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This work presents a 5-GHz power amplifier (PA) based on a tsmc™ 0.35-µm SiGe heterojunction bipolar transistor (HBT) process. The PA adopts an on-chip linearizer as a feedforward element that cancels third-order distortion at the PA output. The PA achieves an output 1-dB compression point (OP1dB) of 27 dBm, a power gain of 21.9 dB, and a power added efficiency of 31 %. Compared to a PA without a...
This paper proposes a 2.4 GHz SiGe HBT differential power amplifier (PA) with a novel on-chip variable gain active predistorter (PD) for linearity enhancement. The fully differential active PD provides an open collector adaptive bias control which can effectively enhance the linearity while improve power added efficiency (PAE). The PA with active PD achieves an output 1-dB compression (OP1dB) of 20...
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