Pixel circuit

A pixel circuit, comprising:

• a photodiode, configured to accumulate charges in response to incident radiation, to generate a photodiode signal;
• a buffer circuit, configured to output at least one read-out signal, wherein an input terminal of the buffer circuit is coupled to a specific node;
• a first capacitor, coupled between a control voltage terminal of the pixel circuit and the specific node;
• a first switch, coupled between the photodiode and the specific node;
• a second switch, coupled between the input terminal of the buffer circuit and an output terminal of the buffer circuit;
• and
• a third switch, coupled between the output terminal of the buffer circuit and a read-out terminal of the pixel circuit;
• wherein a voltage level of the specific node is set to a reset level during a reset phase, the photodiode signal is transmitted to the specific node during a transfer phase after the reset phase, and the buffer circuit outputs said at least one read-out signal to the read-out terminal during a read-out phase after the transfer phase;
• wherein a voltage level of the control voltage terminal is pulled up from a first reference level to a second reference level before the first switch is turned on to start transmitting the photodiode signal to the specific node, and the voltage level of the control voltage terminal is pulled down from the second reference level to the first reference level before the buffer circuit outputs said at least one read-out signal to the read-out terminal.