Design methodology of tunable impedance matching circuit with SOI CMOS tunable capacitor array for RF FEM

Abstract

For the tunable RF FEMs or Antennas, analysis on optimal design of tunable capacitors which consist of MIM capacitors and RF CMOS switches is performed in terms of quality factor, tuning ratio and harmonics. To handle up to +36dBm RF signal, the Stacked-FET and series Capacitor-Transistor-Capacitor (CTC) configuration applied Coupled-Bias(CB) are proposed, which in addition to being high-linearity can eliminate a negative voltage generator. Using the designed tunable capacitors, optimal tunable matching circuit is proposed.