Amplifiers – Sum and difference amplifiers
Reexamination Certificate
2006-05-02
2006-05-02
Nguyen, Khanh V. (Department: 2817)
Amplifiers
Sum and difference amplifiers
C330S258000
Reexamination Certificate
active
07038537
ABSTRACT:
An operational amplifier circuit is constituted by first and second inverted amplifier circuits (A1, A2) that receive first and second input signals, a third inverted amplifier circuit (A3) that receives an estimated common-mode output signal and an output signal from the first inverted amplifier circuit and outputs first and second output signals, a fourth inverted amplifier circuit (A4) that receives the estimated common-mode output signal and an output signal from the second inverted amplifier circuit and outputs third and fourth output signals, where the estimated common-mode output signal is generated by adding the second output signal and the fourth output signal, and first and second non-inverted amplifier circuits (A5, A6) that receive the estimated common-mode output signal and feed it back to the first and second inverted amplifier circuits.
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Itakura Tetsuro
Yamaji Takafumi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Nguyen Khanh V.
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