Lu B.-ZWu Y.-CChiong C.-CWang H.HUEI WANG2021-09-022021-09-022019https://www.scopus.com/inward/record.uri?eid=2-s2.0-85078046872&doi=10.1109%2fRFIT.2019.8929200&partnerID=40&md5=2bca17a7ca4085c14b1012055798e000https://scholars.lib.ntu.edu.tw/handle/123456789/580882A W-band power amplifier (PA) for radio astronomical receiver LO chain in 0.1-μm GaAs pHEMT technology is presented in this paper. This PA is a 3-stage common source design using transmission lines to implement matching network. In order to increase the bandwidth, two sections matching networks for output are utilized to maintain the matching loci within the Q = 1 contour of Smith chart. A 90 degrees Lange coupler is employed to enhance the bandwidth and to combine the output power. The chip size with all pads is 2×1.5 mm2. From the measurement results, the proposed PA achieves 11.5-dB small signal gain with 15-GHz 3-dB bandwidth (78-93 GHz), saturated output power (Psat) of 19.6 dBm, output 1-dB compression point (OP1dB) of 18.2 dBm, and maximum power added efficiency (PAEpeak) of 12.8%. ? 2019 IEEE.Bandwidth; Bandwidth compression; Gallium arsenide; High electron mobility transistors; III-V semiconductors; Monolithic microwave integrated circuits; Radio astronomy; Radio waves; Receivers (containers); Semiconducting gallium; 1dB compression point; Common source; Lange couplers; Matching networks; Maximum power; Radio-astronomical receivers; Saturated output power (Psat); Small signal gain; Power amplifiersconference paper10.1109/RFIT.2019.89292002-s2.0-85078046872