Phase detector circuit for periodic signal using three sampling

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

1989-02-23

1990-08-28

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Counting or dividing in incremental steps

Beam type tube

328 55, 328155, 328109, 377 43, 377 49, 307514, H03L 700, G01R 2504

Patent

active

049528831

ABSTRACT:
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 subtractor subtracts the third data from the second data to produce a first subtraction signal. A second subtractor subtracts the first data from the second data to produce a second subtraction signal. A third subtractor 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.

REFERENCES:
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patent: 4404583 (1983-09-01), Tatami
patent: 4617679 (1986-10-01), Brooks
patent: 4675724 (1987-06-01), Wagner
patent: 4751565 (1988-06-01), Emmons et al.
patent: 4763342 (1988-08-01), Ambrosio et al.

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