Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-05-29
2007-05-29
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S263000, C330S267000
Reexamination Certificate
active
11035156
ABSTRACT:
A buffer circuit is arranged for offset cancellation between an input voltage and a buffered voltage. The buffer circuit includes two bias current sources, two p-type transistors, and two n-type transistors. Further, the base-emitter voltages of the two p-type transistors and the two n-type transistors are arranged to form a translinear loop. The translinear loop is arranged to provide the buffered voltage from the input voltage. One of the bias sources is arranged to provide a bias current to one of the p-type transistors, and the other bias circuit is arranged to provide a bias current to one of the n-type transistors. One of the bias current circuits is arranged to actively sense the reverse saturation currents of the p-type transistors and the n-type transistors, and to provide its bias current so that the offset voltage between the input voltage and the buffered voltage is substantially cancelled.
REFERENCES:
patent: 5323122 (1994-06-01), Bowers
patent: 5578967 (1996-11-01), Harvey
patent: 6160451 (2000-12-01), Floru
patent: 6552613 (2003-04-01), Murray et al.
Darby & Darby PC
Gaffney Matthew M.
National Semiconductor Corporation
Nguyen Khanh Van
LandOfFree
Apparatus and method for correction of error caused by... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for correction of error caused by..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for correction of error caused by... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3808391