A fully integrated CMOS low-IF Bluetooth receiver is presented. The receiver consists of a radio frequency (RF) front end, a phase-locked loop (PLL), an active complex filter, a Gaussian frequency shift keying (GFSK) demodulator, and a frequency offset cancellation circuit. The highlights of the receiver include a low-power active complex filter with a nonconventional tuning scheme and a high-performance mixed-mode GFSK demodulator. The chip was fabricated on a 6.25-mm2 die using TSMC 0.35- m standard CMOS process. 82 dBm sensitivity at 1e-3 bit error rate, 10 dBm IIP3, and 15 dB noise figure were achieved in the measurements. The receiver active current is about 65 mA from a 3-V power supply.