Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1996-04-17
1999-02-09
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 9, 330 51, 330257, 330258, 324676, 324679, H03F 345, G01R 2726
Patent
active
058699996
ABSTRACT:
A fast, open-loop amplifier for an electronic measuring system is formed by a folded, differential, open-loop amplifier. This amplifier includes a differential common-source portion, a current mirror portion and a load portion. The current mirror portion is connected between the differential common-source portion and the load portion. The load portion is connected to a common voltage supply portion. The fast, open-loop amplifier can include multiple stages, where each stage includes the folded, differential, open-loop amplifier. In this case, each stage can have its own common voltage supply portion. Alternatively, a single common voltage supply portion can be shared between the stages. All the transistors of the differential common source portion and the load portion have the same type of doping, while all the transistors of the current mirror are the same type of doping, but of a type which is different than that used in the differential common source amplifier portion and the load portion.
REFERENCES:
patent: 4459555 (1984-07-01), Jett, Jr.
patent: 4574250 (1986-03-01), Senderowicz
patent: 4879508 (1989-11-01), Andermo
Mitutoyo Corporation
Mullins James B.
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