Phase detector circuit for periodic signal using three...

Details Phase detector circuit for periodic signal using three... Phase detector circuit for periodic signal using three...

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01

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328/162, 324/33

G01R 25/00 (2006.01) H03D 13/00 (2006.01) H03L 7/081 (2006.01) H03L 7/091 (2006.01) H04N 9/89 (2006.01) H04N 9/896 (2006.01) H04L 7/033 (2006.01)

Patent

CA 1305519

Abstract of the Disclosure A phase detection circuit for detecting the phase shift of an input signal. An A/D converter converts the input signal into first, second and third digital data according to successive three sampling points. A first subtracter subtracts the third data from the second data to produce a first subtraction signal. A second subtracter subtracts the first data from the second data to produce a second subtraction signal. A third subtracter subtracts the second subtraction signal from the first subtraction signal to produce a signal representing the phase shift. An adder adds the first and second subtraction signals together to produce a signal representing the amplitude of the input signal. A converter converts the signal representing the phase shift into a signal representing the absolute value of the phase shift according to the signals representing the phase shift and the amplitude.

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