Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2007-11-27
2007-11-27
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S536000, C327S537000, C327S390000, C307S110000, C363S059000
Reexamination Certificate
active
11279446
ABSTRACT:
A delay looked loop (DLL) having a charge pump gain independent of the operating frequency of the DLL. A charge pump is disclosed for providing a charge to a capacitive element on a voltage controlled delay line, wherein the charge is independent of a control voltage step cycle time of the DLL, the charge pump includes: a charge/dump signal generation stage that generates a charge signal and a dump signal during each period of a reference clock signal; a first switched capacitor stage that charges a first capacitor in response to the charge signal and dumps a positive charge from the first capacitor in response to the dump signal; a second switched capacitor stage that charges a second capacitor in response to the charge signal and dumps a negative charge from the second capacitor in response to the dump signal; and an output stage that selectively loads either the positive charge or the negative charge to the capacitive element on the voltage controlled delay line in response to an input signal from a phase detector.
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Harding W. Riyon
Hoffman Warnick & D'Alessandro LLC
Luu An T.
Wells Kenneth B.
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