Variable gain amplifier
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United States of America Patent
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Issued Date -
Nov 27, 2003
app pub date -
May 22, 2002
filing date -
May 22, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A variable gain amplifier is provided by including a gain control transistor with a differential amplifier. The differential amplifier has a first and second transistor each coupled to data inputs, which can receive a differential data signal. The gain control transistor is coupled between the drains of the first and second transistors. Control voltages are used to shunt differential current through the gain control transistor, providing variable gain with the maximum gain occurring when the control signals turn the gain control transistor off. A constant bias current is maintained by a pair of cascode transistors in parallel coupled to the sources of the first and second transistor.
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