Clock frequency adjusting method and circuit

摘要

A method for adjusting an oscillator clock frequency, comprising: providing a first oscillator, applying a first setpoint value to the first oscillator, determining a first oscillator frequency value within a first time frame, providing a second oscillator, applying a second setpoint value to the second oscillator, determining a second oscillator frequency value within a second time frame, determining a new frequency setpoint value from the first and second frequency values, the first and second setpoint values, and a desired frequency value, and applying the new frequency setpoint value to one of the first and second oscillators.

主权项

1. A method for adjusting an oscillator clock frequency to a desired frequency using first and second oscillators responsive to first and second setpoints, the method comprising:
configuring the first and second oscillators to have a same frequency-setpoint response curve, applying a first setpoint value to the first oscillator, measuring a first frequency value of the first osciallator, applying a second setpoint value, different from the first setpoint value, to the second oscillator, measuring a second frequency value of the second oscillator, determining the response curve of the oscillators from the first and second frequency values and the first and second setpoint values, extrapolating a new frequency setpoint value from the response curve and a desired frequency parameter, and applying the new frequency setpoint value to one of the first and second oscillators.