Patent ID: 6662126
Filing Date: 2003-12-09
Classification: G01R

Abstract:
A method for measuring skew of an on-chip signal on a computer chip, comprising:distributing an externally generated reference signal to the computer chip; inputting the externally generated reference signal and the on-chip signal to a first on-chip sampler, wherein the first on-chip sampler is disposed on a first portion of the computer chip; inputting the externally generated reference signal and the on-chip signal to a second on-chip sampler, wherein the second on-chip sampler is disposed on a second portion of the computer chip; selectively modulating the externally generated reference signal to determine at least one transition of the on-chip signal at the first portion and the second portion; and determining skew of the on-chip signal between the first portion and the second portion dependent upon an output from the first on-chip sampler and an output from the second on-chip sampler.