In this paper, a novel coupler/reflection-type programmable electronic impedance tuner\ncombined with switches that were fabricated by a 0.18-um complementary metalâ??oxideâ??\nsemiconductor (CMOS) silicon-on-insulator (SOI) process is proposed for replacement of the\nconventional mechanical tuner in power amplifier (PA) load-pull test. By employing the multistacked\nfield-effect transistors (FETs) as a single-branch switch, the proposed tuner has the\nadvantage of precise impedance variation with systematic and magnitude and phase adjustment.\nAdditionally, it led to high standing wave ratio (SWR) coverage and a good impedance resolution\nwith a high power handling capability. Furthermore, the double-branch based on multi-stacked FET\nwas applied to switches for additional enhancement of the intermodulation distortion (IMD)\nperformance through the mitigated drain-source voltage of the single-FET. ..................................
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