Patent ID: 6807497
Filing Date: 2004-10-19
Classification: G01B

Abstract:
A method of computing phase difference between a measured signal and a reference signal, the method comprising:measuring a first cycle of the measured signal to arrive at a first denominator; measuring a first cycle of the reference signal to arrive at a second denominator; calculating a time after the first cycle of the measured signal and a subsequent pulse of a reference clock signal to arrive at a first numerator; calculating a time after the first cycle of the reference signal and the subsequent pulse of the reference clock signal to arrive at a second numerator; dividing the first numerator by the first denominator to arrive at a first quotient; dividing the second numerator by the second denominator to arrive at a second quotient; and deriving a difference between the first and second quotients to arrive at a first position value, wherein the position value translates to a first phase difference.