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An AM-PM Compensation of Cross-Coupled Capacitance Neutralization Technique in a Differential Power Amplifier
IEICE TRANSACTIONS on Electronics
Publication Date: 2022/10/01
Online ISSN: 1745-1353
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
power amplifiers, GaN, phase compensation, K-band,
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In this study, AM-PM compensation of the cross-coupled capacitance neutralization technique is discussed. Cgd neutralization leads to AM-PM compensation of a power amplifier with negligible change of AM-AM characteristics. AM-PM compensation was confirmed via circuit analysis and measurements. The formulation analysis showed that AM-PM compensation can be derived via gm variation against input power with capacitance neutralization. A differential power amplifier with capacitance neutralization was fabricated with GaN high-electron-mobility transistors. The AM-PM characteristic of the fabricated differential power amplifier was measured at 17.7 GHz. It showed AM-PM reduction of 22° at compared to a single-phase power amplifier without capacitance neutralization at output power of 35 dBm.