Patent ID: 8145147

Claim:
A modulator comprising: a power driver operable to receive an amplitude modulation signal and generate a control signal based on the amplitude modulation signal; a switching device operable to prepare at least two power levels based on the control signal including a channel resistance, a switch component and an offset voltage; a supply voltage; a load resistance; coupled to switching device such that a current flows therethrough, the current involved in the generation of a radio frequency signal; wherein the current is approximated by the quantity of the supply voltage less the offset voltage, divided by the sum of the load resistance and the channel resistance; and a power amplifier operable to receive one of the at least two power levels, wherein the radio frequency signal is based on a phase modulation signal, a bias voltage, a switched power signal and the control signal, wherein the bias voltage is used to modify the phase modulation signal in response to the control signal.