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Transistor AC and DC Amplifiers With High Input Impedance

Middlebrook, R. D. and Mead, C. A. (1959) Transistor AC and DC Amplifiers With High Input Impedance. Semiconductor Products, 2 . pp. 26-35. ISSN 0096-4034. https://resolver.caltech.edu/CaltechAUTHORS:20150901-113532040

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Abstract

A class of transistor amplifiers is described in which high input impedance is achieved with bias stability comparable with that of ordinary low input impedance amplifiers. Input impedances of several megohms shunted by one or two micromicrofarads are easily realized with simple circuits, and input resistances up to 100 megohms may be obtained with more elaborate circuitry. Other important properties are that input shunt capacitance can be almost completely eliminated, the voltage gain is stabilized, and the output impedance is low. Criteria for best noise performance are discussed. Typical practical measurements are given, and various illustrative circuits are shown for both a-c and d-c amplifiers


Item Type:Article
Additional Information:© 1959 Cowan Publishing.
Record Number:CaltechAUTHORS:20150901-113532040
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150901-113532040
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60010
Collection:CaltechAUTHORS
Deposited By: Kristin Buxton
Deposited On:11 Sep 2015 18:45
Last Modified:03 Oct 2019 08:52

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