A High-Efficient CMOS RF Power Amplifier With Automatic Adaptive Bias Control

• Published in: IEEE microwave and wireless components letters Vol. 16; no. 11; pp. 615 - 617
• Main Authors: Chen, Y.-J.E., Chih-Yun Liu, Tang-Nian Luo, Heo, D.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.2006; Institute of Electrical and Electronics Engineers
• Subjects: Adaptive bias; Adaptive control; Adaptive control systems; Amplifiers; Applied sciences; Automatic control; Bias; Circuit properties; Circuits; CMOS; CMOS technology; Design. Technologies. Operation analysis. Testing; Doherty power amplifier (PA); Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; High power amplifiers; Integrated circuit technology; Integrated circuits; Microwaves; Noise levels; orthorgonal frequency division multiplexing (OFDM); peak-to-average power ratio (PAPR); Power amplifiers; Power generation; Programmable control; Radio frequencies; Radio frequency; Radiofrequency amplifiers; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Performance evaluation; Output power; Control circuit; Peak to average power ratio; Doherty power amplifier (PA); Frequency division multiplexing; Adaptive control; Adaptive circuit; Degradation; CMOS; orthorgonal frequency division multiplexing (OFDM); Complementary MOS technology; Integrated circuit; Automatic control; Orthogonal frequency division multiplexing; Radiofrequency amplifiers; Adaptive bias; peak-to-average power ratio (PAPR); Power amplifier; Bias circuit; Damaging
• ISSN: 1531-1309; 1558-1764
• DOI: 10.1109/LMWC.2006.884909

A 2.4-GHz Doherty power amplifier (PA) is developed in 0.18-mum CMOS technology. An automatic adaptive bias control circuit is integrated with the auxiliary PA to improve the overall performance of the PA. Operated at 3V, the P 1 dB and associated power-added-efficiency (PAE) of the PA are 21dBm and 33%, respectively. At the output power 6-dB backoff from P 1 dB , the PAE remains 21%. The limited PAE degradation at backoff power levels makes the PA suitable for the applications with high peak-to-average power ratio