the first signal generation module is connected to the oscillation module and is configured to generate a first voltage signal and a second voltage signal according to the first oscillation signal and the second oscillation signal, wherein, in a work cycle, the first voltage signal gradually decreases from a first electric potential that is higher than a supply voltage to a second electric potential that is lower than a threshold voltage, the second voltage signal gradually increases from a third electric potential that is lower than a common ground voltage to a fourth electric potential that is higher than the threshold voltage;

the oscillation module comprises a first switch, a second switch, a capacitor, and a comparison unit, a first end of the first switch being configured to receive the supply voltage, a second end of the first switch being connected to a first end of the capacitor and a first end of the comparison unit, a first end of the second switch being connected to ground, a second end of the second switch being connected to a second end of the capacitor and a second end of the comparison unit, a first input end of the comparison unit being configured to input the first voltage signal, a second input end of the comparison unit being configured to input the second voltage signal,

wherein, in a pre-charging stage of the work cycle, the first switch and the second switch are turned on to charge the capacitor, the first end of the capacitor and the second end of the capacitor are charged to the supply voltage and the common ground voltage, respectively;

wherein, in a comparing stage of the work cycle, the first switch and the second switch are turned off, the comparison unit compares the first voltage signal and the second voltage signal with the threshold voltage, respectively, and outputs the first oscillation signal and the second oscillation signal based on a result of the comparing.