Patent ID: 7152009

Claim:
A parameter correction circuit, which is a built-in parameter correction circuit of a semiconductor integrated circuit, comprising: a current supply circuit; a variable parameter component; a plurality of switching circuits; a voltage measuring circuit; and an adjusting circuit that adjusts a parameter value of the variable parameter component, wherein the current supply circuit, the variable parameter component, the plurality of switching circuits, the voltage measuring circuit and the adjusting circuit are included in the semiconductor integrated circuit, any one of the switching circuits is connected to a reference parameter component having a preliminarily known parameter value, the switching circuits are allowed to switch electrical connections among the current supply circuit, the reference parameter component, the variable parameter component and the voltage measuring circuit, the voltage measuring circuit measures voltages generated in the reference parameter component and the variable parameter component respectively when current is respectively supplied to the reference parameter component and the variable parameter component from the current supply circuit, and the adjusting circuit adjusts the parameter value of the variable parameter component such that the voltage of the variable parameter component reaches the voltage of the reference parameter component.