A 0.1-5.0 GHz Reconfigurable Transmitter With Dual-Mode Power Amplifier and Digitally-Assisted Self-Calibration for Private Network Communications

—A 0.1–5.0 GHz 65 nm CMOS recongurable transmitter for private network wireless communications is presented. The transmitter integrates a 0.1–1.5 GHz high-efciency dual-mode power amplier to support low-cost narrowband applications and a 0.45–5.0 GHz efciency-optimized pre-power amplier to support high-performance wideband applications. A wideband PLL frequency synthesizer, DACs with recongurable sampling rate and the recongurable digital baseband processing with standard JESD207 interface are all included to implement the highly-integrated transmitter. Specically, with the proposed digitally-assisted self-calibration technique for LO leakage and image rejection, the transmitter achieves 52 dBc LO leakage and 53 dBc image rejection ratio (IRR), showing 20 dB and 30 dB improvement compared with the un-calibrated cases, respectively. The system verications have demonstrated an EVM of 1.7% for 905 MHz EDGE with 19.5 dBm output power, and an EVM of 3.2% for LTE Band42 with 5.5 dBm output power. This proposed transmitter has achieved the comparable or even better performance in linearity, noise oor and power consumption compared with the state-of-the-art recongurable transmitters. Index Terms—C-IM3, CMOS, digitally-assisted self-calibration, dual-mode power amplier, private network wireless communications, recongurable, wireless transmitter.