Patent ID: 6693496
Filing Date: 2004-02-17
Classification: H03L

Abstract:
A self-adaptive method for controlling a self-biased PLL system, the method comprising the steps of:(a) providing an application-dependent input reference frequency; (b) providing a variable application-dependent number N where N is a decimal number representing the ratio between an output frequency and the application-dependent input frequency to the PLL systems; (c) synthesizing an output signal whose frequency is N times that of the application-dependent input reference frequency by a phase locked loop (PLL); (d) generating a first charge pump output signal in response to a phase-frequency detector output signal by a first charge pump coupled to a phase-frequency detector; and (e) generating a second charge pump output signal in response to the phase-frequency detector output signal by a second charge pump coupled to said phase-frequency detector, wherein the second charge pump has an effective resistance suitable for adjusting a bandwidth and a damping factor that are each tracked with respect to any of a number of process or voltage or temperature variations.