Patent ID: 7049986

Claim:
A method of trimming a parameter of an integrated circuit including first and second conductors each of which can be incrementally adjusted to accomplish trimming of the parameter, the integrated circuit also including a first trim array including a plurality of weighted trim elements each having a corresponding bit number and each coupled to a corresponding interruptible link which determines whether that trim element is operatively coupled to the first conductor and a second trim array including a plurality of weighted trim elements each having the same bit number as a weighted trim element of the first trim array and each coupled to a corresponding interruptible link which determines whether that trim element is operatively coupled to the second conductor, the method comprising: (a) measuring an initial value of the parameter; (b) determining whether the parameter has a first relationship to a predetermined reference value; (c) as long as the parameter has the first relationship to the predetermined reference value, repetitively interrupting a link of the first trim array having a bit number and decrementing the bit number to change the parameter in a first direction by weighted amounts corresponding to the bit number values until either all links of the first trim array have been interrupted or links of the first trim array have been interrupted to cause the parameter to become less than a first accuracy value; (d) interrupting an interruptible link of the second trim array corresponding to the present bit number if step (c) determines that the present value of the parameter has the first relationship to the predetermined accuracy value; and (e) if in step (d) all of the all links in the first trim array have not yet been interrupted, decrementing the bit number and repeating steps (b), (c), (d), and (e) until all of the all links of the first trim array have been interrupted.