Patent ID: 8140028

Claim:
An RF driver circuit comprising: a first RF driver stage having a first signal input configured to receive a first signal, a first supply input configured to receive a second signal, and a first output, the first RF driver stage including: a first complementary pair of FET transistors comprising a first transistor and a second transistor; a first pair of resistors including a first resistor switchably coupled between a source of the first transistor and the first output and a second resistor switchably coupled between a source of the second transistor and the first output; and a third resistor coupled between the first signal input of the first RF driver stage and the first output; a second RF driver stage coupled in series with the first RF driver stage, the second RF driver stage having a second signal input coupled to the first output, a second supply input configured to receive the second signal, and a second output; and an AM modulator coupled to the first and second supply inputs and configured to receive an input signal and to provide the second signal; wherein the RF driver circuit is constructed and arranged to combine and amplify the first signal and the second signal and to provide at the second output an amplified output signal based thereon.