Temperature compensation control circuit for exponential gain function of an AGC amplifier
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United States of America Patent
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Nov 10, 1992
Grant Date -
N/A
app pub date -
Sep 18, 1990
filing date -
Sep 18, 1990
priority date (Note) -
Expired
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Abstract
A temperature compensation control circuit to maintain a constant control gain in an AGC (automatic gain control) amplifier. The present invention compensates for the inherent temperature dependence without using any special processing or non-standard device structures. The present invention utilizes the voltage drop across n diodes in series to produce the control voltage difference (V.sub.C -V.sub.C *). These n series diodes are coupled to the collectors of a PNP emitter coupled pair with emitter resistance. This causes the control voltage difference to be dependent on temperature (nkT/q), but this dependency cancels out with the other inherent temperature dependency in the exponential function of the AGC amplifier which is also produced by a diode form. Thus, the present invention provides temperature compensation with minimum component matching problems and without the need for a PTAT (proportional to absolute temperature) current source.
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