Patent ID: 6163198
Filing Date: 2000-12-19
Classification: G06G,H03F,H03G

Abstract:
A log linear variable gain amplifier control apparatus for providing a differential automatic gain control signal for a current steered variable gain amplifier comprising:a first circuit responsive to an input signal V.sub.IN ;a second circuit responsive to the first circuit providing a first component of the differential automatic gain control signal approximately proportional to the product of V.sub.IN and absolute temperature;a third circuit responsive to the first circuit providing a second component of the differential automatic gain control signal approximately proportional to the product of absolute temperature, the input voltage V.sub.IN and e.sup.V.sbsp.IN ;the first and second components of the differential automatic gain control signal each having a weighting coefficient to provide a current steered variable gain amplifier with a gain having an approximately linear variation of gain in decibels in relation to the input signal V.sub.IN.