Patent ID: 7965065

Claim:
A trimming circuit which trims a supplied external voltage to supply a trimmed voltage via a supply line, comprising: a differential amplifier having a reference voltage inputted to one input terminal thereof and generating said trimmed voltage from said external voltage to output onto said supply line; a series resistor circuit having a plurality of trimming resistors connected serially via a plurality of connection points, the plurality of trimming resistors being provided between said supply line and ground potential; a plurality of ON/OFF switches provided respectively in between said connection points and another input terminal of said differential amplifier; and a shunt circuit having a shunt series resistor circuit of two shunt resistors serially connected via a middle point and two shunt ON/OFF switches respectively connected to opposite ends of said shunt series resistor circuit, said shunt circuit being connected in parallel with said series resistor circuit, wherein said middle point is connected to one of said connection points of said series resistor circuit, the resistance ratio thereof with respect to said one of said connection points being equal to the resistance ratio of said shunt resistors.