Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-01-04
2011-01-04
Nguyen, Khanh V (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S253000
Reexamination Certificate
active
07863981
ABSTRACT:
A rail-to-rail operational amplifier has a pair of input terminals and an output terminal, and includes first and second parallel-connected differential input stages configured to generate a differential output signal OUTN, OUTP in response to a differential input signal VINN, VINP received at the pair of input terminals. Each of the first and second differential input stages in turn includes a pair of source-follower transistors and a pair of bulk-driven transistors. The pair of source-follower transistors are respectively coupled between the pair of input terminals and a bulk terminal of the pair of bulk-driven input transistors. Further, the pair of source-follower transistors in the first differential input stage have a different threshold voltage than the source-follower transistors in the second differential input stage.
REFERENCES:
patent: 6366167 (2002-04-01), Stockstad
T. Stockstad et al., “A 0.9-V 0.5- μA Rail-to-Rail CMOS Operational Amplifier”, IEEE Journal of Solid-State Circuits, vol. 37, No. 3, Mar. 2002, pp. 286-292.
Orberk Omer Fatih
Shkidt Alexei
Holland & Hart LLP
Nguyen Khanh V
Spectra Linear, Inc.
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