Patent ID: 6272336
Filing Date: 2001-08-07
Classification: H03G,H04W

Abstract:
For use in an RF transmitter having a transmit path capable of receiving an input baseband signal and generating therefrom a modulated RF output signal, a power control circuit for controlling said RF transmitter comprising:a first signal monitor capable of monitoring a level of said modulated RF output signal and generating therefrom a scaled RF output signal value;a second signal monitor capable of monitoring a level of said input baseband signal and generating therefrom a scaled baseband input signal value;a first comparator capable of comparing said scaled RF output signal value and said scaled baseband input signal value and generating a first gain control signal;a second comparator capable of comparing said first gain control signal and an adjustable reference signal to thereby produce a second gain control signal; andan amplifier bias current controller capable of comparing said scaled RF output signal value and a known maximum output power parameter of a first RF power amplifier in said transmit path and, in response to said comparison, enabling at least a second RF power amplifier in parallel to said first RF power amplifier to thereby increase a combined DC bias current and linearity of said first RF power amplifier and said at least a second RF power amplifier.