Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2006-05-23
2006-05-23
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S558000, C375S376000, C375S327000
Reexamination Certificate
active
07049866
ABSTRACT:
Circuitry compensates for adverse effects resulting from leakage currents in loop filter capacitors for signal synthesizers, like PLLs. In one technique, leakage current in the loop filter's damping capacitor is compensated by driving the voltage across a matching capacitor and generating current for the damping capacitor based on current applied to the matching capacitor. In another technique, leakage current in the loop filter's transconductor capacitor is compensated by digitally accumulating differences between the damping capacitor voltage and a reference voltage, and then converting the accumulated difference into a (voltage or current) signal applied to the transconductor capacitor. In addition, the loop filter could have an analog transconductor path that generates a signal that is also applied to the transconductance capacitor. By effectively compensating for capacitor leakage currents, signal synthesizers of the present invention can be implemented using capacitors having thinner oxide gates, thereby reducing the size of the capacitors.
REFERENCES:
patent: 5659588 (1997-08-01), Fiedler
patent: 5942949 (1999-08-01), Wilson et al.
patent: 6016332 (2000-01-01), Smith et al.
patent: 6043715 (2000-03-01), Bailey et al.
patent: 6510033 (2003-01-01), Maloney et al.
patent: 6600351 (2003-07-01), Bisanti et al.
patent: 6826246 (2004-11-01), Brown et al.
patent: 6861898 (2005-03-01), Hsu et al.
patent: 2005/0035797 (2005-02-01), Frans et al.
“A CMOS Selft-Calibrating Frequency Synthesizer”, by William Wilson et al., IEEE Journal of Solid-State Circuits, vol. 35, No. 10, Oct. 2000, pp. 1437-1444.
Agere Systems Inc.
Le Dinh T.
LandOfFree
Compensating for leakage currents in loop filter capacitors... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compensating for leakage currents in loop filter capacitors..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compensating for leakage currents in loop filter capacitors... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3612082