Patent ID: 7432751
Filing Date: 2008-10-07
Classification: G01R,H03D,H03L

Abstract:
1. A circuit for generating a periodic waveform, comprising: a digital phase detector having an input for receiving a multi-bit, discrete-time sampled feedback signal and an output for providing a digital phase error signal indicative of a difference in phase between the multi-bit, discrete-time sampled feedback signal and a digital oscillatory signal; a digital loop filter having an input and an output, the input coupled to the output of the digital phase detector; a VCO having an input and an output, the input coupled to the output of the loop filter; and an ADC having an input and an output, the input coupled to the output of the VCO and the output coupled to the input of the digital phase detector for providing the multi-bit, discrete-time sampled feedback signal, wherein the digital phase detector includes