Signal protection circuit based on level shifts

The utility model discloses a signal protection circuit based on level shifts, its characterized in that: including RC filter circuit, catching diode, biasing transistor circuit and bypass circuit, RC filter circuit is including the first resistance and the first electric capacity of establishing ties each other, and in this current circuit, first resistance one end is signal protection circuit input end, first electric capacity one end ground connection, and catching diode's input is connected to the common port of first resistance and first electric capacity, and biasing transistor circuit is connected to catching diode's output, and biasing transistor circuit's output is signal protection circuit output, the bypass circuit includes second electric capacity, and the output at biasing transistor circuit, other end ground connection are connected to the one end of second electric capacity. The utility model discloses can effectively reduce the signal receives and crosstalking. Through the test, can improve fr