A high-efficient and wide-bandwidth supply modulator using power switch controlled technique

A high efficient and wide-bandwidth supply modulator with power switch controlled technique (SMPSC) is presented in this paper. The supply modulator offers dynamic output voltage for RF PA power supply application. Improving the efficiency of the RF PA in RF transceiver system. The parallel architecture of supply modulator has better efficiency and wide output bandwidth. And has the capability of outputting large load current. SMPSC technique follows voltage level of input envelope signal to change output power switch of the switching converter and improve the efficiency. The proposed supply modulator has been fabricated with 180nm CMOS process. The chip area is 1.2μm × 1.2μm. SMPSC can work in static output or dynamic output mode. With an input supply voltage of 3.3 V, the output voltage range can be regulated from 0.5V to 3V. The maximum operation input envelope signal frequency is 20MHz. Experimental results demonstrate that the maximum output current is 600mA with 5 Ω equivalent load.