Loop filter, phase-locked loop, and method of operating the...

Details Loop filter, phase-locked loop, and method of operating the... Loop filter, phase-locked loop, and method of operating the...

2011-04-19

2011-04-19

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S156000, C327S158000, C327S161000, C327S172000

Reexamination Certificate

active

07928785

ABSTRACT:
A loop filter capable of controlling a charge sharing point in time, a phase locked loop, and a method of operating the loop filter are provided. The loop filter includes a duty control unit and a variable capacitor unit. The duty control unit generates a duty control clock signal of which an activation section is shorter than an inactivation section, by controlling a duty of an input clock signal. The variable capacitor unit is charged by an input current and has a capacitance that varies according to the duty control clock signal. The variable capacitor unit may include a switch, a first capacitor, and a second capacitor. The switch is turned on or off in response to the duty control clock signal. The first capacitor is serially connected to the switch and charged by the input current when the switch is turned on. The second capacitor is connected in parallel to the switch and the first capacitor and charged by the input current.

REFERENCES:
patent: 5675291 (1997-10-01), Sudjian
patent: 6420917 (2002-07-01), Klemmer
patent: 6433596 (2002-08-01), Bossard
patent: 6504437 (2003-01-01), Nelson et al.
patent: 10-107622 (1998-04-01), None
patent: 2002-050962 (2002-02-01), None
patent: 2006-129399 (2006-05-01), None
patent: 10-2000-0041072 (2000-07-01), None
patent: 10-2001-0111155 (2001-12-01), None
patent: 10-2002-0066925 (2002-08-01), None
patent: 10-2005-0007821 (2005-01-01), None
patent: 10-2006-0093540 (2006-08-01), None

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