Telescopic operational amplifier and reference buffer...

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Reexamination Certificate

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Reexamination Certificate

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07605654

ABSTRACT:
A telescopic operational amplifier including a current source, an input stage, and a load stage is provided. The input stage is coupled to the current source and includes a group of input transistors for receiving an input voltage. The load stage is coupled to the input stage and includes a group of load transistors for outputting an output voltage. The threshold voltages of the group of input transistors are larger than that of the group of load transistors.

REFERENCES:
patent: 6833760 (2004-12-01), Aude
patent: 7224224 (2007-05-01), Sera et al.
patent: 7432762 (2008-10-01), Bhattacharya et al.

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