Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2005-12-27
2005-12-27
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
06980049
ABSTRACT:
The invention relates to a Polyphase-Notchfilter for filtering input signals comprising known bandpass filters, which comprise voltage-controlled current sources. To provide an integrated circuit that has notch filter functionality with reduced circuit erogation, that allows high suppression with little matching effort and reduced power consumption it is proposed that at least two second voltage-controlled current sources are provided, that said at least four input means are coupled to said at least two second voltage-controlled current sources, and that said at least four output means are coupled to said at least two second voltage-controlled current sources, and that said at least one second voltage-controlled current sources are coupled antiparallel to bandpass filter.
REFERENCES:
patent: 4884036 (1989-11-01), Koyama et al.
patent: 5220686 (1993-06-01), Kasperkovitz et al.
patent: 6069522 (2000-05-01), Venkatraman et al.
patent: 6184748 (2001-02-01), Rao et al.
patent: 6429733 (2002-08-01), Pagliolo et al.
patent: 6512414 (2003-01-01), Yokoyama et al.
Cunningham Terry D.
Koninklijke Philips Electronics , N.V.
Ure Michael J.
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