This brief presents low-complexity detectors for a zero-IF Bluetooth receiver based on a simple phase-domain analog-to-digital converter. Measurements and simulations prove that the detectors' sensitivity lies close to an ideal coherent Gaussian frequency-shift keying (GFSK) detector.

Simple but precise expressions are derived for jitter, and thus for phase noise, in inverter-based and differential ring oscillators. White and flicker noise are included. The expressions are validated by measurement and simulation.

The assumption that the white noise sources independently affect the phase noise and jitter in ring oscillators is revisited. Propagation of jitter originating from a noise source around the ring oscillator loop and its effect on phase noise are quantified. It is shown how, contrary to the commonly-held assumptions, the resulting jitter can in fact depend on the number of stages.

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