Gain and impedance switching circuit for an amplifier
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United States of America Patent
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-
Jul 1, 1980
Grant Date -
N/A
app pub date -
Aug 23, 1978
filing date -
Aug 29, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gain and impedance switching circuit for an amplifier includes an AF amplifier having an input impedance connected between the input terminal thereof and a reference point and a feedback circuit connected between the feedback and output terminals of the amplifier, a first series circuit consisting of a first impedance and a first ON/OFF switch and connected between the input terminal of the AF amplifier and a reference point (such as ground) and a second series circuit consisting of a second impedance and a second ON/OFF switch connected between the feedback terminal of the AF amplifier and the reference point, the first and second ON/OFF switches being ganged with each other so as to change the input impedance and the gain of the AF amplifier simultaneously.
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