Chang Y.-TWang W.-YHSIN-CHIA LU2021-09-022021-09-022020https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100823281&doi=10.1109%2fAPMC47863.2020.9331435&partnerID=40&md5=cf3e98bc04793cf1b70a539bb5f8dbb6https://scholars.lib.ntu.edu.tw/handle/123456789/580845In this paper, we present a vector-sum phase shifter for satellite communication at 19 GHz. The ±I/±Q signals for phase synthesis by vector adder are generated by an active current-mode 90° coupler and two reflection-type bi-phase modulators. In order to save area, we use the single-ended two branches quadrature structure to replace the Gilbert-cell type vector-sum phase shifter. In addition, we use the tail current source tofix the total current for vector adder. The measured average peak gain is -1.2 dB at 19 GHz. The measured average IP1db is better than -17 dBm. The 3-dB bandwidth is from 18.1 to 19.9 GHz. Total de power consumption is only 10 mW for 1.8 V supplied voltage. To our best knowledge, this phase shifter has good gain and low RMS amplitude and phase error among active phase shifter. ? 2020 IEEE.Adders; Modulators; Phase modulation; Satellite communication systems; Vectors; Active phase shifter; Amplitude and phase error; Bi-phase modulators; Phase synthesis; Reflection type; Satellite communications; Tail current source; Vector sum phase-shifters; Phase shiftersconference paper10.1109/APMC47863.2020.93314352-s2.0-85100823281