VOLTAGE LIMITING CIRCUIT FOR INTEGRATED CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a voltage limiting circuit for an integrated circuit capable of expecting a stable operation without adjustment even when a threshold voltage of a transistor fluctuates. SOLUTION: At the time of protecting a circuit block A, a first transistor 3 is interposed between signal input 1 and the circuit block A and a second transistor 5 similar to the first transistor 3 is interposed to a bias voltage generation circuit 4 for forming a bias voltage to be applied to the first transistor 3. Even when the threshold voltage of the first transistor 3 fluctuates, a threshold voltage of the second transistor 5 fluctuates and the bias voltage Vg applied from the bias voltage generation circuit 4 to the first transistor 3 is also compensated.