System and method for controlling an oscillator

摘要

An oscillator(40) controls the frequency of an output clock signal (50) in response to detecting an error in the frequency of an input clock signal (52). The oscillator (40) includes an inverter operable to generate a voltage signal and a resonator coupled to the inverter operable to introduce a phase shift in the voltage signal. The oscillator (40) also includes a variable impedance positioned across a feedback path of the inverter and operable to introduce a further phase shift in the voltage signal in response to the detected error. The resonator is further operable to adjust the frequency of the voltage signal in response to the introduced further phase shift. The voltage signal (40) is used as the output clock signal(14). <IMAGE>