Patent ID: 9167077
Filing Date: 2015-10-20
Classification: H02H,H04L,H04M

Abstract:
1. A surge protection circuit comprising: a first terminal coupled to a transmission path; a second terminal coupled to a PHY circuit to transfer a signal on a physical layer; a clamping unit coupled so as to branch from a first line between the first terminal and the second terminal, the clamping unit being configured to clamp a voltage applied to the first terminal to a clamping voltage; a first semiconductor switch that is disposed between the second terminal and a branching point at which the clamping unit branches from the first line, the first semiconductor switch being configured to have a rectification direction away from the second terminal toward the first terminal and a higher reverse breakdown voltage than the clamping voltage of the clamping unit; and a resistor, one end of the resistor being coupled to the first line between the clamping unit and the first semiconductor switch, and the other end of the resistor being coupled to a signal ground line.