Patent ID: 7227342

Claim:
A polar transmitter circuit comprising: An RF power generation stage having a first and a second input ports and an output port, the first input port 215 is configured to receive an angle modulated signal and the second input port configured to receive an envelope control signal; a DC-DC converter having an input and operable to produce the envelope control signal, the converter comprising: a first non-Silicon-based switching transistor having a drain configured to connect to a DC input voltage, a source and a gate; a Silicon-based controller having an output coupled to the gate of the first non-Silicon-based switching transistor; and an inductor having a first end coupled to the source of the first non-Silicon-based switching transistor and a second end embodying an output of the converter; a polar modulator, which operable to convert input modulation symbols into corresponding phase modulation (PM) component on a PM line and an amplitude modulation (AM) component on an AM line; and the AM line coupled to the input of the DC-DC power converter.