Global shutter cmos pixel circuit and image capturing method thereof

A global shutter CMOS pixel circuit, comprising:

• a power supply unit, a pixel signal generating unit, a signal sampling and holding unit and a signal outputting unit;
• wherein the power supply unit is connected to the pixel signal generating unit, the signal sampling and holding unit, and the signal outputting unit;
• an output of the pixel signal generating unit is connected to an input of the signal sampling and holding unit;
• an output of the signal sampling and holding unit is connected to an input of the signal outputting unit;
• the pixel signal generating unit comprises:
• a first current source, a second current source, a first control terminal, a second control terminal, a bias voltage terminal, a column selection terminal, a photodiode, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, wherein, the drain of the first transistor is connected to the positive electrode of the power supply unit, the gate of the first transistor is connected to the bias voltage terminal;
• the source of the first transistor is connected to the drain of the second transistor, the drain of the third transistor, the source of the fourth transistor at a node;
• the source of the second transistor is connected to cathode of the photodiode, the gate of the second transistor is connected to the column selection terminal;
• the anode of the photodiode is connected to the negative electrode of the power supply unit;
• the source of the third transistor is connected to the positive electrode of the first current source, the gate of the third transistor is connected to the first control terminal;
• the other electrode of the first current source is connected to the negative electrode of the power supply unit;
• the drain of the fourth transistor is connected to the gate of the fifth transistor, the gate of the fourth transistor is connected to the second control terminal;
• the drain of the fifth transistor is connected to the positive electrode of the power supply unit, the source of the fifth transistor is connected to the positive electrode of the second current source and is the output of the pixel signal generating unit;
• the other electrode of the second current source is connected to the negative electrode of the power supply unit.