Baseband receiver circuitry is dynamically biased in a communication
system receiver by generating gain control information, and controlling
an adjustable bias of at least a portion of the baseband circuitry based
at least in part on the gain control information. The baseband receiver
circuitry comprises at least one amplifier having an adjustable bias
associated therewith, with the adjustable bias of the amplifier being
controllable utilizing a bias control signal. For example, the amplifier
may be an operational amplifier having a gain stage and an output buffer
stage, with the bias control signal being applied to the output buffer
stage to control an adjustable bias current thereof. More specifically,
the bias control signal may be used to control an amount of current
provided by at least one of a plurality of current sources associated
with the output buffer stage of the amplifier, for example, by
controlling a switch which enables or disables one or more of the current
sources. Advantageously, the dynamic bias control can substantially
reduce power consumption in the receiver. The techniques of the invention
can also be applied to other types of devices which utilize gain control.