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

fYear

2014

fDate

1-3 June 2014

Firstpage

239

Lastpage

242

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits Symposium, 2014 IEEE

Conference_Location

Tampa, FL

ISSN

1529-2517

Print_ISBN

978-1-4799-3862-9

Type

conf

DOI

10.1109/RFIC.2014.6851708

Filename

6851708