Folded-cascode amplifier arrangement with current mirror amplifi

Details Folded-cascode amplifier arrangement with current mirror amplifi Folded-cascode amplifier arrangement with current mirror amplifi

1979-11-13

1981-08-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330277, 330288, 330311, H03F 345, H03F 316

Patent

active

042849586

ABSTRACT:
A folded-cascode amplifier arrangement includes first and second transistors of complementary conductivity type and a constant current generator for supplying quiescent current thereto. Signal current flowing in the first transistor is coupled to the second transistor through current steering at the interconnection between their main conduction paths. Signal current flowing in the first transistor is further coupled to the input circuit of a current mirror amplifier (CMA), the output current of which is proportional to the signal current and is coupled to the main conduction path of the second transistor. The output current of the CMA is poled for reinforcing the current flow of the second transistor so that the output current available from the folded-cascode configuration is substantially greater than the signal current in the first transistor. The amplifier voltage-gain transfer function exhibits a frequency response dominated by a single pole.

REFERENCES:
patent: 3979689 (1976-09-01), Schade, Jr.
patent: 4045747 (1977-08-01), Hsu
patent: 4151482 (1979-04-01), Robe
patent: 4152663 (1979-05-01), Van de Sande

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