Operational amplifier of class AB

Details Operational amplifier of class AB Operational amplifier of class AB

2007-05-30

2009-08-18

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000, C330S255000, C330S257000, C330S261000

Reexamination Certificate

active

07576610

ABSTRACT:
A class AB operational amplifier is provided that includes first and second input transistors respectively coupled between first and second internal nodes and a first common node, first and second input stage load transistors diode connected and respectively coupled between a first voltage reference and the first and second internal nodes, first and second output transistors coupled in series between the first voltage reference and a second voltage reference, a tail current generator coupled between the first common node and the second voltage reference, an adaptive bias block coupled between the first and second voltage references and coupled to the first common node, and a positive feedback network coupled between the first voltage reference and the first and second internal nodes. Also provided is an integrated circuit having at least one such operational amplifier.

REFERENCES:
patent: 6600483 (2003-07-01), Akita et al.
patent: 6771126 (2004-08-01), Blankenship et al.
patent: 7061320 (2006-06-01), Kimura et al.
patent: 0 776 087 (1996-08-01), None
Noceti Filho S et al., “New CMOS OTA for Fully Integrated Continuous-Time Circuit Applications”, Electronics Letters, vol. 25, No. 24, Nov. 23, 1989, pp. 1674-1675, XP000075000 Issn: 0013-5194; Section: Convertor realisation; Figure 2; IEE Stevenage, GB.
European Search Report dated Oct. 20, 2006 for European Application No. EP 06 01 1220.

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