Operational amplifier

Details Operational amplifier Operational amplifier

2007-08-28

2007-08-28

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

11107916

ABSTRACT:
The present invention is a folded cascode operational amplifier provided with a differential input portion10, cascode current source portion20, current mirror portion30, output portion40, and differential amplifier50serving as a differential amplifying portion. The differential input portion10has P-type MOS transistors M2and M3of a differential pair for respectively inputting a differential signal and the MOS transistors M2and M3are respectively provided with a well terminal. The differential amplifier50compares the source voltage of each of the MOS transistors M2and M3with a predetermined reference voltage Vref, generates an output voltage in accordance with the comparison result, and supplies the generated output voltage to well terminals as well voltages of the MOS transistors M2and M3. An operational amplifier is provided which performs the rail-to-rail operation at a low voltage and in which an input current is zero.

REFERENCES:
patent: 6064262 (2000-05-01), Wang
patent: 02-231760 (1990-09-01), None
patent: 05-102756 (1993-04-01), None
patent: 11-088078 (1999-03-01), None
patent: 2001-284535 (2001-10-01), None
Duque-Carrillo et al., “1-V Rail-to-Rail Operational Amplifiers in Standard CMOS Technology”, IEEE Journal of Solid-State Circuits, vol. 35, No. 1, pp. 33-44, (2000).

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