Variable gain amplifier
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United States of America Patent
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Dec 9, 2003
Grant Date -
Oct 3, 2002
app pub date -
Feb 13, 2002
filing date -
Feb 13, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A variable gain amplifier is described which comprises a first device to which a first control signal (Vc, Vc1) is applied so that the gain (Ai1, Ai) of an output signal (iout, io) of the first device (11, 22, Q45-Q48) with respect to a first input signal (in, i1, ir) is a function of the exponential type of the first control signal (Vc, Vc1). The amplifier comprises a feedback network (25, Q51-Q58) connected between an output terminal and an input terminal of the first device (22, Q45-Q48) so as to assure that the gain (Ai) in decibel of the first device (22, Q45-Q48) is a linear function of the first control signal (Vc1).
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