1.9-GHz CMOS Power Amplifier using Adaptive Biasing Technique at AC Ground

• Published in: Journal of Information and Communication Convergence Engineering, 17(4) Vol. 17; no. 4; pp. 285 - 289
• Main Authors: Inseong Kang, Jinho Yoo, Changkun Park
• Format: Journal Article
• Language: English
• Published: 한국정보통신학회JICCE 01.12.2019; 한국정보통신학회
• Subjects: 전자/정보통신공학; AC ground; Differential; Adaptive biasing; Amplifier; Second harmonic
• ISSN: 2234-8255; 2234-8883
• DOI: 10.6109/jicce.2019.17.4.285

A 1.9-GHz linear CMOS power amplifier is presented. An adaptive bias circuit (ABC) that utilizes an AC ground to detect the power level of the input signal is proposed to enhance the linearity and efficiency of the power amplifier. The ABC utilizes the second harmonic component as the input to mitigate the distortion of the fundamental signal. The input power level of the ABC was detected at the AC ground located at the VDD node of the power amplifier. The output of the ABC was fed into the inputs of the power stage. The input signal distortion was mitigated by detecting the input power level at the AC ground. The power amplifier was designed using a 180 nm RFCMOS process to evaluate the feasibility of the application of the proposed ABC in the power amplifier. The measured output power and power-added efficiency were improved by 1.7 dB and 2.9%, respectively. KCI Citation Count: 0