Logarithmic amplifier
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United States of America
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Oct 20, 1981
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N/A
app pub date -
Aug 15, 1980
filing date -
Jun 14, 1976
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Abstract
A logarithmic amplifier comprising a common-emitter type transistor amplifier circuit with an emitter resistor and a collector load. A bias voltage is applied to the base of the transistor through a diode so that the overall input-output transfer characteristic of the amplifier exhibits a logarithmic characteristic for a relatively wide range of input signals. A cascade connection of several of the basic amplifier circuits enlarges the dynamic range over which a logarithmic transfer characteristic is achieved.
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