s in return-to-zero pulses, which ensures 100 km repeater-spacing transmission with presently available low-loss optical fibres
Some comments on notch capability of N-path filters
- Author(s): B.G. Pain
- Source: Electronics Letters, Volume 15, Issue 16, p. 486 –487
- DOI: 10.1049/el:19790351
- Type: Article
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The notch capability of the N-path filter is investigated experimentally for the simple bipolar-switching case. Verification of the predicted notch for multilevel switching is also presented.
Simple derivation of the expression for the synchronous field in circular cylindrical cavity gyrotrons
- Author(s): M.K. Haldar and A.H. Beck
- Source: Electronics Letters, Volume 15, Issue 16, p. 487 –489
- DOI: 10.1049/el:19790352
- Type: Article
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It is shown that the expression for the synchronous field at any point in a circular cylindrical cavity can be easily obtained using Graf's formula. The result is applied to the calculation of cavity-beam coupling impedances. Results for the ratio of coupling impedances in tubes using magnetron injection guns and tubes in which the guiding centre of the electron beam is on the cavity axis are given. For operation at half the cyclotron magnetic field, the coupling impedance is much higher for tubes of the second type.
Digital frequency discriminator
- Author(s): F.G.A. Coupe
- Source: Electronics Letters, Volume 15, Issue 16, p. 489 –490
- DOI: 10.1049/el:19790353
- Type: Article
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The derivation and design of a simple digital frequency discriminator algorithm suitable for f.s.k. demodulation is described. The principles are then extended to the design of an f.m. demodulator with a quasilinear transfer function. The algorithm may be realised in software or hardware.
Optimum p.c.m. regenerator performance in presence of crosstalk
- Author(s): A.J. Gibbs ; L.J. Millott ; G. Nicholson
- Source: Electronics Letters, Volume 15, Issue 16, p. 490 –492
- DOI: 10.1049/el:19790354
- Type: Article
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Minimum values of p.c.m. regenerator NEXT noise figure and FEXT noise figure are derived. The performance of regenerators with optimised cosine rolloff is within 0.2 dB of these minima, and that of commercial regenerators can be within 2 dB of the minima.
Sidetone expansion for the regulation of talker loudness
- Author(s): D.J. Goodman and J.D. Johnston
- Source: Electronics Letters, Volume 15, Issue 16, p. 492 –493
- DOI: 10.1049/el:19790355
- Type: Article
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A new technique regulates telephone speech level by placing the talker in a feedback loop. This loop provides higher sidetone gain to loud talkers and lower gain to soft talkers.
Comment on practical aspects of filters using amplifier poles
- Author(s): R. Schaumann ; J.R. Brand ; K.R. Laker
- Source: Electronics Letters, Volume 15, Issue 16, p. 493 –494
- DOI: 10.1049/el:19790356
- Type: Article
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It is pointed out that active filters, designed by using operational-amplifier poles, have at high frequencies a number of practical advantages over active RC designs; in particular, they show significantly lower sensitivities.
Switched-capacitor simulation of floating inductors using gyrators
- Author(s): U.W. Brugger ; B.J. Hosticka ; G.S. Moschytz
- Source: Electronics Letters, Volume 15, Issue 16, p. 494 –496
- DOI: 10.1049/el:19790357
- Type: Article
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A simulation of a floating inductor using two switched-capacitor gyrators in cascade is presented.
Universal operational-amplifier convertor technique using supply-current sensing
- Author(s): B.L. Hart and R.W.J. Barker
- Source: Electronics Letters, Volume 15, Issue 16, p. 496 –497
- DOI: 10.1049/el:19790358
- Type: Article
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A generalised differential convertor scheme using current mirrors, as o.a. supply-current sensors, and gain-programming resistors, is described. Results for one specific arrangement, a voltage-controlled current source, are presented and discussed.
Integrating-input technique for c.c.d.
