A Fast CMOS Self-Oscillating Modulator for RF Power Amplifier

This paper presents a fast CMOS self-oscillating modulator for RF power amplifier. This modulator has been designed in 0.18-mum CMOS technology which occupies an area of 1.5times2 mm
²
and consists of an envelope detector, an envelope amplifier, a fast comparator and an output buffer. The modulator can be applied for both EERPA and DSPA. Simulation results show that the modulator achieves efficiency > 81%, the highest output voltage is close to 1.7V, current >100 mA.