Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 11, Issue 18, 4 September 1975
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Volume 11, Issue 18
4 September 1975
Angular dependence of the mode-coupling coefficient in a multimode optical fibre
- Author(s): L. Jeunhomme and J.P. Pocholle
- Source: Electronics Letters, Volume 11, Issue 18, p. 425 –426
- DOI: 10.1049/el:19750327
- Type: Article
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p.
425
–426
(2)
We derive a simple relationship which gives the angular dependence of the mode-coupling coefficient when the steady-state radiation pattern of the fibre is known. The correlation length and the amplitude of the random bends are deduced for two naked fibres and one sheathed fibre.
Iterative digital multiplier based on cellular arrays of r.o.m.s
- Author(s): T.J. Chung and S.D. Bedrosian
- Source: Electronics Letters, Volume 11, Issue 18, p. 426 –428
- DOI: 10.1049/el:19750328
- Type: Article
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p.
426
–428
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A new flexible multiplier design using r.o.m.s in a cellular array is presented. This economical multiplier operates at high speed without loss of accuracy, even when the number of bits increases, say, to 48 × 48 bits.
Clock averaging circuit
- Author(s): N.W. McLeod and J. Wise
- Source: Electronics Letters, Volume 11, Issue 18, p. 428 –429
- DOI: 10.1049/el:19750329
- Type: Article
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p.
428
–429
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A very simple, low-cost and effective technique for deriving the average frequency of a number of different clocks is presented.
Particular universal function generator
- Author(s): J.C. Muzio
- Source: Electronics Letters, Volume 11, Issue 18, page: 429 –429
- DOI: 10.1049/el:19750330
- Type: Article
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p.
429
(1)
The letter gives details of a particular logic block whose output may be any of the 16 binary functions. The device has one fixed data input and three other inputs. A simple NAND/XOR circuit for the block is given.
High-power C band Read IMPATT diodes
- Author(s): M.G. Adlerstein ; R.N. Wallace ; S.R. Steele
- Source: Electronics Letters, Volume 11, Issue 18, p. 430 –431
- DOI: 10.1049/el:19750331
- Type: Article
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p.
430
–431
(2)
A GaAs multimesa Read IMPATT-diode structure has been developed for operation in C band. Such devices give reproducible oscillator power output levels in excess of 10 W c.w. at 5 GHz. Junction temperature rises less than1 80 deg C are observed during high-power operation. The diodes are constructed with an integral gold-plated heatsink and bonded with Au : Sn eutectic solder in a small package.
Numerical solutions to the 2-dimensional time-dependent semiconductor equations
- Author(s): C.R. Jesshope
- Source: Electronics Letters, Volume 11, Issue 18, p. 431 –433
- DOI: 10.1049/el:19750332
- Type: Article
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p.
431
–433
(3)
A numerical method for the solution to the time-dependent semiconductor equations is concisely defined. Accurate results of the application to a high-frequency transistor operating at 3 GHz are given.
Fault-tolerant digital clocking system
- Author(s): J. Moreira De Souza and E. Peixoto Paz
- Source: Electronics Letters, Volume 11, Issue 18, p. 433 –434
- DOI: 10.1049/el:19750333
- Type: Article
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433
–434
(2)
A fault-tolerant digital clocking system is proposed.
Microstrip system for voltage-controlled phase equalisation for microwaves
- Author(s): M. Bramanti and L. Tarabella
- Source: Electronics Letters, Volume 11, Issue 18, p. 434 –436
- DOI: 10.1049/el:19750334
- Type: Article
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p.
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–436
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A group-delay reflective-mode microwave equaliser is proposed. The required delay is obtained combining several voltagecontrolled circulator-coupled elementary cells. For an assigned phase response, the circuit is designed by an interactive program. Experimental results are reported relative to L band systems with constant and linear delay.
New coupling method for GaAs-laser–fibre coupling
- Author(s): E. Weidel
- Source: Electronics Letters, Volume 11, Issue 18, p. 436 –437
- DOI: 10.1049/el:19750335
- Type: Article
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p.
436
–437
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A new method for coupling a diode laser to an optical fibre is described. This uses a cylindrical glass fibre as a focusing element. Optical feedback from the fibre endface has been found to have an influence on the laser output power. As a result, the light power launched into a single-mode fibre was higher than that obtainable from the laser during normal operation.
