Threshold variable feedback circuit,consumable chip, and consumable

A threshold variable feedback circuit, characterized by comprising:

• a control unit;
• a feedback module, comprising four different feedback units that are connected between an output terminal and ground in parallel;
• wherein each feedback unit comprises plurality of transistors coupled in series;
• wherein each one of the feedback units comprises a gating component and a feedback component that are connected in series between the output terminal and the ground;
• the control unit is electrically connected with the gating component of each one of the feedback units such that the feedback module selects and outputs an electrical signal of one of the feedback units to the output terminal;
• wherein the feedback component of a first feedback unit is a first feedback transistor, and when the first feedback unit is selected, voltage of a drain of the first feedback transistor is output;
• wherein the feedback component of a second feedback unit is a second feedback transistor, and when the second feedback unit is selected, voltage of a drain of the second feedback transistor is output;
• wherein the feedback component of a third feedback unit is comprised of a third feedback transistor and a DC power supply that are connected in series, and when the third feedback unit is selected, the sum of voltage of a drain of the third feedback transistor and voltage of the DC power supply is output;
• wherein the feedback component of a fourth feedback unit is a fourth feedback transistor, and a grid of the fourth feedback transistor is grounded such that current in the fourth feedback unit is 0 when the fourth feedback unit is selected;
• and the width-to-length ratio of the first feedback transistor is different from that of the second feedback transistor.