Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2006-08-29
2006-08-29
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000
Reexamination Certificate
active
07098730
ABSTRACT:
Continuous time filters and Δ-Σ analog to digital converters and methods for process variation trim/tuning. In feed forward filters, the resistance of feed forward transconductance elements are adjusted to compensate for process variation in the GM/SC values in the filters. Since all. GM/SC values are subject to the same RC process variation, and the resistance in all feed forward transconductance elements is also subject to the same R process variation, the resistance in the feed forward transconductance elements may be adjusted in accordance with analytically predetermined factors based on a single measurement of the RC process variation for each filter to compensate for the overall RC process variation. Various embodiments are disclosed, both as feed forward filters and as Δ-Σ analog to digital converter systems using such filters.
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Blakely , Sokoloff, Taylor & Zafman LLP
Cunningham Terry D.
Hiltunen Thomas J.
Maxim Integrated Products Inc.
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