Title :
A 2.4GHz class-D power amplifier with conduction angle calibration for −50dBc harmonic emissions
Author :
Ao Ba ; Chillara, Vamshi Krishna ; Yao-Hong Liu ; Kato, Haruhisa ; Philips, K. ; Staszewski, Robert Bogdan
Author_Institution :
IMEC-Holst Centre, Eindhoven, Netherlands
Abstract :
We present a digitally-controlled class-D power amplifier (PA) utilizing a new conduction angle calibration technique for harmonic suppression. The optimum conduction angle is derived to minimize chosen harmonics. The calibration circuit adjusts the conduction angle by changing the voltage transfer characteristic of the input buffer. Operating at 2.4GHz, this single-ended PA achieves a drain efficiency of 39% with an output power of 1.2dBm from a 1V supply. The even-order harmonics can be suppressed to below -49dBm. Integrated with an RF frequency modulator, the PA fully meets the spectral mask requirements for Bluetooth Smart applications.
Keywords :
Bluetooth; UHF power amplifiers; calibration; harmonics suppression; Bluetooth Smart applications; RF frequency modulator; calibration circuit; conduction angle calibration technique; digitally-controlled class-D power amplifier; efficiency 39 percent; even-order harmonics; frequency 2.4 GHz; harmonic suppression; single-ended PA; spectral mask requirements; voltage 1 V; voltage transfer characteristic; CMOS integrated circuits; Calibration; Harmonic analysis; Power amplifiers; Power generation; Power harmonic filters; Transistors; Bluetooth; energy efficiency; harmonic distortion; power amplifiers; radio transmitters;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium, 2014 IEEE
Conference_Location :
Tampa, FL
Print_ISBN :
978-1-4799-3862-9
DOI :
10.1109/RFIC.2014.6851708
