By Topic

# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 26
• ### Realisation of midseries and midshunt lowpass LC filters

Publication Year: 1970, Page(s):593 - 595
| | PDF (334 KB)

A method is described for efficient and accurate realisation of LC lowpass filters directly from the poles and zeros of their reflection coefficients by applying the algorithm developed by Lin and Tokad. Some useful observations concerning the application of the algorithm are also presented. View full abstract»

• ### Test of McWhorter's model of low-frequency noise in Si m.o.s.t.s

Publication Year: 1970, Page(s):595 - 597
Cited by:  Papers (1)
| | PDF (373 KB)

A quantitative test of McWhorter's model is described. It is based on measurements of the equivalent noise voltage and trapping efficiency of surface states. The results indicate that McWhorter's mechanism is probably dominant over a large range of gate voltages for some m.o.s.t.s and up to a few volts above threshold for others. In the latter case, some other mechanism is dominant for large volta... View full abstract»

• ### Remarks on star-mesh transformation of electrical networks

Publication Year: 1970, Page(s):597 - 599
Cited by:  Papers (5)
| | PDF (350 KB)

Two new aspects of the well known star-mesh transformation are studied: (a) the necessary and sufficient conditions for the transformation of a given general mesh network into an equivalent star network; (b) an extension to networks containing sources. View full abstract»

• ### Power transfer between Goubau lines with unequal phase velocities

Publication Year: 1970, Page(s):599 - 601
| | PDF (311 KB)

Results from experimental measurements and theoretical calculations are compared for coupling between surface-wave lines with unequal relative phase velocities. The agreement is good for small differences in relative phase velocities but is less satisfactory as the differences become larger. It is seen that coupling between Goubau lines with unequal relative phase velocities is practical where com... View full abstract»

• ### Influence of metal plate on surface magnetostatic modes of magnetic slab

Publication Year: 1970, Page(s):601 - 602
Cited by:  Papers (8)
| | PDF (318 KB)

The dispersion relationships for surface magnetostatic modes propagating in a ferrite slab with a conducting plate at a small distance parallel to the surface of the slab have been derived. It is shown that the group velocity of the surface magneto-static mode in this configuration can be both positive and negative, depending on the wavelength of the mode and the distance of the conducting plate f... View full abstract»

• ### Synthesis approach to the study of a class of nonlinear systems

Publication Year: 1970, Page(s):602 - 603
| | PDF (293 KB)

Solutions to the governing differential equations of certain classes of 2nd-order nonlinear nonautonomous systems are sought in terms of the powers of trigonometric functions with time-varying amplitudes and frequencies. Use of such generating functions in the synthesis of nonlinear systems is justified by the fact that having powers of the trigonometric functions is equivalent to having terms of ... View full abstract»

• ### Domains and guided electromagnetic waves in GaAs stripline

Publication Year: 1970, Page(s):604 - 605
| | PDF (310 KB)

The velocity of guided electromagnetic (e.m.) waves in a stripline of GaAs is strongly reduced by the finite conductivity in the strip. Travelling-domain formation is prevented if 2c becomes smaller than the domain drift velocity, and a static high-field domain may form at the anode. The slow e.m. wave is expected to influence strongly the transmission-amplification gain. View full abstract»

• ### Suppression of Gunn-effect domain formation by ferrimagnetic materials

Publication Year: 1970, Page(s):605 - 606
Cited by:  Papers (1)
| | PDF (314 KB)

By loading semiconductor surfaces with ferrites, Gunn-effect domain formation can be effectively suppressed. Our analytical results show that the oscillation criterion is nd Â¿ 1.6Ã1011 Â¿(Â¿) cmÂ¿2 where Â¿ is the diagonal component of the tensor permeability. View full abstract»

• ### State-transition analysis of certain thyristor systems

Publication Year: 1970, Page(s):606 - 608
| | PDF (370 KB)

The operation of an m-phase thyristor amplifier with a fully inductive load is treated by state-variable methods. The amplifier and its associated system is treated as a non-conventional sampling system whose basic sampling interval is divided into two subintervals, with appropriate state and transition equations in each. An example is given for a simple current-control system. View full abstract»

• ### Circuit realisations of conjunctors and traditors

Publication Year: 1970, Page(s):608 - 610
Cited by:  Papers (1)
| | PDF (301 KB)

Circuit realisations of conjunctors and traditors are presented. In particular, a conjunctor is shown to be realisable by a resistive nonlinear network made up of four nonlinear resistances and seven linear controlled sources. Similarly, a traditor is shown to be realisable by a dynamic nonlinear network made up of two linear capacitances, eight nonlinear resistances and 16 linear controlled sourc... View full abstract»

• ### Method for the generation of sensitivity functions for nonlinear sampled-data systems

Publication Year: 1970, Page(s):610 - 612
Cited by:  Papers (1)
| | PDF (359 KB)

A method is presented for the generation of parameter sensitivity functions for multi-input multi-output nonlinear sampled-data systems on a hybrid or on a digital computer. An example is presented illustrating the approach. View full abstract»

• ### Fast generation of spherical Bessel functions with complex arguments

Publication Year: 1970, Page(s):612 - 613
Cited by:  Papers (1)
| | PDF (289 KB)

A simple recurrence technique for fast generation of spherical Bessel functions of order n and real or complex arguments is presented. The technique is accurate and very efficient, especially when the order of the function is less than the magnitude of the argument. View full abstract»

