Signal conversion circuit and fingerprint identification system

The invention provides a signal conversion circuit and a fingerprint identification system. The signal conversion circuit is used for generating a first digital signal according to a first analog signal. The signal conversion circuit comprises a comparator and a counter, wherein the comparator comprises a first input end for receiving the first analog signal, a second input end which is connected to a reference voltage generator and used for receiving a reference voltage, and an output end for outputting a second digital signal; and the counter is connected to the output end, and used for generating the first digital signal. The signal conversion circuit provided by the invention has the advantages of simple circuit structure, small circuit area, low cost and low power consumption.