FULLY DIGITAL DOMAIN INTEGRATED FREQUENCY MONITOR

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FULLY DIGITAL DOMAIN INTEGRATED FREQUENCY MONITOR

This abstract first appeared for US patent application 20250004024 titled 'FULLY DIGITAL DOMAIN INTEGRATED FREQUENCY MONITOR

Original Abstract Submitted

technologies directed to determine whether a frequency of a clock signal is outside a specified frequency range are described. one integrated circuit includes a signal generator circuit, a voltage divider circuit, and digital logic circuitry. the signal generator circuit generates phase signals from a clock signal. the voltage divider circuit converts a frequency of the clock signal to a voltage representing the frequency. the voltage divider circuit includes a first resistor and a first switched-capacitor structure to receive the phase signals. an average resistance of the first switched-capacitor structure is inversely proportional to the frequency of the clock signal. the digital logic circuitry can determine, using the voltage, whether the frequency is outside of a specified frequency range, and output an indication responsive to the frequency being outside the specified frequency range.