| 摘要 |
<p>A system provided for controlling an output frequency of a voltage controlled oscillator (44) relative to a reference frequency. A method includes the steps of detecting a phase error between a divided output of the VCO (44) and the reference frequency (54), pumping a frequency control input of the voltage controlled oscillator with the phase error and adjusting a pumping gain based upon a magnitude of the frequency control input to the voltage controlled oscillator. The apparatus includes a phase detector 852) adapted to detect the phase error between the divided output of the voltalge controlled oscillator and the reference frequency and a charge pump (50) adapted to pump the frequency control input of the voltage controlled oscillator with the phase error. The apparatus also includes a gain controller (58) adapted to adjust the pumping gain based upon the magnitude of the frequency control input to the VCO.</p> |
