Patent ID: 7664621
Filing Date: 2010-02-16
Classification: G01R,H03M

Abstract:
1. A method for mapping system transfer functions comprising: receiving a first intermediate signal at a comparator that is at least partially based upon a first reference signal from a first reference signal generator; receiving a second intermediate signal at the comparator that is at least partially based upon a second reference signal from a second reference signal generator; generating an output signal at the comparator that is based upon the difference between the first intermediate signal and the second intermediate signal; determining, at a processor, a first anticipated differential change in the output signal, the first anticipated differential change to occur based upon a transition in the first reference signal; determining, at the processor, a second anticipated differential change in the output signal, the second anticipated differential change to occur based upon a transition in the second reference signal; measuring, at the processor, a first realized differential change in the output signal, the first realized differential change occurring based upon a transition in the first reference signal; measuring, at the processor, a second realized differential change in the output signal, the second realized differential change occurring based upon a transition in the second reference signal; comparing, at the processor, the first realized differential change in the output signal to the first anticipated differential change in the output signal to determine a first nonlinearity indicator; and comparing, at the processor, the second realized differential change in the output signal to the second anticipated differential change in the output signal to determine a second nonlinearity indicator.