High Frequency Transistor Oscillators

High Frequency Transistor Oscillators

Author: Joseph Warren Kenny

Publisher:

Published: 1961

Total Pages: 110

ISBN-13:

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The operation of high frequency class-C alloy junction transistor oscillators is studied by use of a simplified version of the block-diagram representation for the transistor as developed by Bruun. For the simplified version of the block-diagram representation used, unilateral operation of the transistor is assumed. Expressions approximating the transistor time delay, peak ac input voltage, and the collector current pulse cutoff time are derived by use of the block-diagram equations. An analog circuit, derived from the block-diagram equations, is used to study the class-C operation of a typical alloy junction transistor, and the results of this study are found to compare accurately with the actual transistor operation. (Author).


RF and Microwave Transistor Oscillator Design

RF and Microwave Transistor Oscillator Design

Author: Andrei Grebennikov

Publisher: John Wiley & Sons

Published: 2007-04-30

Total Pages: 458

ISBN-13: 9780470512081

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The increase of consumer electronics and communications applications using Radio Frequency (RF) and microwave circuits has implications for oscillator design. Applications working at higher frequencies and using novel technologies have led to a demand for more robust circuits with higher performance and functionality, but decreased costs, size and power consumption. As a result, there is also a need for more efficient oscillators. This book presents up to date information on all aspects of oscillator design, enabling a selection of the best oscillator topologies with optimized noise reduction and electrical performance. RF and Microwave Transistor Oscillator Design covers: analyses of non-linear circuit design methods including spectral-domain analysis, time-domain analysis and the quasilinear method; information on noise in oscillators including chapters on varactor and oscillator frequency tuning, CMOS voltage-controlled oscillators and wideband voltage-controlled oscillators; information on the stability of oscillations, with discussions on the stability of multi-resonant circuits and the phase plane method; optimized design and circuit techniques, beginning with the empirical and analytic design approaches, moving on to the high-efficiency design technique; general operation and design principles of oscillators, including a section on the historical aspects of oscillator configurations. A valuable reference for practising RF and Microwave designers and engineers, RF and Microwave Transistor Oscillator Design is also useful for lecturers, advanced students and research and design (R&D) personnel.


A Study of Transistor Blocking Oscillators as Nanosecond-pulse Generators

A Study of Transistor Blocking Oscillators as Nanosecond-pulse Generators

Author: John Charles McDonald

Publisher:

Published: 1963

Total Pages: 68

ISBN-13:

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A method for calculating the switching time and pulse duration of transistor blocking oscillators operating in the nanosecond time domain is presented. The original theory proposed by Linvill and Mattson is tested using transistors with increasing alpha cutoff frequency. This theory gives close correlation between measured and calculated switching times for low-frequency transistors. For high-frequency units differences as large as an order of magnitude exist. With circuit switching times of less than 10 nsec, a new circuit model is necessary for good theoretical and measured correlation. Small-signal analysis as proposed by Linvill and Mattson adequately describes the circuit operation, and even considering that large signal are involved in the circuit's operation, a large-signal transistor model is necessary only during a description of initial turn-on. Design techniques for minimizing switching time, based on the new circuit models, are presented. A free running oscillator is described with a 6-nsec rise time and a 3-nsec fall time, and design limitations of the blocking oscillator as a nanosecond-pulse generator are presented. The pulse-width determination theory given by Linvill and Mattson is shown to give accurate results if the feed back capacitor is sufficiently large to maintain a constant voltage across the emitter during the output pulse. (Author).