Title :
A WCDMA/WLAN digital polar transmitter with AM replica feedback linearization in 65nm CMOS
Author :
Zheng, Shiyuan ; Luong, Howard C.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China
Abstract :
A 65nm CMOS digital polar transmitter for WCDMA and WLAN is presented, which consists of a 9bit digitally-controlled switch-capacitor polar modulator and a 6-bit power amplifier array with a proposed linearity-enhancement technique. Even without AM-AM pre-distortion, the transmitter system measures RMS-EVM of 2.83% and 4.07% for WCDMA and WLAN 54-Mb/s OFDM, respectively; while providing a peak output power of 20.4dBm with PAE 32.3%.
Keywords :
CMOS integrated circuits; OFDM modulation; amplitude modulation; code division multiple access; transmitters; wireless LAN; AM replica feedback linearization; AM-AM pre-distortion; CMOS digital polar transmitter; OFDM; RMS-EVM; WCDMA digital polar transmitter; WLAN digital polar transmitter; bit rate 54 Mbit/s; digitally-controlled switch-capacitor polar modulator; linearity-enhancement technique; power amplifier array; size 65 nm; transmitter system; word length 6 bit; word length 9 bit; CMOS integrated circuits; Finite impulse response filter; Modulation; Multiaccess communication; Power generation; Spread spectrum communication; Transmitters;
Conference_Titel :
ESSCIRC (ESSCIRC), 2012 Proceedings of the
Conference_Location :
Bordeaux
Print_ISBN :
978-1-4673-2212-6
Electronic_ISBN :
1930-8833
DOI :
10.1109/ESSCIRC.2012.6341255
