Trimming circuit of differential amplifier

A trimming circuit of differential amplifier, wherein,

• an output terminal of the differential amplifier is coupled to a first input terminal of the differential amplifier through a first voltage-dividing resistor;
• a shift voltage is coupled to a second input terminal of the differential amplifier through a second voltage-dividing resistor;
• the first voltage-dividing resistor and the second voltage-dividing resistor are respectively formed to be a T-shaped resistor network structure;
• the T-shaped resistor network structure comprises:
• a k-bit resistive network coupled to a T-shaped node and a reference power supply terminal, wherein a low n-bits of the k-bit resistive network is a R-2R resistive network, and part of branches of the low n-bits are connected in series with at least one trimming resistor, and each trimming resistor is connected in parallel with a switch, wherein k and n are positive integers greater than or equal to 1, and k≥n.