The invention relates to an active and
passive imaging readout circuit working at a linear mode APD (Avalanche Photo
Diode) array, which is provided with a
detector, a
short circuit protection circuit, an integral circuit, an integral
time control circuit, an active and passive
mode switching circuit, a sampling retaining circuit and a row selection circuit, wherein an output end of the
detector is connected with an input end of the
short circuit protection circuit, an output end of the
short circuit protection circuit is connected with an input end of the integral circuit, an output end of the integral
time control circuit is connected with an input end of the active and passive
mode switching circuit, one output end of the active and passive
mode switching circuit is connected with a
control signal end of the integral circuit, the other output end of the active and passive mode switching circuit is connected with a
control signal end of the sampling retaining circuit, an output end of the integral circuit is connected with an input end of the sampling retaining circuit, an output end of the sampling retaining circuit is connected with an input end of the row selection circuit, and an output end of the row selection circuit is connected with a follow-up
signal processing circuit.