Patent ID: 7558542

Claim:
A transmitter circuit for use in a multi-frequency wireless communication system, said transmitter circuit comprising: an input modulation unit for receiving at least one signal that is representative of information to be modulated; a phase modulation system coupled to the input modulation unit for providing a phase modulation on a first output signal, said phase modulation system including a phase detection system and an adjustable power amplifier; and an amplitude modulation system coupled to the input modulation unit for providing amplitude modulation on the first output signal, said amplitude modulation system including an amplitude detection system for providing a second output signal to said adjustable power amplifier, and a variable gain amplifier coupled to the adjustable power amplifier to ensure substantial time alignment of the amplitude and phase signals over an operating range of power levels, said variable gain amplifier gain is set by a ramp voltage associated with the output power of said adjustable power amplifier to ensure substantial time alignment of the amplitude and phase signals over operating range of power levels.