Title :
An Efficient Mixed-Signal 2.4-GHz Polar Power Amplifier in 65-nm CMOS Technology
Author :
Chowdhury, Debopriyo ; Ye, Lu ; Alon, Elad ; Niknejad, Ali M.
Author_Institution :
Berkeley Wireless Res. Center, Univ. of California, Berkeley, CA, USA
Abstract :
A 65-nm digitally modulated polar transmitter incorporates a fully integrated, efficient 2.4-GHz switching Inverse Class-D power amplifier. Low-power digital filtering on the amplitude path helps remove spectral images for coexistence. The transmitter integrates the complete LO distribution network and digital drivers. Operating from a 1-V supply, the PA has 21.8-dBm peak output power with 44% efficiency. Simple static predistortion helps the transmitter meet EVM and mask requirements of 802.11g 54-Mb/s WLAN data with 18% average efficiency.
Keywords :
CMOS integrated circuits; UHF integrated circuits; UHF power amplifiers; digital filters; low-power electronics; radio transmitters; 802.11 WLAN data; CMOS technology; EVM requirements; LO distribution network; bit rate 54 Mbit/s; digital drivers; digitally modulated polar transmitter; efficiency 18 percent; efficiency 44 percent; frequency 2.4 GHz; low-power digital filtering; mask requirements; mixed-signal polar power amplifier; size 65 nm; static predistortion; switching inverse class-D power amplifier; voltage 1 V; Harmonic analysis; Impedance; Inductance; Switches; Transistors; Transmitters; Windings; Digital filters; OFDM; mixed analog–digital integrated circuits; power amplifiers; predistortion; switching circuits; transformers;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2011.2155790
