Patent ID: 7248111

Claim:
A power amplifier including multi-mode digital bias control circuitry, the power amplifier generating four different bias current levels in response to a combination of two control signals, the power amplifier comprising: a. a complementary reference voltage generation circuit having a first input connected to a first reference voltage, and a second input connected to the first control signal; b. a bias current control circuit having an input connected to the second control signal; c. a low power bias circuit having a first input connected to a first output of the complementary reference voltage generation circuit, and a second input connected to a first output of the bias current control circuit; d. a first stage high power bias circuit having a first input connected to a second output of the complementary voltage reference generation circuit, and a second input connected to a second output of the bias current control circuit; and e. a second stage high power bias circuit having a first input connected to the second output of the complementary voltage reference generation circuit, and a second input connected to a third output of the bias current control circuit.