A 0.5V GFSK 200μW limiter/demodulator with bulk-driven technique for Low-IF bluetooth

This paper presents a low-voltage IF processor including a limiter and a DLL-based demodulator for bluetooth receiver. The limiter amplifies the received IF signals with constant envelope. The demodulator detects and manipulates the edges of the IF signal. To achieve 0.5V operation the bulk-driven technique are extensively used in amplifier design nd more digital-like operations are used in demodulator. With the IF frequency of 3MHz, the power consumption of the limiter and demodulator is only 200μW. The core area is 0.36 mm² using a standard 0.18-μm CMOS process. Measurement result shows that a 18.7-dB input signal-to-noise ratio is obtained for a 0.1% bit error rate.