PWM based CMOS supply modulator for LTE envelope tracking transmitter

摘要

A PWM based supply modulator on 180nm CMOS process for a high efficiency envelope tracking transmitter is designed. For high efficiency PWM operation, a ramp generator and a non-overlap clock generator are used. With an LTE 20MHz envelope signal with 7.6dB PAPR, the supply modulator shows efficiency of 72.2% with a resistive load of 2ohm.