Title :
A Switched-Capacitor RF Power Amplifier
Author :
Yoo, Sang-Min ; Walling, Jeffrey S. ; Woo, Eum Chan ; Jann, Benjamin ; Allstot, David J.
Author_Institution :
Dept. of Electr. Eng., Univ. of Washington, Seattle, WA, USA
Abstract :
A fully integrated switched-capacitor power amplifier (SCPA) utilizes switched-capacitor techniques in an EER/Polar architecture. It operates on the envelope of a nonconstant envelope modulated signal as an RF-DAC in order to amplify the signal efficiently. The measured maximum output power and PAE are 25.2 dBm and 45%, respectively. When amplifying an 802.11g 64-QAM orthogonal frequency-division multiplexing (OFDM) signal, the measured error vector magnitude is 2.6% and the average output power and power-added efficiencies are 17.7 dBm and 27%, respectively.
Keywords :
OFDM modulation; digital-analogue conversion; power amplifiers; quadrature amplitude modulation; switched capacitor networks; 802.11g 64-QAM; EER-polar architecture; OFDM signal; RF-DAC; efficiency 27 percent; efficiency 45 percent; error vector magnitude; fully integrated switched-capacitor power amplifier; nonconstant envelope modulated signal; orthogonal frequency-division multiplexing; CMOS integrated circuits; CMOS technology; Capacitors; Power amplifiers; Power generation; Radio frequency; Switching circuits; CMOS; Class-D; RF DAC; SCPA; envelope elimination and restoration (EER); linearization; polar transmitter; power amplifiers; power-added efficiency; switched-capacitor circuits;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2011.2163469
