Electronically controlled variable gain amplifier
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United States of America Patent
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-
Jun 15, 1993
Issued Date -
N/A
app pub date -
Mar 10, 1992
filing date -
May 9, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronically controlled variable gain amplifier is disclosed which provides an output signal proportional to the value of an input signal multiplied by a gain factor, where the gain factor is in turn logarithmically proportional to the value of a gain control signal in the form of a digital word. The amplifier includes a capacitor, a sampler for periodically sampling the value of the input signal and storing the sampled value as a voltage on the capacitor, and circuits for periodically exponentially charging the capacitor after the input signal has been stored thereon for a duration which is directly proportional to the magnitude of the gain control signal. Also included is a circuit for periodically sampling and holding the voltage stored on the capacitor after each periodic charge, where the sampled and held voltage is the amplifier output signal.
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