Patent ID: 7868691

Claim:
A commutating amplifier apparatus for use in a polar modulator, comprising: a first commutating amplifier stage coupled to a load stage; a second commutating amplifier stage coupled in parallel with the first commutating amplifier stage and the load stage; and a switching apparatus, said switching apparatus configured to provide control of said selective switching of said first and said second commutating amplifier stages wherein each of said first and said second commutating amplifier stages are configured to provide a predefined scaled output and wherein each of said commutating amplifier stages are configured to be selectively switched on or off in response to a switching signal; wherein each of said first and said second commutating amplifier stages has an efficiency substantially independent of peak-to-average ratio of an input signal coupled to each of said first and said second commutating amplifier stages; and wherein said switching apparatus comprises a switching circuit configured to receive a power control signal associated with a desired output level and provide one or more switching signals to control switching of said first and said second commutating amplifier stages.