Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2008-11-06
2010-06-01
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S261000, C330S253000
Reexamination Certificate
active
07728669
ABSTRACT:
The present invention relates to an output stage circuit and an operational amplifier thereof. In the output stage circuit, one of a gate of a transistor is coupled to a gate of a bias transistor and a level shifter in response to a small signal outputted from an amplifying circuit in the operational amplifier. In addition, a gate voltage of the bias transistor is controlled by a voltage generating circuit to control a DC bias of the transistor of the output stage circuit. Therefore, extra frequency compensating components for compensating the transistor of the output stage circuit is no longer necessary, and saving circuit layout area and cost can be achieved by the present invention.
REFERENCES:
patent: 4048575 (1977-09-01), Musa
patent: 4267517 (1981-05-01), Iida et al.
patent: 4462002 (1984-07-01), Schade, Jr.
patent: 7248104 (2007-07-01), Wang
patent: 7414474 (2008-08-01), Yamada et al.
patent: 7474153 (2009-01-01), Dasgupta
De Langen et al., “Compact Low-Voltage Power-Efficient Operational Amplifier Cells for VLSI, IEEE Journal of Solid State Circuits,” Oct. 1998, pp. 1482-1496, vol. 33, No. 10.
Muncy Geissler Olds & Lowe, PLLC
Nguyen Patricia
Realtek Semiconductor Corp.
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