Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Patent
1993-03-17
1995-08-01
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
327 5, 327 7, 327 12, H03K 526
Patent
active
054382858
ABSTRACT:
A phase/frequency comparator includes: two inputs which respectively receive first and second logic signals; a first logic gate which is at an active state during a duration equal to the phase advance of the first signal with respect to the second signal; and a second logic gate which is at an active state during a duration equal to the phase advance of said second signal with respect to the first signal. The phase/frequency comparator also includes: a first switching element operated by the active state of the second gate to prevent transmission to the first gate a state liable to switch the first gate to its active state; and a second switching element operated by the active state of the first gate to prevent transmission to the second gate a state liable to switch the second gate to its active state.
REFERENCES:
patent: 3626307 (1971-12-01), Koyama
patent: 3714463 (1973-01-01), Laune
patent: 4090143 (1978-05-01), Merrell
patent: 4281259 (1981-07-01), Ozawa
patent: 4322643 (1982-03-01), Preslar
patent: 4354124 (1983-10-01), Shima et al.
patent: 4451794 (1984-05-01), Yamada
patent: 4502014 (1985-02-01), Bismarck
patent: 4594563 (1986-06-01), Williams
patent: 4751469 (1988-06-01), Nakagawa
patent: 4777447 (1988-10-01), Mueller
patent: 4851784 (1989-07-01), Wells et al.
patent: 4904948 (1990-02-01), Asami
patent: 4928026 (1990-05-01), Ebesyu
patent: 5059833 (1991-10-01), Fujii
IEEE Journal of Solid-State Circuits, No. 2, 1987, New York, US, pp. 255-261, Deog-Kyoon Jeong, et al., "Design of PLL-Based Clock Generation Circuits".
Callahan Timothy P.
Lam T.
SGS-Thomson Microelectronics S.A.
LandOfFree
Phase/frequency comparator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phase/frequency comparator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase/frequency comparator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-735736