A Novel Load Mismatch Detection and Correction Technique for 3G/4G Load Insensitive Power Amplifier Application
- 14 April 2015
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 63 (5), 1530-1543
- https://doi.org/10.1109/tmtt.2015.2417862
Abstract
This paper proposes a novel load mismatch detection and correction technique to develop a load insensitive power amplifier (PA). The presented algorithm for the technique can simply be implemented by handling load impedance as a region rather than a point. Based on the detection results, a tunable output matching network (TOMN) corrects a mismatched load and transforms it into a desired region, thereby dramatically enhancing PA performances under load mismatched condition with a minimal compromising at a matched load. The detectors and TOMN were simply implemented using a 0.18-μm silicon-on-insulator field-effect transistor, which were integrated with a 2-μm InGaP/GaAs HBT PA monolithic microwave integrated circuit into a single module. A PA module was implemented using more advanced impedance detectors having eight-phase regions, which was measured with WCDMA R'99 and 10-MHz 16QAM long-term evolution signals centered at 1.95 GHz for verification of the proposed idea. When compared to a conventional PA, excellent adjacent channel leakage ratio improvements of 12.7 and 8.3 dB, respectively, were achieved under output voltage standing-wave ratio (VSWR) of 2.5:1 for both applications. Moreover, the idea was extended for efficiency enhancement in a linearity spec-compliant impedance region, and the PA showed power-added efficiency improvements of 1.6% and 0.5%, respectively, under output VSWR of 2.5:1 for both applications.Keywords
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