Operational amplifier circuit
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United States of America Patent
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-
Sep 1, 1981
Grant Date -
N/A
app pub date -
Jun 22, 1979
filing date -
Jun 22, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An operational amplifier circuit having a first amplification stage that includes a differential pair of matches, low-noise transistors coupled in a common-emitter configuration, with a special reactive network in the emitter circuit of each transistor. Each reactive network comprises an inductor and a resistor, arranged in a shunt configuration, whereby at low frequencies the first stage has a relatively high gain and generates relatively low noise, and whereby at high frequencies the first stage has a relatively low gain and the amplifier circuit has sufficient phase margin to ensure stability.
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