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

2009-05-19

2010-12-21

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000

Reexamination Certificate

active

07855600

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: 6392485 (2002-05-01), Doi et al.
patent: 6486736 (2002-11-01), Cusinato et al.
patent: 6717468 (2004-04-01), Jeong et al.
patent: 7253685 (2007-08-01), Chung
patent: 7271653 (2007-09-01), Chung
patent: 7663439 (2010-02-01), Chang
patent: 2006/0012431 (2006-01-01), Chung
patent: 2006/0066400 (2006-03-01), Kang et al.
patent: 2009/0146738 (2009-06-01), Chang
patent: 20030229725 (2003-08-01), None
patent: 1020040018838 (2004-03-01), None

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