Importance

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Abstract

A signal generation circuit comprises a VCO configured to generate a signal with a frequency corresponding to a control voltage; a divider configured to generate a divided signal by dividing the frequency of the signal generated by the VCO; a phase comparator configured to compare a reference clock signal generated by a reference oscillator and the divided signal generated by the divider; a charge pump configured to output a current corresponding to a comparison result of the phase comparator; a loop filter configured to generate a voltage corresponding to the current output by the charge pump; a switched capacitor filter configured to generate, by sampling the voltage generated by the loop filter, a control voltage of the VCO in a steady state; and an initial-value provision circuit configured to provide an initial value of the control voltage of the VCO.

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