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A 0.1-5.0 GHz 65 nm CMOS reconfigurable transmitter for private network wireless communications is presented. The transmitter integrates a 0.1-1.5 GHz high-efficiency dual-mode power amplifier to support low-cost narrowband applications and a 0.45-5.0 GHz efficiency-optimized pre-power amplifier to support high-performance wideband applications. A wideband PLL frequency synthesizer, DACs with reconfigurable sampling rate and the reconfigurable digital baseband processing with standard JESD207 interface are all included to implement the highly-integrated transmitter. Specifically, 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 verifications 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 floor and power consumption compared with the state-of-the-art reconfigurable transmitters.