Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-08-16
2011-08-16
Nguyen, Khanh V (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S260000
Reexamination Certificate
active
07999616
ABSTRACT:
The invention provides an operational amplifier. In one embodiment, the operational amplifier includes an input stage circuit, a feedback circuit, a fixed stage circuit, and an output stage circuit. The input stage circuit receives a positive input voltage and a negative input voltage, and amplifies the positive input voltage and the negative input voltage to output a first positive output voltage and a first negative output voltage. The feedback circuit generates a reference positive output voltage equal to the first positive output voltage according to the positive input voltage and the negative input voltage. The fixed stage circuit equally amplifies the first negative output voltage and the reference positive output voltage to generate a second positive output voltage and a second negative output voltage. The output stage circuit generates an output voltage according to a difference voltage between the second positive output voltage and a second negative voltage.
REFERENCES:
patent: 5907259 (1999-05-01), Yamada et al.
patent: 7330074 (2008-02-01), Kang et al.
Muncy Geissler Olds & Lowe, PLLC
Nguyen Khanh V
Princeton Technology Corporation
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