Inbuilt miicromicro farad stage capacitance intermittent microcurrent second-level time delay circuit

The invention discloses an inbuilt miicromicro farad stage capacitance intermittent microcurrent second-level time delay circuit, which is provided with a mirror image current source, a switching tube, a capacitance charging circuit, a burst pulse generating circuit and an output circuit, wherein the output end of the mirror image current source and the output end of the burst pulse generating circuit are respectively connected with two input ends of the switching tube; the output end of the switching tube is connected with the input end of the capacitance charging circuit; the output end of the capacitance charging circuit is connected with the input end of the output circuit; and the output end of the output circuit is connected with a subsequent signal processing circuit. When a mirror image source produces microcurrent to charge the capacitance by the switching tube, a burst pulse signal controls the switching on and off of the switching tube to realize the intermittent charging to the capacitance by the