Title :
A linear-assisted DC-DC hybrid power converter for envelope tracking RF power amplifiers
Author :
Bondade, Rajdeep ; Yi Zhang ; Dongsheng Ma
Author_Institution :
Integrated Syst. Design Lab., Univ. of Texas at Dallas, Richardson, TX, USA
Abstract :
This paper presents the design of a linear-assisted hybrid DC-DC power converter for envelope tracking RF power amplifiers. To jointly leverage the high efficiency of switch-mode DC-DC converters and the wide bandwidth capabilities of linear regulators, a hybrid power supply topology is employed. It exploits a parallel combination of a switch-mode buck DC-DC converter to provide the average power required by the PA, while a push-pull linear regulator is activated to quickly respond to load transients and for envelope tracking. The proposed power supply was designed with a TSMC 0.35-μm CMOS process. For an input voltage of 3V, the PA supply voltage can be regulated at any voltage level from 0.5V to 2.5V, at a nominal switching frequency of 10MHz. It achieves a maximum efficiency of 91.7% at 500mW.
Keywords :
CMOS integrated circuits; DC-DC power convertors; differential amplifiers; network topology; radiofrequency power amplifiers; switched mode power supplies; switching convertors; transients; voltage control; CMOS process; PA; TSMC; envelope tracking RF power amplifier; hybrid power supply topology; linear-assisted DC-DC hybrid power converter; load transient; power 500 mW; push-pull linear regulator; size 0.35 mum; switch-mode buck DC-DC converter; switching frequency; voltage 3 V; voltage regulation; DC-DC power converters; Hybrid power systems; Power supplies; Radio frequency; Regulators; Switches; Voltage control;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Conference_Location :
Pittsburgh, PA
DOI :
10.1109/ECCE.2014.6954193
