Silicon Laboratories Inc.
Oscillator with dynamic gain control

Abstract:

In one form, an oscillator includes an oscillator core circuit and a dynamic gain control circuit. The oscillator core circuit is for connection to a frequency reference element and provides a first clock signal using a negative gain element having a gain determined by a gain control signal. The dynamic gain control circuit is coupled to the oscillator core circuit for calibrating the gain control signal to a startup value based on oscillations reaching a first threshold during a startup state, and calibrating the gain control signal to a steady-state value based on oscillations falling to a second threshold after an end of the startup state and before entering a steady state. The first threshold is higher than the second threshold. The dynamic gain control circuit operates the oscillator core circuit during the steady state using the steady-state value.