Title :
A Class-E PA With Pulse-Width and Pulse-Position Modulation in 65 nm CMOS
Author :
Walling, Jeffrey S. ; Lakdawala, Hasnain ; Palaskas, Yorgos ; Ravi, Ashoke ; Degani, Ofir ; Soumyanath, Krishnamurthy ; Allstot, David J.
Author_Institution :
Depatment of Electr. Eng., Univ. of Washington, Seattle, WA
fDate :
6/1/2009 12:00:00 AM
Abstract :
A class-E power amplifier (PA) utilizes differential switches and a tuned passive output network improves power-added efficiency (PAE) and insensitivity to amplitude variations at its input. A modulator is introduced that takes outphased waveforms as its inputs and generates a pulse-width and pulse-position modulated (PWPM) signal as its output. The PWPM modulator is used in conjunction with a class-E PA to efficiently amplify constant envelope (e.g., GMSK) and non-constant envelope (e.g., QPSK, QAM, OFDM) signals with moderate peak-to-average ratios (PAR). The measured maximum output power of the PA is 28.6 dBm with a PAE of 28.5%, and the measured error vector magnitude (EVM) is 1.2% and 4.6% for GMSK and pi/4-DQPSK (PAR ap 4 dB) modulated signals, respectively.
Keywords :
CMOS integrated circuits; minimum shift keying; power amplifiers; pulse position modulation; pulse width modulation; quadrature phase shift keying; CMOS; DQPSK; GMSK; class-E PA; differential switches; error vector magnitude; power amplifier; power-added efficiency; pulse-position modulation; pulse-width modulation; size 65 nm; tuned passive output network; Differential amplifiers; OFDM modulation; Peak to average power ratio; Power amplifiers; Power measurement; Pulse amplifiers; Pulse generation; Pulse modulation; Space vector pulse width modulation; Switches; Class-E; linearization; outphasing; power amplifier; power-added efficiency; pulse-position modulation; pulse-width modulation;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2009.2020205
