# Electronics Letters

## Filter Results

Displaying Results 1 - 17 of 17
• ### Multimodal behaviour of nonlinear systems with narrowband Gaussian inputs

Publication Year: 1971, Page(s):733 - 734
| | PDF (248 KB)

A method for predicting multimodal behaviour in nonlinear systems with narrowband Gaussian inputs is described. The technique is applicable when the nonlinearity is a function of the input and its derivatives. View full abstract»

• ### Calculation of derivatives for parameter estimation

Publication Year: 1971, Page(s):734 - 735
| | PDF (274 KB)

A recent letter presents a simple method for the computation of the approximate Hessian Â¿{Â¿Â¿k(Â¿)/Â¿Â¿}{Â¿Â¿k(Â¿)/Â¿Â¿}T of a cost function of the form Â¿Â¿Â¿k2(Â¿), where Â¿ is an m-dimensional vector of parameters. In this letter, it is pointed out that the method is applicable to more general cost functions of the form Â¿Lk(Â¿), e.g. the quadratic form Â¿Â¿vkT(Â¿) Q-1 vk(Â¿), where vk is an ... View full abstract»

• ### Stabilising influence of boron in silicon-gate technology

Publication Year: 1971, Page(s):735 - 736
| | PDF (295 KB)

By performing a series of experiments on polysilicon-oxide-silicon (S.O.S.) capacitors, it is shown that, in p channel silicon-gate technology, a gettering action occurs during the drive-in cycle. Although the exact mechanism of this action is not known, it is tentatively suggested that, during the drive-in cycle, boron enters the gate oxide and renders the mobile ions inactive. View full abstract»

• ### Edge-coding operators for pattern recognition

Publication Year: 1971, Page(s):736 - 738
| | PDF (270 KB)

Novel sets of operators for assigning direction codes to black-white boundaries in 2-dimensional binary pictures are proposed. These have application in pattern recognition, and are particularly suitable for use in parallel-processing systems. View full abstract»

• ### Colloid-thruster measurements

Publication Year: 1971, Page(s):738 - 739
| | PDF (233 KB)

Measurements on a capillary-fed colloid thruster with a Zener-diode-like voltage/current (V/I) characteristic are reported. The propellant mass-flow rate m was practically constant over the entire operating range of the current I. A consideration of the V/I and m/I characteristics enables thruster performance to be gauged in a straightforward way. View full abstract»

• ### Synthesis of the optimal receiver structure for binary phase-modulated signals

Publication Year: 1971, Page(s):739 - 741
| | PDF (353 KB)

The optimal receiver structure for signals having combined binary and continuous phase modulation is derived. Both components of the modulation are assumed to be Markov processes, and the received signal is assumed to be embedded in additive white noise. View full abstract»

• ### Arbitrarily located resonant slots in waveguide: exact condition for circular polarisation

Publication Year: 1971, Page(s):741 - 742
Cited by:  Papers (1)
| | PDF (240 KB)

The general displaced inclined resonant slot in a waveguide is analysed in terms of its scattering parameters. The analysis is applied both to a plane and a corrugated waveguide. It is subsequently shown that the condition for direct radiation of circularly polarised waves through crossed slots is less general than is normally expressed. View full abstract»

• ### Experimental comparison of silicon p+-n-p+ and Cr-n-p+ transit-time oscillators

Publication Year: 1971, Page(s):743 - 744
Cited by:  Papers (6)
| | PDF (297 KB)

Punchthrough transit-time diodes have been constructed with both Schottky-barrier and diffused-junction emitters. The microwave and d.c. characteristics of these devices are strikingly similar. Either construction technique appears to be suitable for the future development of low-noise microwave sources. View full abstract»

• ### Rayleigh distance in relation to reflection from curved surfaces

Publication Year: 1971, Page(s):744 - 745
| | PDF (286 KB)

