Patent ID: 7283001

Claim:
A noise-shaping amplifier, comprising: phase detection circuitry operable to receive an input signal characterized by an input frequency, the phase detection circuitry being operable to detect a phase difference between the input signal and a feedback signal and generate a control signal representative of the phase difference; filter circuitry characterized by a filter response corresponding to a band of interest, the filter circuitry being operable to filter the control signal; voltage-controlled oscillator (VCO) circuitry operable to receive the filtered control signal and generate an output signal in response thereto, the output signal being characterized by an output frequency which is substantially locked to the input frequency, the VCO circuitry including an output power stage; and feedback circuitry operable to provide the feedback signal to the phase detection circuitry, the feedback circuitry further being operable in conjunction with at least some of the phase detection circuitry, the filter circuitry, and the VCO circuitry to move at least some distortion generated by the output power stage outside of the band of interest.