A Coupler-Based Differential Doherty Power Amplifier with Built-In Baluns for High Mm-Wave Linear-Yet-Efficient Gbit/s Amplifications

被引：22

作者：

Huy Thong Nguyen ^{[1
]}

Wang, Hua ^{[1
]}

机构：

[1] Georgia Inst Technol, Atlanta, GA 30332 USA

来源：

2019 IEEE RADIO FREQUENCY INTEGRATED CIRCUITS SYMPOSIUM (RFIC) | 2019年

关键词：

60GHz; adaptive bias; coupler; coupler-based balun; CMOS; dynamic bias; Doherty; mm-Wave; power amplifier;

D O I：

10.1109/rfic.2019.8701814

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We propose a Doherty power amplifier architecture with impedance inverting balun and impedance scaling balun to support Doherty active load modulation and Power Back-Off (PBO) efficiency enhancement at high mm-Wave frequencies. Unlike transformer baluns often used at RF frequencies, mm-Wave coupler-based baluns are employed to provide well balanced differential-to-single-ended conversion and absorb device output parasitic capacitance. Moreover, this paper reports that coupler-based balun with 45 degrees electrical length exhibits impedance inverting behavior, which is utilized to construct Doherty active load modulation network in the reported PA design. Adaptive biasing circuit further enhances the Main/Auxiliary PA cooperation. The measured Doherty PA exhibits 20.1dBm P-sat, 19.3dBm P-1dB, and 26% peak PAE. At 7dB PBO, the measured PAE is 16.6%, demonstrating 1.45x efficiency enhancement compared to an ideal class-B PA with the same peak PAE at P-1dB.

引用

页码：195 / 198

页数：4