Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
2011-07-19
2011-07-19
Milord, Marceau (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
C455S020000, C455S085000, C455S307000, C327S552000, C327S554000, C327S427000, C333S202000, C333S206000, C333S175000
Reexamination Certificate
active
07983625
ABSTRACT:
A notch filter suitable for attenuating certain frequencies of a radio-frequency signal includes an input for receiving the radio-frequency signal and an output for the output of a portion of the radio-frequency signal, first and second capacitive means, at least one inductor and a negative resistance circuit suitable for compensating the resistive losses of said at least one inductor. The inductor and the first and second capacitive means are placed to produce a resonator and the filter comprises a control device suitable for controlling the negative resistance circuit. The input impedance of the filter comprises a pole and a zero, with the pole depending on the second capacitive means and the zero depending on both the first and second capacitive means. The first and second capacitive means are variable and the control device is suitable for controlling the first and second capacitive means.
REFERENCES:
patent: 4517602 (1985-05-01), Murphy et al.
patent: 4598252 (1986-07-01), Andricos
patent: 4945311 (1990-07-01), Smith
patent: 5140703 (1992-08-01), Payne
patent: 5148121 (1992-09-01), Uchida
patent: 5349254 (1994-09-01), Sakarya
patent: 5604460 (1997-02-01), Sehrig et al.
patent: 5834975 (1998-11-01), Bartlett et al.
patent: 5861776 (1999-01-01), Swanson
patent: 5912582 (1999-06-01), Pisati et al.
patent: 5933771 (1999-08-01), Tiller et al.
patent: 6093981 (2000-07-01), Cali' et al.
patent: 6265901 (2001-07-01), Stern et al.
patent: 6307442 (2001-10-01), Meyer et al.
patent: 6684065 (2004-01-01), Bult et al.
patent: 6812770 (2004-11-01), Filoramo et al.
patent: 6987966 (2006-01-01), Wu et al.
patent: 6990327 (2006-01-01), Zheng et al.
patent: 7132861 (2006-11-01), Fu et al.
patent: 7142042 (2006-11-01), Henry
patent: 7161416 (2007-01-01), Gangi
patent: 7546107 (2009-06-01), Noda et al.
patent: 7548726 (2009-06-01), Rofougaran
patent: 7672648 (2010-03-01), Groe et al.
patent: 7702294 (2010-04-01), Granata
European Search Report No. EP 05 42 5715.
Samavati et al. “A 5-GHz CMOS Wireless LAN Receiver Front End”; IEEE Journal of Solid-State Circuits; May 2000; pp. 765-772; vol. 35, No. 5.
Guo et al. “A Fully Integrated 900-MHz CMOS Wireless Receiver with On-Chip RF and IF Filters and 79-dB Image Rejection”; IEEE Journal of Solid-State Circuits; Aug. 2002; pp. 1084-1089; vol. 37, No. 8.
Hogan & Lovells US LLP
Kubida William J.
Meza Peter J.
Milord Marceau
ST-Ericsson SA
LandOfFree
Notch filter and apparatus for receiving and transmitting... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Notch filter and apparatus for receiving and transmitting..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Notch filter and apparatus for receiving and transmitting... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2724022