Patent ID: 7555829

Claim:
A method for adjusting an output parameter of a circuit, the method comprising: (a) providing in said circuit a plurality of components including at least one thermally trimmable resistor and at least one other component, said thermally trimmable resistor possessing a hysteresis characteristic with respect to a dependence of a temperature coefficient on a resistance, and positioning said at least one thermally trimmable resistor in said circuit such that said output parameter is affected by variations of parameters of said at least one thermally trimmable resistor; (b) trimming a resistance value and a temperature coefficient of resistance of said at least one thermally trimmable resistor to independent values to cause a change in said output parameter, said trimming said temperature coefficient of resistance done by cycling said resistance value in a first direction away from a starting point and in a second direction back towards said starting point, thereby using said hysteresis characteristic of said thermally trimmable resistor; and (c) measuring said output parameter.