A baseband signal is processed by amplifying a first pulse width modulation radio frequency signal having a first non-negligible peak-to-peak amplitude and a second non-negligible peak-to-peak amplitude larger than the first non-negligible peak-to-peak amplitude. A second pulse width modulation radio frequency signal is also amplified, the second pulse width modulation radio frequency signal having a third non-negligible peak-to-peak amplitude approximately equal to the second non-negligible peak-to-peak amplitude of the first pulse width modulation signal when the baseband signal power is at or above the second threshold level. The amplified signals are constructively combined to form a pulse width modulation radio frequency signal comprising a plurality of non-negligible peak-to-peak amplitude levels each corresponding to a different baseband signal power range.