Patent ID: 8710902

Claim:
A trimming circuit for trimming a resistor circuit, the resistor circuit including a plurality of resistors connected in series between a power supply terminal and a ground terminal, the trimming circuit comprising: an input terminal connected in common to a pad that comprises an external terminal of an internal circuit; an output terminal connected to the resistor circuit; a fuse directly connected to the output terminal and connected in parallel to a selected resistor of the plurality of resistors of the resistor circuit, the fuse and the selected resistor directly connected to either the power supply terminal or to the ground terminal; and a reverse biased diode directly connected to the input terminal and to the fuse, wherein the trimming circuit trims the resistor circuit by applying a voltage to the pad, such that a current flows from the pad to the power supply terminal or to the ground terminal only via the fuse and the reverse biased diode is biased in a forward direction.