Power-Amplifier Stabilization Through Out-of-Band Feedback

• DOI: 10.1109/lmwc.2020.3002727
• Publication Date: 2020-06-24T20:59:30Z
• Authors: William Sear; Taylor W. Barton
• Keywords: Wideband; SIGNAL (programming language); Frequency band; Negative feedback amplifier

This letter presents a power-amplifier (PA)-stabilization technique based on the low-frequency out-of-band feedback. The proposed structure replaces conventional stability network to ensure unconditional at frequencies up radio-frequency (RF) operating band, with in- and above-band stabilized through matching design. approach offers an alternative inserting lossy components in RF signal path, which can significantly degrade realizable in-band gain of amplifier. 900-MHz proof-of-concept PA 10-W gallium-nitride (GaN) device is characterized under continuous-wave (CW) Wideband Code Division Multiple Access (W-CDMA) excitations realizes 25.6-dB small-signal 73% power added efficiency (PAE) P3dB.