Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 17, 22 August 1974
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Volume 10, Issue 17
22 August 1974
Digital transmission by frequency-shift keying with zero intersymbol interference
- Author(s): K.W. Cattermole
- Source: Electronics Letters, Volume 10, Issue 17, p. 349 –350
- DOI: 10.1049/el:19740277
- Type: Article
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p.
349
–350
(2)
A general criterion is derived that must be satisfied by the frequency characteristic of a transmission channel if a recovered f.s.k. signal is to exhibit zero i.s.i. It is shown that the bandwidth over which nonzero transmission is required is at least three times the Nyquist bandwidth for the given signalling rate, except for the special case of a frequency shift equal to the signalling rate. A minimal-bandwidth solution is given for a symmetrical bandpass channel of small fractional bandwidth.
Photochromic effect in impurity-doped PLZT ceramics
- Author(s): K. Tanaka and Y. Hamakawa
- Source: Electronics Letters, Volume 10, Issue 17, p. 350 –351
- DOI: 10.1049/el:19740278
- Type: Article
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p.
350
–351
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A photochromic effect observed in a PLZT ceramic system doped with Nb and Fe impurities has been studied. Data on the changes in transmission spectra and the photochromism with doping levels and compositions are reported.
Strain and temperature sensitivity of very-thin low-density tantalum films
- Author(s): Z.H. Meiksin and H.B.Kuo Liang
- Source: Electronics Letters, Volume 10, Issue 17, p. 352 –353
- DOI: 10.1049/el:19740279
- Type: Article
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p.
352
–353
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Low-density tantalum thin films, several-hundred angstroms thick, sputtered at 1500 V can exhibit relatively stable strain-gauge factors of the order ten, after heat treatment at 150 to 200°C. Temperature compensation can be obtained by means of a bridge network energised with a current source.
Extension of Boolean differentiation to define a test for a specific logic fault in a combinational logic network
- Author(s): A.C Prior
- Source: Electronics Letters, Volume 10, Issue 17, p. 353 –354
- DOI: 10.1049/el:19740280
- Type: Article
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p.
353
–354
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The letter demonstrates an extension of Boolean difference to obtain a test for a specific fault. The extension is compared with Roth's D calculus, and it is shown that the two concepts are complementary. A procedure for determining the total fault-detection capability of each test is indicated.
New theory of internal Q switching in semiconductor lasers
- Author(s): S. Gründorfer ; M.J. Adams ; B. Thomas
- Source: Electronics Letters, Volume 10, Issue 17, p. 354 –356
- DOI: 10.1049/el:19740281
- Type: Article
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p.
354
–356
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By considering optical-confinement effects in semiconductor lasers, a new theory is presented of transient phenomena in these devices. It is shown that a partial loss of confinement at high injection levels, when combined with the effects of saturable absorption, can satisfactorily account for Q switching.
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- Author(s): H. Schwab
- Source: Electronics Letters, Volume 10, Issue 17, p. 356 –358
- DOI: 10.1049/el:19740282
- Type: Article
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p.
356
–358
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Mit Hilfe einfacher eindimensionaler physikalischer Modelle für den ohmschen und den abgeschnürten Bereich werden die Ausgangskennlinien von M.O.S.-Feldeffekt-Transistoren unter Berücksichtigung kurzer Kanäle und der Einflüsse von schnellen Oberflächenzustanden abgeleitet und mit Meßergebnissen an n-Kanal- und p-Kanal-M.O.S.-Feldeffekt-Transistoren verglichen.Theoretical current/voltage characteristics of m.o.s. field-effect transistors are derived from simple 1-dimensional physical models for the linear and saturation region, including short channels and the effects of fast surface states, and are compared with measurements of both n-channel and p-channel m.o.s. field-effect transistors. - Author(s): W.V.T. Rusch
- Source: Electronics Letters, Volume 10, Issue 17, p. 358 –360
- DOI: 10.1049/el:19740283
- Type: Article
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p.
358
–360
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The diffraction coefficients for a paraboloid are calculated. - Author(s): K.H. Leung and R. Spence
- Source: Electronics Letters, Volume 10, Issue 17, p. 360 –362
- DOI: 10.1049/el:19740284
- Type: Article
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p.
360
–362
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The letter reports the results of a preliminary feasibility study of an efficient method of statistical analysis for linear nonreciprocal circuits. - Author(s): D. Zissos
- Source: Electronics Letters, Volume 10, Issue 17, p. 362 –363
- DOI: 10.1049/el:19740285
- Type: Article
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p.
362
–363
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The letter proves that no synchronising logic is needed for data transfers between a pair of devices that are triggered into action. This considerably simplifies the interface problem, and leads automatically to the design of device-independent digital systems. - Author(s): A.R. Daniels and D. Slattery
- Source: Electronics Letters, Volume 10, Issue 17, page: 364 –364
- DOI: 10.1049/el:19740286
- Type: Article
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p.
364
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A new multilevel form of switching amplifier is introduced, whose operation is based on the class-AD variable-frequency variable-mark/space-ratio amplifier. It offers practical advantages in reducing important circuit losses when applied to RL loads - Author(s): J.D. Daley
- Source: Electronics Letters, Volume 10, Issue 17, p. 365 –366
- DOI: 10.1049/el:19740287
- Type: Article
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p.
365
–366
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Loop-bandwidth adaptation with varying noise level can be obtained by including a device with a modified limiter transfer function in the loop of a phase-lock loop. A simple realisation of the transfer function and the change in p.l.l. performance are described. Flexibility advantages in use are obtained by this approach. - Author(s): N. Viswanadham
- Source: Electronics Letters, Volume 10, Issue 17, p. 366 –368
- DOI: 10.1049/el:19740288
- Type: Article
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p.
366
–368
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A conceptually straightforward algorithm that yields a bounded dynamic control law that uniformly decouples a class of linear time-varying multivariable systems is presented. For the special case when the system can be uniformly decoupled by state-variable feedback alone, this algorithm demands more stringent conditions from the system than those existing in the literature. - Author(s): D.A. Bell
- Source: Electronics Letters, Volume 10, Issue 17, page: 368 –368
- DOI: 10.1049/el:19740289
- Type: Article
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368
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- Author(s): P.W. Baker
- Source: Electronics Letters, Volume 10, Issue 17, page: 368 –368
- DOI: 10.1049/el:19740290
- Type: Article
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p.
368
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- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 10, Issue 17, page: 368 –368
- DOI: 10.1049/el:19740291
- Type: Article
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p.
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Statische Kennlinien von M.O.S.-Feldeffekt-Transistoren im ohmschen und Sättigungsbereich (Current/voltage characteristics of m.o.s. field-effect transistors in the linear and saturation region)
Physical-optics diffraction coefficients for a paraboloid
Efficient statistical circuit analysis
Logicfree data channels
Class-ABD amplifier
Improved phase-lock-loop performance at medium to low s.n.r.
Decoupling of time-varying systems using dynamic compensators
Comment on ‘Low-frequency noise in incandescent tungsten filaments’
Erratum: D.D.A. register transfers for 3rd-order Kutta integration
Erratum: Treatment of constraint equations in nodal analysis
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