Title :
A two-phase switching hybrid supply modulator for polar transmitters with 9% efficiency improvement
Author :
Ying Wu ; Mok, Philip K. T.
Author_Institution :
Hong Kong Univ. of Sci. & Technol., Kowloon, China
Abstract :
A two-phase switching hybrid amplifier for polar transmitters, implemented in 0.35 ¿m CMOS, lowers output ripple voltage by ripple cancellation, and boosts static efficiency by 9% due to halved switching loss and reduced ripple current flowing through the linear section of the amplifier. Dynamic efficiency improves by 8 to 12% with an on-chip feedforward bandpass filter.
Keywords :
CMOS integrated circuits; band-pass filters; power amplifiers; transmitters; CMOS integrated circuits; halved switching loss; linear section; on-chip feedforward bandpass filter; polar transmitters; ripple cancellation; ripple current; size 0.35 mum; two-phase switching hybrid amplifier; two-phase switching hybrid supply modulator; Bandwidth; Impedance; Inductors; Pulse width modulation; Resistors; Switched-mode power supply; Switching frequency; Switching loss; Transmitters; Voltage;
Conference_Titel :
Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2010 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4244-6033-5
DOI :
10.1109/ISSCC.2010.5433989
