Integral comparator for weak voltage signal detection in semiconductor laser power control

The invention discloses an integral comparator for weak voltage signal detection in semiconductor laser power control. The integral comparator comprises a voltage and current conversion circuit and acharge integral comparator, the voltage and current conversion circuit comprises a transconductance amplifier and an error amplifier used for eliminating direct current offset of the transconductanceamplifier, three groups of clock circuits are controlled through four groups of switches, and the voltage and current conversion circuit is determined to have two working states of offset detection elimination and signal amplification. The charge integral comparator comprises an integrator and a voltage comparator, the voltage comparator works in two phases of an integral phase and a zero clearingphase, and the integral comparator is enabled to be in a continuous cycle of a zero clearing state and an integral comparison state under the control of a clock signal and a switch. According to theinvention, the voltage and c