Digital phase-frequency discriminator comprising simplified...

Details Digital phase-frequency discriminator comprising simplified... Digital phase-frequency discriminator comprising simplified...

H - Electricity

03

K

329/16

H03K 5/26 (2006.01) G01R 25/00 (2006.01) H03D 13/00 (2006.01)

Patent

CA 1274587

DIGITAL PHASE-FREQUENCY DISCRIMINATOR COMPRISING SIMPLIFIED RESET MEANS AND ASSOCIATED METHOD ABSTRACT OF THE DISCLOSURE The present invention provides a phase-frequency discriminator comprising a first RS latch coupled to provide first output signals, said first RS latch including an S input terminal coupled to receive first input signals; a second RS latch coupled to provide second output signals, said second RS latch including an S input terminal coupled to receive second input signals; a third RS latch including an S input terminal coupled to a ? output terminal of said first RS latch and including a ? output terminal coupled to an R input terminal of said first RS latch; a fourth RS latch including an S input terminal coupled to a ? output terminal of said second RS latch and including a ? output terminal coupled to an R input terminal of said second RS latch; and reset means for providing a reset signal when said first and second input signals both have changed from a first to a second logical state such that the first and second output signals change back from the second to the first logical state after a reset time interval substantially long enough for the respective first and second output signals to reach full logic amplitude levels for the second logical state.

522574

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