Low-pass filter and phase locked loop

Details Low-pass filter and phase locked loop Low-pass filter and phase locked loop

2008-01-15

2008-01-15

Kim, Kevin (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

Reexamination Certificate

active

07319732

ABSTRACT:
The loop filter in the PLL includes: a filter circuit (first partial circuit) including a capacitive element, one end of the first partial circuit being connected to an output terminal of a charge pump circuit, a voltage for controlling a voltage-controlled oscillator being output from the other end of the first partial circuit; a voltage buffer circuit to which a voltage at a predetermined node in the filter circuit is input; and a filter circuit (second partial circuit), one end of the second partial circuit being connected to the output terminal of the charge pump circuit, the other end being connected to an output terminal of the voltage buffer circuit.

REFERENCES:
patent: 6344772 (2002-02-01), Larsson
patent: 6437615 (2002-08-01), Stascausky
patent: 6476681 (2002-11-01), Kirkpatrick
patent: 6546059 (2003-04-01), Knoll et al.
patent: 2778421 (1998-05-01), None
patent: WO 03/098807 (2003-11-01), None

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