Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2006-09-19
2006-09-19
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000
Reexamination Certificate
active
07109786
ABSTRACT:
A biquad notch filter includes a first stage having first and second admittances of a first type connected between an input terminal and the control terminal of a transistor, a first current source connected between a first supply terminal and a first terminal of the transistor, a second current source connected between a second terminal of the transistor and a second supply terminal; a third admittance of a second type connected between the control terminal and the second supply terminal, a fourth admittance of a second type connected between the first admittance and the second terminal; and a second stage having a transconductance, including a fifth admittance of the first type, connected between the control terminal and an output terminal, a sixth admittance of the first type connected between the output terminal and the second supply terminal, and a connection of the first terminal to the output terminal.
REFERENCES:
patent: 3501709 (1970-03-01), Uetrecht
patent: 3550027 (1970-12-01), Uetrecht
patent: 4524332 (1985-06-01), Gay
patent: 6407627 (2002-06-01), Martin
Contreras, R., “Generating all Possible Transfer Functions from Known Active Filter Topologies,” inProceedings of the Intl. Symposium on Circuits and Systems, New York, May 3, 1992, vol. 4, conf. 25, pp. 827-830.
Su, P-U., et al., “A Dual-band Enhanced Harmonic Rejection Filter for Modulators in GSM and DCS Transmitters,” inProceedings of the European Solid-State Circuits Conference, Sep. 16, 2003, pp. 663-666.
Iannucci Robert
Le Dinh T.
Seed IP Law Group PLLC
STMicroelectronics S.A.
LandOfFree
Biquad notch 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 Biquad notch filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Biquad notch filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3615807