Patent ID: 7973552

Claim:
An integrated circuit comprising: a semiconductor substrate; a first node; a second node; a first plurality of resistors, each in a first plurality of resistor units, wherein each of the first plurality of resistor units comprises a first end connected to the first node, and a second end connected to the second node, and wherein none of the first plurality of resistor units comprises a switch; a second plurality of resistors, each in a second plurality of resistor units, wherein each of the second plurality of resistor units comprises a first end connected to the first node, and a second end connected to the second node, and wherein the first plurality of resistors is formed of a first material, and the second plurality of resistors is formed of a second material different from the first material; and a switch in each of the second plurality of resistor units and serially connected to a resistor in a same resistor unit.