Patent ID: 9667203
Date: 2017-05-30
CPC Classifications: H03F,H03G,H04B

Claim:
1. A mobile device comprising: a transceiver configured to generate a radio frequency signal and an enable signal having an enabled state and a disabled state; a power amplifier configured to amplify the radio frequency signal; and a bias circuit configured to receive the enable signal and to generate a bias current that biases the power amplifier, the bias circuit configured to control a magnitude of the bias current based on the enable signal and to provide a transient boost to the magnitude of the bias current when the enable signal is transitioned from the disabled state to the enabled state to compensate for a variation in gain of the power amplifier from thermal effects, the bias circuit including a gain correction circuit having an input that receives the enable signal and an output that generates a correction current, a first bipolar transistor having an emitter electrically connected to the output of the correction circuit, and a second bipolar transistor having a base electrically connected to a base of the first bipolar transistor and an emitter configured to generate the bias current.