PHASE FREQUENCY DETECTOR HAVING INSTANTANEOUS PHASE DIFFERENCE OUTPUT

Title:

PHASE FREQUENCY DETECTOR HAVING INSTANTANEOUS PHASE DIFFERENCE OUTPUT

Document Type and Number:

WIPO Patent Application WO1999057814

Kind Code:

A3

Abstract:

A phase frequency detector comprises means for providing Up/Down signals in order to detect a phase difference between detector input signals, and output control means having Up/Down signal inputs for providing a detector output signal containing a measure which is proportional to said detected phase difference, and having capacitor means for providing the detector output signal whose measure depends instantaneously on said detected phase difference. This allows a loop filter which is present in a phase locked loop to have reduced averaging properties and to have a broader bandwidth resulting in a cleaner output frequency signal of a voltage controlled oscillator in the phase locked loop.

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Inventors:

DELUIGI BRUNO J (NL)
LOCHER MATTHIAS (NL)

Application Number:

PCT/IB1999/000725

Publication Date:

March 09, 2000

Filing Date:

April 22, 1999

Export Citation:

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Assignee:

KONINKL PHILIPS ELECTRONICS NV (NL)
PHILIPS SVENSKA AB (SE)

International Classes:

H03L1/00; H03L7/089; H03D13/00; (IPC1-7): H03D13/00

Foreign References:

US5121010A	1992-06-09
US4801894A	1989-01-31
US4608538A	1986-08-26
US5604926A	1997-02-18
US5266907A	1993-11-30

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