Newnes, 1997. — 292 p. — ISBN 0750631023, 978-0750631020.Oscillators have traditionally been described in books for specialist needs and as such have suffered from being inaccessible to the practitioner. This book takes a practical approach and provides much-needed insights into the design of oscillators, the servicing of systems heavily dependent upon them and the tailoring of practical oscillators to specific demands. To this end maths and formulae are kept to a minimum and only used where appropriate to an understanding of the theory. Once grasped, the theory of the general oscillator is easily put into practical use in actual oscillators. The final two chapters present a collection of oscillators from which the practising engineer or the hobbyist can obtain useful guidance for many kinds of projects.Preface.Frequency-determining elements of oscillators. Parallel-tuned LC circuit. Losses in a tank circuit. Characteristics of ‘ideal’ LC resonant circuit. Resonance in the parallel-tuned LC circuit. Practical tank circuits with finite losses. Figure of merit, ‘Q’. Physical interpretation of R0. Phase characteristics of parallel-tuned LC circuit. Series-resonant tank circuits. L/C ratio in tank circuits. Transmission lines. The delay line. Distributed parameters from 'lumped' LC circuit. Resonance in transmission lines. Concept of field propagation in waveguides. Some important features of lines and guides. Quartz crystals. A closer look at crystal operating conditions. Magnetostrictive element. The magnetostriction oscillator. The tuning fork. RC networks as oscillating elements LC networks as phase shifters.Active devices used in oscillators. The bipolar junction transistor. Transistor polarity and Darlington pairs. MOSFET transistors. Operating modes of MOSFETs and JFETs. The voltage-follower format of active devices. Bias considerations in active devices. Using the op amp in oscillators. Modes of operation for op amps and logic circuits. Neon bulb as a switching device. Thyratrons. The thyratron inverter. Spark-gap oscillator. Negative-resistance devices. The dynatron oscillator. Transitron oscillator. The unijunction transistor. Triode input as negative resistance. The saturable magnetic core. Oscillation in the saturable-core circuit. The electron beam in a vacuum. The magnetron The reflex klystron. Travelling-wave tubes and the backward-wave oscillator. Oscillator theory in terms in the universal amplifier. Some considerations in the selection of semiconductor devices for oscillators.Theory of oscillators. The tunnel diode. The Class-C feedback oscillator. The question of original signal voltage Initiation of oscillation build-up. Effect of fixed bias on spontaneous oscillation build-up. Effect of positive feedback on gain of an amplifier. Physical interpretation of infinite gain. Feedback and negative resistance from the ‘viewpoint’ of the resonant tank. The practical obsctacle to infinite build-up Springs, weights and oscillating charges. Divergent effects of bias in feedback and negative-resistance oscillators. The multivibrator. The blocking oscillator. The squegging oscillator. Sine wave oscillation in the phase-shift oscillator. The parallel-T oscillator. The Wien bridge oscillator. Loading of oscillators. The electron-coupled oscillator.Some practical aspects of various oscillators. Three types of Hartley oscillators. The Lantpkin oscillator. The tuned-plate/tuned-grid oscillator. The Miller oscillator. The Colpitts oscillator. The ultra-audion oscillator. The Pierce oscillator. The Clapp oscillator. The tri-let oscillator. The Meissner oscillator. The Meacham bridge oscillator. Line oscillators. The magnetostriction. The Franklin oscillator. The Butler oscillator. Bipolar transistor oscillators. The unijunction transistor oscillator. Optimizing the performance of the Miller crystal oscillator. Optimizing the perfonnance of the Colpitts crystal oscillator.Universal oscillator circuits. The universal amplifier: the three-terminal device. 100 kHz transistor Butler oscillator. An example of a dual-gate MOSFET oscillator. Single transistor parallel-T oscillator. Several special-interest feedback circuits. A harmonic oscillator using a fundamental-frequency crystal. A bipolar transistor overtone crystal oscillator. An overtone crystal oscillator circuit using a FET. The use of diodes to select crystals electronically. Electronic tuning with a reverse-biased silicon diode. Wien bridge oscillator. The op amp square-wave oscillator. Oscillator using an 1C timer. A simple function generator. Square-wave oscillator using logic circuits. A few words about the SN7400 NAND gate 1C. Logic circuit square-wave oscillator with crystal stabilization. A clock oscillator formed from cross-coupled ttl NAND gates. Voltage-controlled oscillators. The Schmitt-trigger oscillator.Special oscillator topics. Guidelines for optimizing VFO performance. Some notes on VXOs. The ceramic filter oscillator. The regenerative modulator — is it an oscillator? The phase-locked loop and synthesized oscillators. A second way of synthesizing frequencies from a reference oscillator. Quelling undesired oscillations. Fancy oscillator functions for the 555 1C timer. Wide tuning range via the difference oscillator. Microwave oscillators. The Gunn Diode. Gated oscillators for clean tum-on and turn-off.Index.
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