2.4 GHz CMOS class D synchronous rectifier

Abstract

A CMOS synchronous class D rectifier is implemented in 130 nm technology. The rectifier is designed to operate at 2.4 GHz and requires no external supplies for biasing. The measured RF to DC power efficiency is 30% for an input power of +10 dBm and the power efficiency is greater than 25% over a 12 dB dynamic range from 4-16 dBm. The area of the rectifier is 780 μm by 670 μm including input matching to 50 Ω and a DC output lowpass filter. Important aspects of the design include the feedback network for synchronous switching and injecting gate bias from the drain node.