A Predistortion-Less Digital Transmitter With −50-dB ACLR Exploiting Output Conductance Linearization

Switched capacitor power amplifiers (SCPAs) are a class of digital transmitters which have shown promising results for high linearity with good DE. Their is limited by AM-PM distortion, caused difference in output conductance switching and non-switching driver cells. Often, DPD required to transmit higher order modulation schemes. In this letter, cell implementation as an inverter drain resistors proposed has equal both cases, aiming eliminate distortion. An SCPA these cells implemented 22nm FDSOI CMOS process demonstrates excellent DPD-less ACLR –50 dB EVM –45.5 5 MHz 1024 QAM signals at DE 8.8%. A matching network exploiting bondwires high-Q inductors removes on-chip significantly reduces chip area.