A crystal oscillator circuit includes an oscillator configured to generate a signal having an oscillation amplitude. A high-pass filter is configured to filter the output signal to generate a filtered output signal. An automatic gain control (AGC) module is configured to generate an initial gain control signal when the filtered output signal is not received by the AGC module. The high-pass filter is configured to prevent the filtered output signal from being received by the AGC module when the oscillation amplitude is substantially equal to zero. The AGC module is configured to generate a steady-state gain control signal when the filtered output signal is received by the AGC module. A gain stage is configured to provide a first amount of gain to the oscillator module based on the initial gain control signal and a second amount of gain to the oscillator module based on the steady-state gain control signal.