Operational amplifier with improved output capability

Amplifiers – With semiconductor amplifying device – Including push-pull amplifier

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Details

330265, 330267, H03F 318, H03F 326

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active

044544790

ABSTRACT:
The disclosed operational amplifier comprises a first pair of complementary type transistors (Q5, Q6) (of high current carrying capacity) that have their emitter-collector paths connected in series across a source of reference potential. The emitters of the transistors are connected together and to an output terminal (17). A second pair of complementary type transistors (Q3, Q4) are coupled across said reference potential, each transistor of said second pair being coupled across the similar conductivity type transistor of said first pair. A first pair of resistances (R1, R2) of predetermined value are respectively connected between the bases of the similar conductivity type transistors of said first and second pair. A second pair of resistances (R3, R4) respectively connect the emitters of the transistors of said second pair to said output terminal. Each of said second pair of resistances has a value substantially equal to said predetermined value plus the intrinsic base resistance of the transistors of the first pair. A pair of current mirror circuits (Q11, Q13, and Q12, Q14) are respectively coupled from the collectors of said second pair of transistors to the bases of the similar conductivity type transistors of said first pair to provide the additional base drive required by the first pair of transistors for large current output therefrom.

REFERENCES:
patent: 3723896 (1973-03-01), Flickinger
patent: 4404528 (1983-09-01), Yamaguchi
"Fast Slewing Monolithic Operational Amplifier", by W. E. Hearn, IEEE Journal of Solid-State Circuits, vol. SC-6, No. 1, Feb. 1971, pp. 20-24.
"Transistor Circuit Engineering", by R. F. Shea, John Wiley & Sons, Inc., 1957, pp. 130-131.

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