ELECTROSTATIC DISCHARGE PROTECTION CIRCUIT USING DIODE

摘要

PURPOSE: An electrostatic discharge protection circuit using a diode is provided to perform only a forward operation for generating low power by using the diode. CONSTITUTION: A protection circuit(200) is used for protecting a circuit element(220) from electrostatic discharge stress of a pad input terminal(210). The protection circuit(200) is formed with the first and the second diode protection circuit portions(201,202). The first diode protection circuit portion(201) is arranged between the pad input terminal(210) and an input voltage terminal(VDD). The second diode protection circuit portion(202) is arranged between the pad input terminal(210) and a substrate terminal(VSS). The input voltage terminal(VDD) is used for applying bias to a high density drain region of a field effect transistor. The substrate terminal(VSS) is connected with a semiconductor substrate including the protection circuit(200) and the circuit element(220).