Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1998-12-16
2000-10-10
Chin, Stephen
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
375374, 455260, 329325, 332127, H03D 324
Patent
active
061309257
ABSTRACT:
The purpose of the present invention is to provide a frequency synthesizer which does not have spurious components. Automatic reference correcting circuit 4 is provided to frequency synthesizer 1 which changes the frequency division value of the divider and makes the frequency of external output signal (OUT) into a value equal to the frequency of the reference clock signal multiplied by the average frequency division value, charge pump circuit 35 measures the ripple component contained in the output control signal, and ripple correcting circuit 39 forms compensation current, which is superimposed on the control signal in order to minimize the ripple component. If composed for control circuit 55 to obtain the optimum compensation current and output to ripple correcting circuit 39 while negative feedback which minimizes the ripple component is being formed, output signal (OUT) which does not have spurious components can be obtained.
REFERENCES:
patent: 5180993 (1993-01-01), Dent
patent: 5692023 (1997-11-01), Clark
patent: 5701598 (1997-12-01), Atkinson
patent: 5834987 (1998-11-01), Dent
Ichimaru Kouzou
Kawahara Yohichi
Chin Stephen
Jiang Lenny
Kempler William B.
Telecky Jr. Frederick J.
Texas Instruments Incorporated
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