A mixed-signal GFSK demodulator for Bluetooth

Abstract

A discrete-time mixed-signal Gaussian frequency-shift keying demodulator designed for a low intermediate frequency Bluetooth receiver performs FSK demodulation. Employing passive sampling and time-domain differentiation techniques, the demodulator performs quadrature demodulation while tolerating up to 200-kHz frequency offset. A distributed array of interleaved sampling circuits and a low-voltage multiplier allow both low-voltage operation and low power dissipation. Fabricated in a CMOS 0.25-/spl mu/m technology, the demodulator only dissipates 6 mW from a 2-V power supply.