Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-05-05
1999-03-09
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330255, 330311, H03F 345
Patent
active
058806377
ABSTRACT:
An operational amplifier includes a differential amplifier including a first transistor (120) and a second transistor (122), a gain stage (125), a first folded cascode stage (104) and a second folded cascode stage 106, and a first telescopic stage (108) and a second telescopic stage (110). The folded cascode stages respond to current in the differential amplifier to control the output signal, and the telescopic stages respond to a differential voltage produced by the gain stage to control the output signal.
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Nakamura et al., "An Enhanced Fully Differential Folded-Cascode Op Amp", IEEE Journal of Solid-State Circuits, vol. 27, No. 4, Apr., 1992, pp. 563-568.
Banu et al., "Fully Differential Operational Amplifiers with Accurate Output Balancing", IEEE Journal of Solid-State Circuits, vol. 23, No. 6, Dec. 1988, pp. 1410-1414.
Motorola Inc.
Mullins James B.
Rauch John G.
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