Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-06-07
2011-06-07
Barnie, Rexford N (Department: 2819)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S258000, C326S082000, C326S084000, C326S086000
Reexamination Certificate
active
07956688
ABSTRACT:
Embodiments of the invention include a common mode cancellation circuit and method for correcting signal skew in a differential circuit. According to one embodiment, an op amp circuit is used to correct the mismatch between transmission line lengths in the differential circuit. The CMCC can be embodied as an ASIC and added on to an existing differential signaling systems to correct and compensate for board wiring skew or other causes of phase misalignment. The result is restoration of the cross-over intersection of the plus and minus signals of the differential pair closer to the common voltage level point, as if the signals had been in phase.
REFERENCES:
patent: 5166635 (1992-11-01), Shih
patent: 5281924 (1994-01-01), Maloberti et al.
patent: 5796301 (1998-08-01), Tanabe et al.
patent: 5990737 (1999-11-01), Czarnul et al.
patent: 6865382 (2005-03-01), Behzad
patent: 6891435 (2005-05-01), Patel et al.
patent: 6958653 (2005-10-01), Vaara et al.
patent: 7088179 (2006-08-01), Gilbert et al.
patent: 7113121 (2006-09-01), Sutardja et al.
patent: 7215148 (2007-05-01), Johnson et al.
patent: 7248079 (2007-07-01), Bhattacharya et al.
patent: 7271651 (2007-09-01), Chen et al.
patent: 7295068 (2007-11-01), Capofreddi et al.
patent: 7298837 (2007-11-01), Patterson
patent: 7508235 (2009-03-01), Singor
patent: 7535258 (2009-05-01), Johnson et al.
patent: 7609097 (2009-10-01), Leonowich et al.
patent: 7831234 (2010-11-01), Schelmbauer et al.
patent: 7855576 (2010-12-01), Luo et al.
patent: 2003/0085737 (2003-05-01), Tinsley et al.
patent: 2005/0285629 (2005-12-01), Hein et al.
patent: 2006/0006912 (2006-01-01), Leonowich et al.
patent: 2007/0115030 (2007-05-01), Bhattacharya et al.
patent: 2007/0285128 (2007-12-01), Singor
patent: 2009/0140778 (2009-06-01), Kikuchi et al.
Ahmed Rubina F.
Herrman Bradley D.
Patel Pravin
Seidel Peter R.
Barnie Rexford N
International Business Machines - Corporation
Seal Cynthia G.
Streets Jeffrey L.
Tabler Matthew C
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