• ### One-step integration method for digital differential analysers

Publication Year: 1970, Page(s):613 - 614
| | PDF (250 KB)

A scheme is proposed whereby the normal multistep iteration procedure used in digital integrators can be truncated to a single step, with a subsequent increase in iteration rate. It appears to be of most use for improving the implementation of Adam's method. View full abstract»

• ### Novel temperature-stable ceramics for microwave dielectric resonators and microstrip substrates

Publication Year: 1970, Page(s):614 - 615
Cited by:  Papers (5)
| | PDF (420 KB)

Ceramics comprising homogeneous single-phase zirconate solid solutions of suitable composition have very low temperature coefficients of permittivity, low-frequency permittivities of 30Â¿40 and low losses. Dielectric resonators give Q values up to 4000 and permittivities of 28Â¿35 at 4Â¿5 GHz. The effective permittivity measured on a microstrip ring resonator on a calcium-zirconate substrate shows... View full abstract»

• ### Semiempirical formula for the end-coupled bandpass symmetric stripline filter

Publication Year: 1970, Page(s):616 - 618
| | PDF (399 KB)

It is shown that the equation for the series susceptance of the gap in the centre conductor of a symmetric stripline can be modified to extend its range of validity. This is achieved by empirical determination of a correction factor, in the equation, which is practically constant for given ratios of strip width and thickness to ground-plane spacing. It is also shown that the shunt susceptances of ... View full abstract»

• ### Estimation of quantisation and sampling errors in computer-control systems

Publication Year: 1970, Page(s):618 - 620
Cited by:  Papers (1)
| | PDF (391 KB)

A Gaussian integration routine has been used to estimate the errors due to quantisation and sampling in a digital-control loop. The individual error spectra are made available for inspection, and the treatment can be extended to systems of large order. An example is given of the application of the method. View full abstract»

• ### New approach to triangle-sine-wave generation

Publication Year: 1970, Page(s):620 - 621
| | PDF (292 KB)

An alternative method for the production of sinusoidal waveforms from triangular waveforms is described offering several clear advantages over previously published methods. Peak and crossover distortion is reduced, and the potential for extended frequency operation is provided by this circuit. View full abstract»

• ### Analysis of simplified model relevant to propagation of microwave phonons in y.i.g. rods

Publication Year: 1970, Page(s):621 - 623
| | PDF (355 KB)

In many publications on the resonant absorption of microwave phonons in y.i.g. rods, a comparison is made between theory and experiment without accounting for the difference between the angle defined by the rod axis and the magnetic-bias direction and the angle defined by the rod axis and the internal magnetic-field direction. The letter shows that a simplified model, which accounts for such a dif... View full abstract»

• ### Effect of emitter oxide-window-edge shape in computer-simulation studies of ion-implanted transistors

Publication Year: 1970, Page(s):623 - 625
| | PDF (332 KB)

A method is proposed for modelling 2-dimensional doping profiles in hybrid ion-implanted high-frequency transistors, and the possibility of emitter-collector pipeÂ¿ formation at emitter window edges in narrow-basewidth structures is discussed. An extension of the model to pushed-outÂ¿ double-diffused structures is proposed. View full abstract»

Publication Year: 1970, Page(s):625 - 627
Cited by:  Papers (3)
| | PDF (400 KB)

A parametric 'upconvertor' delivering an output in excess of 1 W at 4 GHz is described. The device is realised in evanescent-mode waveguide, which, in this application, offers good efficiency, freedom from spurious responses and a reduction in size. View full abstract»

• ### Random-signal sonar

Publication Year: 1970, Page(s):627 - 628
| | PDF (309 KB)

The possibility of applying some random-signal radar proposals made by Poirier to a random-signal sonar is discussed A proposal for obtaining bearing information is presented, together with some experimental results. It appears that the limitations inherent in this type of random-signal system severely restrict the useful operation of a practical sonar. View full abstract»

• ### Inversion of rational polynomial matrices

Publication Year: 1970, Page(s):629 - 630
Cited by:  Papers (5)
| | PDF (278 KB)

The letter is concerned with automatic computational procedures for the inversion of a matrix where every element is a rational function. Two possible methods are considered: one based on the Gaussian elimination algorithm and the other based on the Faddeev algorithm. View full abstract»

• ### Modal control of multivariable time-invariant linear systems by output feedback

Publication Year: 1970, Page(s):630 - 632
| | PDF (342 KB)

It is shown that, for a certain class of time-invariant linear systems, modal control can be effected by using output rather than state feedback. View full abstract»

• ### Formulas for linear optimal control over a finite or infinite interval

Publication Year: 1970, Page(s):632 - 633
Cited by:  Papers (1)
| | PDF (233 KB)

Algebraic expressions are given for the solution of the optimal-linear-regulator problem for a constant plant and quadratic performance index. They enable the time-varying or constant feedback gains and the resulting plant trajectories to be found. View full abstract»

• ### Deadzone simulation on an electronic analogue computer

Publication Year: 1970, Page(s):633 - 634
| | PDF (340 KB)

The letter describes a method of obtaining deadzone simulation when the time derivative of the `inputÂ¿ is available. When in the deadzone region with zero input, this method takes longer to drift out of the deadzone region. 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