Patent ID: 6148050
Filing Date: 2000-11-14
Classification: G01R

Abstract:
A method of digitizing the phase of an input signal, said method comprising the steps of:generating a phase reference signal having a frequency substantially equal to a desired frequency of the input signal;computing a value representative of the phase of the input signal at a time when a sampling signal occurs, said computing step comprising the steps of:recording a first value (rs) of the phase reference signal in response to the occurrence of the sampling signal, and a second (r1) and third (r2) values of the phase reference signal in response to a first and a second zero crossing of the input signal respectively, the first and second zero crossings being nearest in time to the occurrence of the sampling signal;computing a ratio comprising the first value relative to the values of said second and said third values of the phase reference signal; andcomputing said value representative of the phase of the input signal responsive to said ratio.