Title :
A 5 GHz class-AB power amplifier in 90 nm CMOS with digitally-assisted AM-PM correction
Author :
Palaskas, Yorgos ; Taylor, Stewart S. ; Pellerano, Stefano ; Rippke, Ian ; Bishop, Ralph ; Ravi, Ashoke ; Lakdawala, Hasnain ; Soumyanath, K.
Author_Institution :
Commun. Circuits Lab., Intel Corp., Hillsboro, OR
Abstract :
This paper presents a technique for correcting AM-PM distortion in power amplifiers. The technique uses a varactor as part of a tuned circuit to introduce a phase shift that counteracts the AM-PM distortion of the PA. The varactor is controlled by the amplitude of the IQ baseband data in a feedforward fashion. The technique has been demonstrated in a class-AB CMOS power amplifier designed for WEAN applications and implemented in a 90 nm CMOS process. The PA delivers 10.5 dBm of average power while transmitting at 54 Mbps (64 QAM). The proposed technique is shown to improve the efficiency of the PA by a factor of 2
Keywords :
CMOS integrated circuits; feedforward amplifiers; phase shifters; power amplifiers; varactors; 5 GHz; 54 Mbit/s; 90 nm; AM-PM distortion; CMOS; IQ baseband data; WEAN application; class-AB power amplifier; digitally-assisted AM-PM correction; phase shift; tuned circuit; varactor; CMOS digital integrated circuits; CMOS process; Frequency; Linearization techniques; Power amplifiers; Transceivers; Transconductors; Varactors; Voltage-controlled oscillators; Wireless LAN;
Conference_Titel :
Custom Integrated Circuits Conference, 2005. Proceedings of the IEEE 2005
Conference_Location :
San Jose, CA
Print_ISBN :
0-7803-9023-7
DOI :
10.1109/CICC.2005.1568793
