Patent ID: 7936192
Filing Date: 2011-05-03
Classification: H03B,H03K,H03L

Abstract:
1. A frequency synthesizer, comprising: (a) a phase detector having as inputs a reference frequency signal and a feedback signal, the phase detector being operable to generate a phase detection signal based on a comparison of phases between the reference frequency signal and the feedback signal; (b) a loop filter coupled to the phase detector for receiving the phase detection signal, generating a loop filter output signal; (c) an oscillator with frequency controlled by the loop filter output signal, generating an oscillator signal; (d) and a feedback circuit coupled to the oscillator signal for generating the feedback signal, the feedback circuit comprising a regenerative sampling latch circuit, the regenerative sampling latch circuit clocked by a sampling frequency that is less than the frequency of the oscillator signal to generate a regenerative sampling latch circuit output signal, wherein the feedback signal is derived from the regenerative sampling latch circuit output signal.