It is shown that the Rayleigh distance for a curved surface needs to be redefined to take into account curvature in the phase of the excitation. If this is done, it can become infinite for a finite reflector, thus validating the geometrical-optics design of Cassegrain subreflectors. Exceptional regions where this feature ceases to hold are indicated. View full abstract»

• ### Synthesis of linear discrete-time-varying systems

Publication Year: 1971, Page(s):745 - 747
| | PDF (386 KB)

The synthesis of a linear discrete-time-varying system from its specified impulse-response matrix H(n, k) is considered. The results include a direct extension of those obtained for the continuous-time counterpart problem, and a simple decomposition method of H(n, k) which is readily extendable to the continuous-time case. View full abstract»

• ### Floating-point cellular-logic multiplier with variable dynamic range

Publication Year: 1971, Page(s):747 - 749
| | PDF (367 KB)

Recently developed cellular-logic arithmetic units have been of the integral type producing, in general, results containing more significant bitsÂ¿ than required. The proposed array enables two floating-pointÂ¿ numbers to be multiplied together to give a result having a floating-pointÂ¿ format with variable significance and exponent range. View full abstract»

• ### Computationally complete operations on magnetic bubbles

Publication Year: 1971, Page(s):749 - 751
| | PDF (358 KB)

The operations of transfer, generation and annihilation on magnetic bubbles constitute a computationally complete binary algebra, if one of these operations is used conditionally. View full abstract»

• ### Simple model for charge-coupled devices

Publication Year: 1971, Page(s):751 - 753
Cited by:  Papers (1)
| | PDF (400 KB)

A theory for charge-coupled devices has been developed, based on the transient nature of charge flow in these devices. It has been shown that the limiting factor in charge-transport processes is that of diffusion, which gives a typical time of 10Â¿8 s for 90% of charge transfer. View full abstract»

• ### Integrated-circuit Schottky polarity guard

Publication Year: 1971, Page(s):753 - 754
Cited by:  Papers (1)
| | PDF (302 KB)

An aluminium Schottky-diode bridge, fabricated using a standard linear integrated-circuit process, is described. The Schottky-barrier structure effectively eliminates parasitic p-n-p transistor action, which is troublesome when collector-base diodes are used. A guard-ringÂ¿ geometry enables a reverse breakdown of 70 V to be achieved. Comparable devices made with `metal-overlapÂ¿ geometry have red... View full abstract»

• ### Microwave transmission method for measuring minority-carrier lifetime in silicon slices

Publication Year: 1971, Page(s):754 - 756
| | PDF (411 KB)

A microstrip transmission method is described for measuring minority-carrier lifetime in thin silicon slices. This method is used to correct results published earlier by Makios and Thomas, using the HP 8410 network analyser as a microwave interferometer. Measured results for high-resistivity samples are shown to extend the earlier curves of Ross and Madigan. View full abstract»

• ### Pedestal control in a diac-triac circuit

Publication Year: 1971, Page(s):756 - 757
| | PDF (297 KB)

The diac-triac circuit discussed has a controlled pedestal with a cosine ramp, and may be used as the basis of many circuits, including a simple soft-start circuit which has very small losses. View full abstract»

• ### Einschnüreffekt bei Transistoren mit Streifengeometrie (Pinch-in effect in transistors with emitter-stripe geometry)

Publication Year: 1971, Page(s):757 - 759
Cited by:  Papers (1)
| | PDF (430 KB)

Es wird gezeigt, da¿¿ bei ausreichend hohem Multiplikations-faktor in der Kollektorfeldzone eine punktf¿¿rmige Einschn¿¿rung des Emitterstromes (pinch-in Effekt) auftretenk ann. Dieser Effekt, der von der Zylindergeometrie her bekannt ist, kommt dadurch zustande, da¿¿ die Gleichverteilung des Emitterstromes in L¿¿ngsrichtung des Emitterstreifens instabil weid. This letter shows that the emitter cu... View full abstract»

## Aims & Scope

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.

Full Aims & Scope

## Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White