Broadband dynamic spectrum access in the sub-GHz band emerges as a potential solution for deploying low-cost range-enhanced wireless connectivity, suitable for under/less-developed countries. This paper describes a sub-GHz wireless transmitter (TX) with an integrated multi-class-linearized power amplifier (PA) compliant with the IEEE 802.11af wireless local-area network. It features a wideband in-phase/quadrature (I/Q) modulator exploiting two-stage 6-/14-path harmonic-rejection mixers plus low-pass filters to manage the spurs emission induced by hard-switched mixing. The entailed 8/16-phase local oscillator (LO) is generated by injection-locked phase correctors plus frequency dividers to relax the frequency and tuning range of the reference LO. The linearized PA features overdriven-class-A/B/C cells to balance the power efficiency and linearity; a dual-gate input pair to enlarge the linear gain range; and a wideband low-impedance ground at the second harmonic to suppress the harmonic distortion and ground bounces. The wideband I/Q imbalance and LO feedthrough are resolved by automatic digital calibration, which incorporates time-domain parameter estimation for better computational efficiency. Benchmarking with the recent art, this solution fabricated in 65-nm CMOS exhibits highe