Current self-checking regulation circuit based on voltage calibration

A current self-checking regulation circuit based on voltage calibration, comprising a bandgap reference unit, a self-calibration unit, a detection and regulation unit, current mirror units, and a current mirror control unit, wherein the number of the current mirror units is at least two, one of the current mirror units is a reference group current mirror unit, the rest of the current mirror units is at least one regulation group current mirror unit, the detection and regulation unit is coupled with the bandgap reference unit, the reference group current mirror unit, the regulation group current mirror unit, and the current mirror control unit, the bandgap reference unit is coupled with the self-calibration unit, the reference group current mirror unit is coupled with the self-calibration unit, the regulation group current mirror unit is coupled with the current mirror control unit, the current mirror control unit is coupled with a laser driver, and the detection and regulation unit is coupled with the reference group current mirror unit, the regulation group current mirror unit, the current mirror control unit, and the self-calibration unit;

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• the bandgap reference unit is configured to generate a voltage signal, the self-calibration unit is configured to respond to a digital signal of the detection and regulation unit and calibrate the voltage signal of the bandgap reference unit to generate a calibrating voltage signal, the reference group current mirror unit generates a reference current signal according to the calibrating voltage signal, the detection and regulation unit samples the reference current signal and a mirror current signal of the regulation group current mirror unit and generate a digital control signal according to the reference current signal and the mirror current signal of the regulation group current mirror unit, and the current mirror control unit responds to the digital control signal and outputs a regulated bias current signal meeting needs of the laser driver.