Multichannel bipolar constant-current source circuit circuit with high-precision and low-temperature drift

The invention relates to a multichannel bipolar constant-current source circuit with high-precision and low-temperature drift, comprising a dynamic integration circuit, an operation amplifying circuit, a constant-current driving circuit, a sampling feedback circuit, an offset adjustment circuit, and an output protection circuit. As the dynamic integration circuit of the input stage, the non-inverting input terminal is connected to the external DAC input, the inverting input terminal is connected to the sampling feedback circuit, and the output terminal is connected to the operation amplifyingcircuit. The operation amplifying circuit converts the obtained voltage signal into a current signal, and sends it to the constant-current driving circuit as an output stage for current amplification,then sends one way to the sampling feedback circuit, and outputs the other way through the output protection circuit to an external connector. The bias adjustment circuit is connected to the non-inverting input terminal of th