Integrated circuit

Abstract

An integrated circuit including an input protection circuit cell, that comprises an input terminal coupled to a signal pin; an output terminal coupled to not only a high-frequency circuit but also the input terminal and a node; a diode provided between the node and VDD and making an electric current flow from the node to VDD; another diode provided between the node and GND and making an electric current flow from GND to the node; and a clamp circuit coupled between VDD and GND parallel to the diodes.

1 - 5 . (canceled) 
     
     
         6 . A circuit comprising:
 a signal pin;   an internal circuit including a high-frequency circuit; and   an input protection circuit cell that is placed between the signal pin and the internal circuit and performs a protection operation when a signal at the signal pin is applied to the high-frequency circuit,   wherein the input protection circuit cell includes:   an input terminal coupled to the signal pin;   an output terminal that is coupled to the high-frequency circuit and to the input terminal via a coupling node;   a first diode that is provided between the coupling node and a high-voltage power supply and makes an electric current flow from the coupling node to the high-voltage power supply;   a second diode that is provided between the coupling node and a low-voltage power supply and makes an electric current flow from the low-voltage power supply to the coupling node; and   a clamp circuit that is coupled parallel to the first and second diodes between the high-voltage power supply and the low-voltage power supply.