- Author(s): C.J. Oliver ; A.H. James ; D.V. Mccaughan ; J.R. Hill ; J.C. White
- Source: Electronics Letters, Volume 15, Issue 16, p. 497 –499
- DOI: 10.1049/el:19790359
- Type: Article
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A simple rearrangement of the usual waveforms and voltage levels on the input terminals of a charge-coupled device can be used to integrate the input signal during the intersample interval. The method automatically provides a lowpass filter characteristic matched to the sampling time and tends to suppress high-frequency components and hence reduces aliasing problems. Adequate linearity and dynamic range are demonstrated.
Properties of Se-Ge inorganic photoresist as an ion-implantation mask
- Author(s): A. Yoshikawa ; T. Tamama ; Y. Mizushima ; K. Kudo ; T. Shigematsu
- Source: Electronics Letters, Volume 15, Issue 16, p. 499 –501
- DOI: 10.1049/el:19790360
- Type: Article
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The usefulness of Se-Ge inorganic photoresists as ion-implantation masks is described. Experimentally determined values of the projected range and range straggling are in agreement with theory. The required masking thickness is shown to be about ⅓ of that of organic photoresist. Other advantageous features are also pointed out.
Comment: Stable reduced-order Padé approximants using the Routh-Hurwitz array
- Author(s): S.A. Marshall
- Source: Electronics Letters, Volume 15, Issue 16, p. 501 –502
- DOI: 10.1049/el:19790361
- Type: Article
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Reply: Stable reduced-order Padé approximants using the Routh-Hurwitz array
- Author(s): Jayanta Pal
- Source: Electronics Letters, Volume 15, Issue 16, page: 502 –502
- DOI: 10.1049/el:19790362
- Type: Article
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InP/Al2O3n-channel inversion-mode m.i.s.f.e.t.s using sulphur-diffused source and drain
- Author(s): Tsuyoshi Kawakami and Masamichi Okamura
- Source: Electronics Letters, Volume 15, Issue 16, p. 502 –503
- DOI: 10.1049/el:19790363
- Type: Article
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InP metal-insulator-semiconductor field-effect transistors (m.i.s.f.e.t.s) have been fabricated using c.v.d. Al2O3 as the gate insulator and the sulphur-diffusion process for source and drain. The n-channel inversion-mode device exhibits normally off behaviour. A maximum d.c. transconductance gm of 10 mS (87 mS/mm of gate width) has been obtained.
Dynamic permittivity of microstrip ring resonator
- Author(s): Jan Vrba
- Source: Electronics Letters, Volume 15, Issue 16, p. 504 –505
- DOI: 10.1049/el:19790364
- Type: Article
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A simplified method for calculation of the dynamic dielectric constant for a microstrip ring resonator is presented. Attention is also given to the sectors of the annular structure. The new results are compared with earlier work.
Adaptive cancellation of fixed-pattern noise in c.c.d. serial-parallel-serial memory
- Author(s): R.C. Geddes ; C.F.N. Cowan ; J. Mavor ; J.F. Dickson
- Source: Electronics Letters, Volume 15, Issue 16, p. 505 –507
- DOI: 10.1049/el:19790365
- Type: Article
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The letter addresses the problem of the effective implementation of long analogue delay lines. Charge-coupled devices (c.c.d.) appear attractive for this application but suffer from the problem of signal smearing due to imperfect charge transfer. Although s.p.s. delay-line configurations minimise charge-transfer inefficiency, they emphasise the significance of dark current which can cause severe fixed-pattern noise problems in this architecture. A scheme is proposed here for the cancellation of fixed-pattern noise in s.p.s. delay lines and results are presented to demonstrate the effectiveness of the system.
Erratum: Temperature dependence of impact ionisation rates in GaAs between 20° and 200°C
- Author(s): F. Capasso ; R.E. Nahory ; M.A. Pollack
- Source: Electronics Letters, Volume 15, Issue 16, page: 507 –507
- DOI: 10.1049/el:19790366
- Type: Article
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Erratum: Material dispersion in lightguide glasses
- Author(s): J.W. Fleming
- Source: Electronics Letters, Volume 15, Issue 16, page: 507 –507
- DOI: 10.1049/el:19790367
- Type: Article
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