Patent ID: 7061276

Claim:
A phase detector, comprising: an input for receiving a sampled signal having a frequency and phase; a calculation unit having an input and first and second outputs, the input being adapted for receiving a value indicative of a predetermined frequency and phase; a digital oscillator having an input coupled to the first output of the calculation unit, for generating a reference signal responsive to the value indicative of a predetermined frequency and phase; an accumulator having an input and an output, the input being coupled to the second output of the calculation unit; a down-converter, coupled to the input of the phase detector and to the digital oscillator, for generating a quadrature difference signal, the quadrature difference signal having a frequency indicative of a difference between the frequency of the sampled signal and the frequency of the reference signal, and a phase indicative of a difference between the phase of the sampled signal and the phase of the reference signal; a phase extractor, having first and second inputs coupled to the down-converter for receiving the quadrature difference signal, and an output for generating values indicative of a cumulative phase of the quadrature difference signal; a summer having a first input coupled to the output of the phase extractor, a second input coupled to the output of the accumulator, and an output for producing a sum of the output of the phase extractor and the output of the accumulator.