| 摘要 |
PURPOSE: A method for detecting a phase and a phase detector is provided to measure phase differences between signals A and B using an absolute voltage value for each phase difference between +/-180 degree. CONSTITUTION: A phase detector(30) comprises splitter(or directional coupler)(32), phase shifters(34,38), an attenuator(36), a summer(40), amplitude limiters(42,44) and a mixer(46). Signals Sa and Sb are provided as inputs to splitter(32) and phase adjuster(38), respectively. The signal Sa is a 1.999 GHz signal and Sb is a 2.000 GHz signal. A third signal C, which is a signal having a phase approximately equal to the average phase between signals A and B. Signals C and A are subsequently amplitude limited and mixed to produce a fourth signal D, which is a signal having associated an absolute voltage value for each degree of phase difference between +/-180 degree for signals A and B.
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