Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2006-05-04
2010-06-15
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000
Reexamination Certificate
active
07737772
ABSTRACT:
A bandwidth-adjustable filter includes an operational amplifier, a first resistor, a first capacitor and a first resistor ladder circuit. The operational amplifier has a negative input terminal and a positive input terminal. The first resistor is coupled to one of the input terminals of the operational amplifier. The first capacitor is coupled to the first resistor. The first resistor ladder circuit is coupled in parallel to the first resistor for changing the resistance of the first resistor so as to adjust the bandwidth of the filter.
REFERENCES:
patent: 3735393 (1973-05-01), Carbrey
patent: 3863200 (1975-01-01), Miller
patent: 3863201 (1975-01-01), Briggs et al.
patent: 4037170 (1977-07-01), Richards
patent: 4484295 (1984-11-01), Bedard et al.
patent: 5201009 (1993-04-01), Yamada et al.
patent: 5231627 (1993-07-01), Paul et al.
patent: 5408199 (1995-04-01), Nagano et al.
patent: 5455582 (1995-10-01), Valdenaire
patent: 5525985 (1996-06-01), Schlotterer et al.
patent: 5535985 (1996-07-01), Larbuisson
patent: 5604927 (1997-02-01), Moore
patent: 5917387 (1999-06-01), Rice et al.
patent: 5999052 (1999-12-01), Tang
patent: 6127893 (2000-10-01), Llewellyn et al.
patent: 6175278 (2001-01-01), Hasegawa
patent: 6344780 (2002-02-01), Dobashi et al.
patent: 6545534 (2003-04-01), Mehr
patent: 6693491 (2004-02-01), Delano
patent: 6703682 (2004-03-01), Aswell
patent: 6731160 (2004-05-01), Behzad
patent: 7057451 (2006-06-01), Lou et al.
patent: 7102441 (2006-09-01), Lee et al.
patent: 7138869 (2006-11-01), Lee et al.
patent: 7239196 (2007-07-01), Hasegawa
patent: 2004/0232981 (2004-11-01), Lee et al.
patent: 2005/0008107 (2005-01-01), Brown
Lee Chao-Cheng
Lin Ying-Yao
Donovan Lincoln
O'Neill Patrick
Realtek Semiconductor Corp.
Thomas Kayden Horstemeyer & Risley
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