Symmetrical phase-frequency detector

Details Symmetrical phase-frequency detector Symmetrical phase-frequency detector

1996-10-28

1998-10-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

H03D 1300

Patent

active

058252100

ABSTRACT:
A phase-frequency detector for a phase-locked loop (PLL) circuit has symmetrical phase detection characteristics and produces symmetrical activation times on the "up" and "down" outputs for connection to a PLL charge pump circuit. The symmetrical characteristics are accomplished by using RS latch circuits at the outputs of the phase-frequency detector to provide the same loads and the same propagation delay for both the "up" and the "down" outputs. In addition, cross-wired sequential gates are used for at least some of the gates in the logic gate array of the detector to produce the same propagation delays in the gates.

REFERENCES:
patent: 4277754 (1981-07-01), Minakuchi
patent: 4751469 (1988-06-01), Nakagawa et al.
patent: 4928026 (1990-05-01), Ebesyu
patent: 5059833 (1991-10-01), Fujii
patent: 5420544 (1995-05-01), Ishibashi

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