Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-03-27
2007-03-27
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
Reexamination Certificate
active
11134122
ABSTRACT:
An amplifier circuit includes first (7A) and second (7B) operational amplifiers connected in a generally parallel configuration, each with inputs coupled through the same pair of matched input resistors which receive a differential input signal that may have both a positive and negative common mode range. An offset adjustment amplifier (17) receives a differential error signal representative of the difference between offset voltages of the first and second operational amplifiers and generates offset adjustment signals that are applied to input stages of the first and second operational amplifiers to adjust their respective offset voltages so as to equalize them. With the offset voltages equalized, the first and second operational amplifiers operate seamlessly as a common mode component of the differential input signal undergoes a transition from its positive to its negative range, so as to avoid inaccuracies and abrupt changes in an output voltage during the transition, the output voltage being produced in response to outputs of both first and second operational amplifiers.
REFERENCES:
patent: 5276405 (1994-01-01), Mazzucco et al.
patent: 6538503 (2003-03-01), Burt
patent: 2006/0122529 (2006-06-01), Tsau
Alenin Sergey V.
Gammie David A.
Brady III W. James
Nguyen Hieu
Pascal Robert
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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