Patent ID: 7177370

Claim:
A transmitter comprising: a variable gain amplifier (VGA) for applying a first gain to a first modulated signal to generate a second modulated signal; a power amplifier for applying a second gain to the second modulated signal to generate a burst output signal, wherein the power amplifier comprises a first power transistor; and a collector control circuit for controlling the second gain by supplying a fixed collector voltage to a collector of the first power transistor in response to a first control signal, and by supplying a ramp control signal to the collector of the first power transistor in response to a second control signal; a baseband circuit for converting a data bit stream into a baseband signal; and an upconverter circuit for modulating the baseband signal onto a carrier frequency, wherein the data bit stream comprises of a series of leading bits followed by a series of data bits followed by a series of trailing bits, wherein when the transmitter is operating in Global System for Mobile Telecommunication (GSM) mode, a first digital-to-analog conversion (DAC) circuit in the baseband circuit performs digital-to-analog conversion on the data bit stream to generate the baseband signal, and wherein when the transmitter is operating in Enhanced Data for Global Evolution (EDGE) mode, the first DAC circuit performs digital-to-analog conversion on an adjusted bit stream, the adjusted bit stream being created by replacing the series of leading bits and the series of trailing bits in the data bit stream with replacement bits, the replacement bits all having a common logic state.