Title :
A CMOS switching power amplifier for ΔΣ digitized polar RF transmitter
Author :
Paek, Ji-Seon ; Lee, Hyun-Yong ; Lee, Hongtak ; Hong, Songcheol
Author_Institution :
Sch. of EECS, Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea
Abstract :
A CMOS switching power amplifier for ΔΣ digitized polar RF transmitter is implemented in 0.18-μm process. A current source is introduced in the proposed switching PA to achieve ΔΣ digitized amplitude modulation. The modulation with the current source is suitable for high speed modulated signal such as an oversampled ΔΣ signal. The PA operates at 910 MHz with the maximum output power of 23.5 dBm and power efficiency of 55.4% at the maximum output power. The maximum output power range with the current source modulation is 31 dB.
Keywords :
CMOS analogue integrated circuits; amplitude modulation; delta-sigma modulation; power amplifiers; radio transmitters; ΔΣ digitized polar RF transmitter; CMOS switching power amplifier; current modulation; digitized amplitude modulation; frequency 910 MHz; size 0.18 micron; Amplitude modulation; CMOS technology; Communication switching; Digital modulation; Linearity; Power amplifiers; Power generation; Radio frequency; Radio transmitters; Radiofrequency amplifiers; Current modulation; polar transmitter; sigma-delta; switch-mode CMOS power amplifier;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2010 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-4725-1
Electronic_ISBN :
978-1-4244-4726-8
DOI :
10.1109/RWS.2010.5434218
