0.18-μm CMOS Bluetooth analog receiver with -88-dBm sensitivity

A CMOS Bluetooth analog low-IF receiver that includes a low-noise amplifier, image-rejection mixer, IF bandpass active filter, and programmable gain amplifier (PGA) was fabricated in a 0.18-μm bulk CMOS process. In order to achieve good sensitivity and tolerance against blocking signals, operational amplifiers were used in the active filter and PGA, the filter and PGA were interleaved to minimize noise, and an on-chip automatic tuner adjusts the filter frequency. Other features included a feedforward automatic gain control with rapid convergence. When connected to the digital demodulator of a BiCMOS Bluetooth transceiver, -88-dBm sensitivity was measured at 65-mW power dissipation. All blocking signal specifications were also satisfied.