Common mode rail-to-rail amplifier with a constant transconducta

Details Common mode rail-to-rail amplifier with a constant transconducta Common mode rail-to-rail amplifier with a constant transconducta

1995-12-18

1998-03-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330261, 330311, H03F 345

Patent

active

057291772

ABSTRACT:
An amplifier includes two complementary differential input stages and a first current source that is switched as a function of the input voltage of the amplifier in order to render active one or the other of the input stages by establishing the quiescent current of the input stage. A folded cascode stage has two cascode transistors whose currents are determined by a bias voltage of these transistors and reduced by the currents circulating in the output branches of a first of the differential input stages. Circuitry switched at the same time as the first current source for maintaining a constant current in the cascode transistors when one of the differential stages changes between an active state and an inactive state.

REFERENCES:
patent: 4532479 (1985-07-01), Blauschild
patent: 4649352 (1987-03-01), Blauschild
patent: 4918398 (1990-04-01), Huijsing et al.
patent: 5153529 (1992-10-01), Koda et al.
patent: 5311145 (1994-05-01), Huijsing et al.
French Search Report from French Patent Application 94 15672, filed Dec. 21, 1994.
IEEE Journal Of Solid State Circuits, vol. 24, No. 6, Dec. 1989, pp. 1551-1559, Fonderie, et al., "1-V Operational Amplifier With Rail To Rail Input and Output Ranges".

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