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Design of an inductor-less wideband variable-gain amplifier (VGA) using a cell-based strategy is presented. The VGA has a measured gain range of 24 dB, of which 17.3 dB is dB-linear with less than ±0.3 dB gain error. The −3 dB bandwidth is from 2 GHz to 2.2 GHz for the entire dB-linear range. An output 1 dB compression point of 1.8 dBm and a noise figure of 24 dB are measured. Due to the simple structure,...
This paper presents a highly efficient GaN Doherty power amplifier (DPA) with 100 MHz signal bandwidth and 40 dBm average output power for 3.5 GHz LTE-Advanced application. The carrier and peaking amplifiers are fabricated using 60-W GaN HEMT and implemented with unequal saturation power (Psat) in order to maintain high efficiency at large backed-off power (BOP). The highest drain efficiency (DE)...
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