An active shielding detecting circuit wirings

The present invention relates to a detection circuit of an active shield wiring, belonging to the technical field of detection safety protection chip; the circuit comprises a first amplifier stage, a stored value circuit, a second stage amplifier, A / D converter, the CPU controller, a written in the memory and a comparator; a first amplifier by a first amplifier stage, a plurality of switches and a plurality of shield lines are detected the composition; an output terminal of a termination circuit stored value of the first stage amplifier, the other end of the second stage amplifier the positive input terminal; output of a / D input terminal of the second stage amplifier; a / D input terminal and the output terminal of the comparator is connected; the CPU and with the first stage amplifier connected to the memory write-once, write once memory and a comparator connected to the CPU; input of the comparator are connected to the write once memory and an output terminal of a / D output. The present invention can be reduced, and the influence of process variation mismatch circuit temperature, thereby improving the accuracy of the detection circuit.