Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2005-12-27
2005-12-27
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S156000
Reexamination Certificate
active
06980038
ABSTRACT:
The present invention provides for a phased locked loop. A capacitor has an associated leakage current. A differential circuit is coupled to the capacitor of a low pass filter. A voltage follower circuit is coupled to the output of the differential circuit. The gate of a field effect transistor (FET) is coupled to an output of the voltage follower circuit. A current mirror is coupled to the FET, the current mirror having a first source and a second source, wherein the second current mirror source is coupled to the drain of the FET, wherein an output of the first current mirror source is coupled to the capacitor. Through the employment of current mirror source, leakage charge within the capacitor is replaced.
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Boerstler David William
Hailu Eskinder
Carr LLP
Gerhardt Diana R.
International Business Machines - Corporation
Le Dinh T.
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