Patent ID: 7551029

Claim:
A transconductance stage providing gain control, comprising: an input stage to convert a first differential input voltage and a second differential input voltage to a first intermediate current and a second intermediate current, respectively; and an output stage to generate a first output current signal and a second output current signal based on the first and second intermediate currents, respectively, the output stage including a first plurality of output transistors coupled to a first plurality of corresponding switch resistors to provide the first output current signal; and a second plurality of output transistors coupled to a second plurality of corresponding switch resistors to provide the second output current signal, wherein a number of activated switch resistors of the first plurality of switch resistors determines a gain of the first output current signal and a number of activated switch resistors of the second plurality of switch resistors determines a gain of the second output current signal, and wherein the number of activated switch resistors of the first plurality of switch resistors are independently controllable from the number of activated switch resistors of the second plurality of switch resistors.