Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1996-04-16
1998-03-24
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327 94, 327552, 330107, H03K 500, H03B 100
Patent
active
057317372
ABSTRACT:
A method and apparatus for reducing reference frequency signal and/or clock switching noise in self-tuned integrated continuous-time filters. In the master-slave automatic tuning scheme, one or more sample-and-hold circuits sample and hold the frequency control signal and Q-control signal generated by the feedback loop(s) of the automatic tuning system. The control signals are held at a constant level for a period of time during which the reference frequency signal and/or clock signal are quiescent. At one or more predetermined times, the frequency control and Q-control signals are intermittently updated to automatically tune the slave filter.
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The Problem of On-Chip Automatic Tuning in Continuous-Time Integrated Filters, Schaumann & Tan, IEEE Proc. ISCAS, pp. 106-109, 1989.
Cranford, Jr. Hayden Clay
Huss Scott David
Callahan Timothy P.
International Business Machines - Corporation
Kordzik Kelly K.
Le Dinh T.
Phillips Steven B.
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