Current comparator circuit

The invention belongs to the technical field of circuits, and relates to a current comparator circuit which comprises a current-voltage conversion circuit, a pre-amplification circuit, a latch circuit and at least one set of gain adjustment circuit. The output end of the pre-amplification circuit is provided with a first control switch in parallel. The latch circuit is provided with a second control switch; and each group of gain adjusting circuit is provided with a third control switch. According to the comparison circuit, three working modes of an error pre-amplification circuit, a latch amplification circuit and a zero clearing circuit are realized by multiplexing devices and combining the working states of the first control switch, the second control switch and the third control switch, so that the area of the comparator is utilized to the maximum extent; by changing the number of the closed third control switches, the gain of the current comparator is adjusted so as to adapt to high-precision comparison