A 8.12mm<sup>2</sup> 0.1-4GHz receiver and 0.1~6GHz transmitter with reconfigurable 10~100MHz signal bandwidth in 65nm CMOS is presented. Rx features two single-ended LNAs in parallel, passive current down-conversion with 25% duty-cycle LOs, 5th/7th-order reconfigurable baseband filtering and IIP2/frequency tuning/IQ calibration. It achieves NF of 3~8dB over 0.1-4GHz and 21mA current consumption for 2.3GHz LTE with 20MHz signal bandwidth. Fully-integrated Tx features reconfigurable PPAs with transformer differential-single-ended conversion output, a low-noise sub-path and high dynamic range main-path as well as LO leakage and image rejection calibration. It achieves 1.7% EVM for 1.8GHz WCDMA with 1.5dBm output power, -31/-51 ACLR1/ACLR2 for 2.3GHz LTE with 20MHz bandwidth at 3dBm output power, <;-42dBc LO feedthrough and >;51dBc image rejection.