Circuit for reading multichannel signals, photon counting system and chip module

The embodiment of the invention provides a circuit for reading multi-channel signals, a photon counting system and a chip module, the circuit for reading the multi-channel signals comprises a circuit array, the circuit array comprises a plurality of signal reading circuits, and each signal reading circuit in the plurality of signal reading circuits is used for reading signals of one channel; the first silicon through hole is used for being connected with an external power supply so as to introduce a first voltage; a second through silicon via for connecting an external ground to introduce a second voltage; the band-gap reference source is used for receiving the first voltage and the second voltage to generate reference voltage, and the difference value between the reference voltage and the second voltage is kept unchanged; and the low dropout regulator is used for generating a third voltage according to the reference voltage and the second voltage, the difference value between the third voltage and the second