Low-pass filter circuit

A low-pass filter circuit, comprising:

• a low-pass filter, coupled between an input terminal of the low-pass filter circuit and an output terminal of the low-pass filter circuit, configured to receive an input voltage signal through the input terminal during a first period, performing a low-pass filter operation on the input voltage signal to generate a filtered voltage signal, and providing the filtered voltage signal to the output terminal;
• and
• a discharging circuit, coupled between the output terminal and a reference low voltage, configured to receive the input voltage signal during the first period, and suppressing a leakage current flowing between the output terminal and the reference low voltage according to the input voltage signal and a reset signal,
• wherein the discharging circuit comprises:
• a first discharging switch, wherein a first terminal of the first discharging switch is coupled to the output terminal, a second terminal of the first discharging switch is coupled to a connection node, and a control terminal of the first discharging switch is configured to receive the reset signal;
• and
• a second discharging switch, wherein a first terminal of the second discharging switch is coupled to the second terminal of the first discharging switch, a second terminal of the second discharging switch is coupled to the reference low voltage, and a control terminal of the second discharging switch is configured to receive the reset signal,
• wherein during the first period:
• supply of the reset signal is stopped, such that both the first discharging switch and the second discharging switch are turned off, and
• the input voltage signal is provided to the connection node, such that a voltage value of the connection node is pulled up in response to the input voltage signal.