Integrated circuit arrangement comprising an active filter...

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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Reexamination Certificate

active

06838929

ABSTRACT:
The invention relates to an integrated circuit arrangement with an active filter comprising transconductance stages, each being adjustable by means of a bias current to be supplied, and comprising a tuning device for tuning the filter, which tuning device adjusts the bias currents of the transconductance stages, wherein the tuning device adjusts the bias current of a first transconductance stage, for the purpose of achieving a desired characteristic of this transconductance stage, and adjusts the bias current of at least one further transconductance stage such that the transconductance of this further transconductance stage deviates from the transconductance of the first transconductance stage by a certain value.

REFERENCES:
patent: 5617052 (1997-04-01), Kimura
patent: 5621358 (1997-04-01), Pisati et al.
patent: 6140867 (2000-10-01), de Micheli et al.
patent: 6172569 (2001-01-01), McCall et al.
patent: 6512414 (2003-01-01), Yokoyama et al.
patent: 6538498 (2003-03-01), Lee et al.
patent: 694 27 471 (2002-04-01), None
Silva-Martinez Jose et al., “High-Performance CMOS Continuous-Time Filters”, Kluwer Academic Publishers, The Kluwer International Series In Engineering and Computer Science, May 1993, ISBN 0-7923-9339-2, pp. 122-127.

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