Patent ID: 7630846
Filing Date: 2009-12-08
Classification: G01R

Abstract:
1. A method of testing a phase detector comprising: if an output of a first phase detector and a second phase detector are at an initial converged counter position comprising a +0 counter position; storing output from the first phase detector and from the second phase detector; increasing a counter to reach a +1 counter position comprising 1 counter position above the initial converged counter position, and storing output from the first phase detector and from the second phase detector; decreasing a counter to reach a −1 counter position comprising 1 counter position below the initial converged counter position, and storing output from the first phase detector and from the second phase detector; and comparing output from the first phase detector and from the second phase detector at the initial converged counter position, at the −1 counter position, and at the +1 counter position.