Two-stage operational amplifier with class AB output stage

Details Two-stage operational amplifier with class AB output stage Two-stage operational amplifier with class AB output stage

2008-01-10

2009-06-23

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

07551030

ABSTRACT:
An operational amplifier includes a differential amplifier including an active load, a current mirror including a first branch and a second branch, a first switch connected between a first power source and an output node and switched in response to a voltage of a first output terminal of the differential amplifier, a first bias circuit to control an amount of a reference current flowing in the first branch in response to a voltage of a second output terminal of the differential amplifier, a second bias circuit to control a voltage of the second branch in which a mirror current flows, in response to a voltage of the first output terminal, a second switch connected between the output node and a second power source and switched in response to a voltage of the second branch, and a capacitor connected between the output node and the first output terminal.

REFERENCES:
patent: 6384685 (2002-05-01), Juang
patent: 6486736 (2002-11-01), Cusinato et al.
patent: 6717468 (2004-04-01), Jeong et al.
patent: 7453318 (2008-11-01), Higuchi
patent: 7474152 (2009-01-01), Hatanaka
patent: 7489193 (2009-02-01), Adachi
patent: 20030229725 (2003-08-01), None
patent: 1020040018838 (2004-03-01), None

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