32.2 A 24.25-to-29.5GHz Extremely Compact Doherty Power Amplifier with Differential-Breaking Phase Offset Achieving 23.7% PAE<sub>avg</sub> for 5G Base-Station Transceivers
Hansik Oh, Seungwon Park, Jooseok Lee, Seungjae Baek, Joonho Jung, Tae‐Wan Kim, Jin-Hyun Kim, Woo‐Jae Lee, Jaehong Park, Kihyun Kım, Donghyun Lee, Sangho Lee, Jeong Ho Lee, Ji Hoon Kim, Young‐Hwan Kim, Sang‐Yong Park, Bohee Suh, Soyoung Oh, Dongsoo Lee, Sehyug Jeon, Juho Son, Sung-Gi Yang
Abstract
A beamforming phased-array has become an indispensable configuration in 5 G new-radio (NR) frequency-range-2 (FR2) cellular communications to boost an equivalent isotropic radiated power. In order to miniaturize the beamforming phased array with high output power, a beamforming transceiver IC should be highly integrated with multiple channels. Silicon-based power amplifiers (PAs) have been widely used to increase the degree of integration with transceiver ICS; however, they still suffer from low power added efficiencies at an average output power ($\mathrm{PAE}_{\text {avg }}$) due to large peak-to-average power ratios (PAPRs) of ~10 dB[1–3]. In order to improve the $\mathrm{PAE}_{\mathrm{avg}}$ of the PA over the mm-wave frequency range, Doherty PAs have been considered as good candidates [4–6]. Nevertheless, the Doherty PA faces several challenges for high integration due to the following reasons: complex structure and bulky size. Especially, the extensive size immediately increases costs of a beamforming transceiver IC.