Patent ID: 6462609
Filing Date: 2002-10-08
Classification: H03M

Abstract:
A trimming circuit comprising:a resistor connected to either one of a first power supply and a second power supply; at least one trimming element connected between the other one of the first power supply and the second power supply, and the resistor; at least one resistance bypass circuit, connected to a node between the resistor and the at least one trimming element, for selectively performing ordinary breakage and hypothetical breakage of the trimming element in accordance with a control signal and a data signal, wherein the at least one resistance bypass circuit holds the at least one trimming element in an unbroken state in accordance with the control signal during the hypothetical breakage, and wherein the at least one resistance bypass circuit connects the at least one trimming element to the first power supply and the second power supply in accordance with the control signal and the data signal and breaks the trimming element during the ordinary breakage; and an output changeover circuit, connected to the node, for generating a first output signal in accordance with a state of the at least one trimming element during the ordinary breakage, and for generating a second output signal in accordance with the data signal during the hypothetical breakage.