Title :
An efficiency-enhanced 2.4GHz stacked CMOS power amplifier with mode switching scheme for WLAN applications
Author :
Yun Yin ; Baoyong Chi ; Xiaobao Yu ; Wen Jia ; Zhihua Wang
Author_Institution :
Inst. of Microelectron. & Tsinghua Nat. Lab. for Inf. Sci. & Technol., Tsinghua Univ., Beijing, China
Abstract :
A 2.4GHz stacked CMOS power amplifier (PA) with mode switching scheme is proposed to improve back-off efficiency in WLAN applications. The mode switching scheme effectively improves the PAE by 100% at 5dB back-off power by dynamically tuning the PA bias and optimal load with a power detecting controller. With the transistor-stacking and self-biasing techniques and powered by a 5.6V supply, the PA in high power mode (HPM) and low power mode (LPM) achieves the output P1dB of 27dBm with a PAE of 26.1% and 22dBm with a PAE of 21.8%, respectively, while occupying only 1.5mm2 die area in 180-nm CMOS process. In the closed-loop power detecting (PD) mode, the PA achieves -26.9dB EVM at 23dBm output power with 40MHz bandwidth 802.11n signals.
Keywords :
CMOS integrated circuits; UHF amplifiers; power amplifiers; power control; switching circuits; wireless LAN; HPM; LPM; PA bias; PAE improvement; PD mode; WLAN applications; back-off power efficiency improvement; bandwidth 40 MHz; closed-loop power detecting mode; efficiency 21.8 percent; efficiency 26.1 percent; efficiency-enhanced stacked CMOS power amplifier; frequency 2.4 GHz; high power mode; low power mode; mode switching scheme; optimal load; power detecting controller; self-biasing techniques; size 180 nm; transistor-stacking techniques; voltage 5.6 V; CMOS integrated circuits; IEEE 802.11n Standard; Power amplifiers; Power generation; Switches; Transistors; Wireless LAN;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2014 IEEE Proceedings of the
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2014.6946097
