To reduce the background noise affected during single photon detection, a gating quenched circuit is used to quench the avalanche signal. The differential noise generated by the high frequency gating signal is stacked with the weak avalanche signal, which is not conducive for subsequent detection, counting and other operations. Therefore, it is crucial to extract the weak avalanche signal from the aliasing signal. By analyzing the causes of differential noise on the sampling resistance of the gating quenching circuit, this paper adopts the method of combining the capacitor balance differential circuit and the resistance filter circuit, designs the 500 MHz high frequency sinusoidal gating quenching circuit and its subsequent filtering, amplification and shaping circuit, extracts the avalanche signal from the stacked signal and output the 5V digital level signal, solves the frequency upper limit of the capacitor balance differential circuit, reduces the difficulty of avalanche signal processing circuit design, continuously adjusts the frequency of the gating signal in the range of resistance, and improves the overall stability of the circuit. Simulation results show that the suppression ratio of the gated signal is up to 88dB, which solves the aliasing problem of avalanche signal and differential noise.