Phase detector and methodology

Details Phase detector and methodology Phase detector and methodology

1992-12-30

1994-12-27

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 3, 327 24, H03K 906, G01R 2500

Patent

active

053768477

ABSTRACT:
In one embodiment, a method of providing phase detection from a circuit having first and second inputs and at least one output is disclosed. The method includes a cyclical operation of four steps. The first step awaits the receipt at the first input of an input signal which at least meets the requirements of one of two given binary values. The second step awaits the receipt at the first input of an input signal which at least meets the requirements of the other of the two given binary values before providing an output signal of a first value at the output. The third step awaits the receipt at the second input of an input signal which at least meets the requirements of one of two given binary values. The fourth step awaits the receipt at the second input of an input signal which at least meets the requirements of the other of the two given binary values before changing the output signal at the output to a second value. The process then returns to the first step. Apparatus in accordance with the inventive method are also described, including preferred TTL and CMOS logic diagrams for implementing a four state machine.

REFERENCES:
patent: 4237423 (1980-12-01), Rhodes
patent: 4354124 (1982-10-01), Shima et al.
patent: 4451794 (1984-05-01), Yamada
patent: 4851784 (1989-07-01), Wells et al.
patent: 5059833 (1991-10-01), Fujii
patent: 5124594 (1992-06-01), Nuwata et al.

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