Patent ID: 10187072

Abstract:
The invention disclosed a signal processing system and method thereof, applicable to an environment providing accurate output frequency. By using the signal processing system, the stable output voltage (AMP OUT) of the error amplifier is inputted to the input of the voltage controlled oscillator (VCO), the output frequency (Fvco) of the VCO is provided to the input of fractional-N frequency divider for digital division. The output of the fractional-N frequency divider (Fo) is provided to the input of the frequency to voltage converter for frequency/voltage conversion. Then, the low pass filter is used to filter out the ripple of the output voltage (V1) of the frequency to voltage converter and the trebling jitter of the output of the fractional-N frequency divider. The signal processing system of the present invention utilizes the voltage locked loop property and digital frequency division to achieve accurate frequency output.