Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2000-12-21
2002-02-12
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C455S313000
Reexamination Certificate
active
06346850
ABSTRACT:
The present invention relates in general to a polyphase bandpass filter.
Such filters are known per se, for instance from the U.S. Pat. No. 4,914,408, and they can for instance be applied in receiver circuits for, e.g. radio applications, television applications, or telephone applications. Although such filters also know different applications, a possible application of such a filter will be explained here in more detail in the context of a receiver circuit.
An important drawback of the filter described in U.S. Pat. No. 4,914,408 is that a coupling between two filter channels is effected by means of resistors. An important aim of the present invention is therefore to provide a polyphase bandpass filter wherein such coupling resistors are omitted.
REFERENCES:
patent: 4914408 (1990-04-01), Voorman
patent: 5764171 (1998-06-01), Stivoort
patent: 6035186 (2000-03-01), Moore et al.
de Heij, W.J.A. et al.: “Transconductor and Integrator Circuits for Integrated Bipolar Video Frequency Filters”. Proceedings of the International Symposium on Circuits and Systems, US, New York, IEEE, deel SYMP. 22, May 8, 1989. Pp. 114-117. XP000131576.
Crols, J. et al.: “An Analog Intergrated Polyphase Filter for a High Performance Low-IF Receiver”. Symposium on VLSI Circuits, US, New York, IEEE, Jun. 8, 1995, pp. 87-88. XP000557814.
Burns Doane Swecker & Mathis L.L.P.
Le Dinh T.
Telefonaktiebolaget LM Ericsson (publ)
LandOfFree
Polyphase filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyphase filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyphase filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2949554