Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-02-27
2007-02-27
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S253000
Reexamination Certificate
active
11103758
ABSTRACT:
A differential amplifying apparatus includes first and second differential transistor pairs of different polarities operated by different constant currents, and first to sixth current mirror circuits. The second, third, fifth, and sixth current mirror circuits are connected to an output terminal. The first, second, and sixth current mirror circuits receive a first power supply voltage, and the third, fourth, and fifth current mirror circuits receive a second power supply voltage. The first and second current mirror circuits respectively output mirror currents based on respective corresponding currents flowing through the first differential transistor pair. The third current mirror circuit outputs a current input from the first current mirror circuit. The fourth and fifth current mirror circuits respectively output mirror currents based on respective corresponding currents flowing through the second differential transistor pair. The sixth current mirror circuit outputs a current input from the fourth current mirror circuit.
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Cooper & Dunham LLP
Nguyen Khanh Van
Ricoh & Company, Ltd.
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