Patent ID: 8666339

Claim:
A circuit comprising: an enable terminal configured to receive an enable signal; a main supply terminal configured to receive a main supply voltage; and a first radio frequency (RF) power amplifier (PA) stage coupled with the enable terminal and the supply terminal, the first RF PA stage including: a first active device configured to receive the enable signal and to turn on in response to the enable signal to activate the first RF PA stage; a second active device coupled in series with the first active device and configured to receive the main supply voltage and to provide a first supply voltage across the first active device that is less than and independent of the main supply voltage; and a bypass capacitor coupled with a node between the first active device and second active device to divert RF signals at the node; wherein one of the first active device or the second active device is configured to receive an RF input signal and to pass an amplified RF output signal to a second RF PA stage.