Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2007-05-01
2007-05-01
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
Reexamination Certificate
active
10817499
ABSTRACT:
Disclosed is a filter circuit assembly that includes a filter stage with a variable resistor and a resistor/capacitor (RC) oscillator. A controlling output of the RC oscillator controls the value of the variable resistor. The RC oscillator itself also includes a variable resistor. The controlling output of the RC oscillator also controls the value of the variable resistor of the RC oscillator. The structure of the variable resistor of the filter stage is substantially the same as the structure of the variable resistor of the RC oscillator.
REFERENCES:
patent: 4785253 (1988-11-01), Hughes
patent: 4983931 (1991-01-01), Nakano
patent: 5117199 (1992-05-01), Wang et al.
patent: 5418492 (1995-05-01), Wang et al.
patent: 6097244 (2000-08-01), Chen
patent: 6100766 (2000-08-01), Segawa et al.
patent: 6137375 (2000-10-01), Li
patent: 6407627 (2002-06-01), Martin
patent: 6593802 (2003-07-01), Mariani et al.
patent: 6646498 (2003-11-01), Mohieldin et al.
patent: 6677814 (2004-01-01), Low et al.
patent: 6710644 (2004-03-01), Duncan et al.
patent: 6803813 (2004-10-01), Pham
patent: 6842710 (2005-01-01), Gehring et al.
patent: 0549354 (1993-06-01), None
patent: 1326336 (2003-07-01), None
Peng-Un Su, et al. “A Dual-Band Enhanced Harmonic Rejection Filter for Modulators in GSM and DCS Transmitters” European Solid-State Circuits, 2003. ESSCIRC '03, Conference on Sep. 16-18, 2003, Piscataway, NJ, USA, IEEE, Sep. 16, 2003, pp. 663-666, XP010678502, ISBN 0-7803-7995-0.
Elwan H. et al., “A New Generation of Global Wireless Compatibility”, IEEE Circuits and Devices Magazine, IEEE Inc. New York, US vol. 17, No. 1, Jan. 1, 2001, pp. 7-19, XP001102313, ISSN: 8755-3996.
Wang et al., “Methodology for Building Tunable Integrated Low-pass Analog Filters”, IBM Technical Disclosure Bulletin, IBM Corp., New York, US, Oct. 1, 1992, pp. 103-106, XP000312902, ISSN: 0018-8689.
Sallen R.P. et al, “A Practical Method of Designing RC Active Filters”, IRE Transactions on Circuits Theory, IEEE Inc., New York, US, vol. 2, Mar., 1955, pp. 51-62, XP001026856.
Chao-Shiun Wang et al., “A CMOS Low-IF Programmable Gain Amplifier with Speed-enhanced DC Offset Cancellation”, ASIC, 2002. Proceedings, 2002 IEEE Asia Pacific Conference on Aug. 6, 2002, pp. 133-136, XP010602811, ISBN 0-7803-7363-4.
Search Report-European Application #05252079.8-2215, dated Sep. 5, 2006.
Yannis P. Tsividis, “Integrated Continuous-Time Filter Design-An Overview”, 8107 IEEE Journal of Solid-State Circuits, IEEE Service Center, Piscataway, NJ, US, vol. 29, No. 3, Mar. 1, 1994, pp. 166-176, XP000452103, ISSN:0018-9200.
Francissen Vernon W.
Francissen Patent Law, P.C.
Integration Associates Inc.
Le Dinh T.
LandOfFree
Tunable Sallen-Key filter stage and filter assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tunable Sallen-Key filter stage and filter assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tunable Sallen-Key filter stage and filter assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3772602