Mass-production-type GaAs IMPATT diodes in s.h.f. band
- Author(s): M. Miyazaki and M. Migitaka
- Source: Electronics Letters, Volume 11, Issue 18, p. 437 –438
- DOI: 10.1049/el:19750336
- Type: Article
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437
–438
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The structure of mass-production-type GaAs IMPATT diodes is described. By making the diodes with a mesa structure embeded in polyimide resin, batch fabrication of small-area diodes has become possible over a large wafer area. Diodes so far obtained have almost the same characteristics as those of conventional GaAs IMPATT diodes.
Design considerations for a receiver for digital fibre-optic communication systems
- Author(s): F. Lombardi and G. Orlandi
- Source: Electronics Letters, Volume 11, Issue 18, p. 439 –440
- DOI: 10.1049/el:19750337
- Type: Article
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p.
439
–440
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An approach to design easily a receiver for digital fibre-optic communication systems is given. In particular, a 34.368 Mbit/s communication system is analysed, where little or no avalanche-detector gain is used.
Optimum digital phase-locked loops
- Author(s): A.J. Ruddell and A.M. Rosie
- Source: Electronics Letters, Volume 11, Issue 18, p. 440 –441
- DOI: 10.1049/el:19750338
- Type: Article
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p.
440
–441
(2)
The optimum discrete filters to track phase and frequency steps in the presence of additive white Gaussian noise are derived, and are found to be equivalent to the baseband models of 1st- and 2nd-order digital phase-locked loops, respectively. Practical design parameters are presented.
Digital simulation of electronic components
- Author(s): D.N. Pim and J.M. Bullingham
- Source: Electronics Letters, Volume 11, Issue 18, p. 441 –442
- DOI: 10.1049/el:19750339
- Type: Article
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p.
441
–442
(2)
A method is described for simulating resitive networks by digital (hardware) techniques. Advantages of the method include increased accuracy of component specifications and freedom from aging effects. Other components may be simulated similarly.
Arrays for generating arbitrary mask vectors
- Author(s): D.D. Gajski
- Source: Electronics Letters, Volume 11, Issue 18, p. 442 –443
- DOI: 10.1049/el:19750340
- Type: Article
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p.
442
–443
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A circuit for generating mask vectors is described. It can be connected into an array when long mask vectors are required. Such arrays are very useful in any kind of field manipulation, as field extraction, field insertion, shifting etc.
Practical minimum-capacitance very-low-frequency RC active network
- Author(s): G. Wilson
- Source: Electronics Letters, Volume 11, Issue 18, p. 443 –444
- DOI: 10.1049/el:19750341
- Type: Article
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p.
443
–444
(2)
A practical solution to the problem of capacitance minimisation in very-low-frequency RC active networks is presented. The proposed multiloop structure functions as a lowpass filter, a medium Q factor bandpass filter or an oscillator and achieves capacitance enhancement via the well known Miller effect.
Approximate identification of automata
- Author(s): B.R. Gaines
- Source: Electronics Letters, Volume 11, Issue 18, p. 444 –445
- DOI: 10.1049/el:19750342
- Type: Article
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p.
444
–445
(2)
A technique is described for the identification of probabilistic and other nondeterministic automata from sequences of their input/output behaviour. For a given number of states the models obtained are optimal in well defined senses, one related to least-mean-square approximation and the other to Shannon entropy. Practical and theoretical investigations of the technique are outlined.
Quasisaturation-region operation of n–p–n−–n power transistors
- Author(s): S.P. Gaur
- Source: Electronics Letters, Volume 11, Issue 18, p. 446 –447
- DOI: 10.1049/el:19750343
- Type: Article
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p.
446
–447
(2)
A 2-dimensional mathematical model is utilised to predict the internal behaviour of a typical n–p–n−–n power transistor operating under steady-state conditions. Results of the analysis for the quasisaturation-region operation indicate the extension of the base region in the n− collector and the presence of appreciable minority charge carriers in the inactive base region under the base contact.
Pulse broadening in near-square-law graded-index fibres
- Author(s): J.A. Arnaud
- Source: Electronics Letters, Volume 11, Issue 18, p. 447 –448
- DOI: 10.1049/el:19750344
- Type: Article
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–448
(2)
A closed-form expression for pulse broadening in graded-index fibres that have small and circularly symmetric, but otherwise arbitrary, deviations from a square-law, and arbitrary dn/dλ, is applied to germania-doped fibres. The range of validity of the theoretical expression is defined by comparison with the results of numerical integration.
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