Operational amplifier having improved slew rate/bandwidth charac

Details Operational amplifier having improved slew rate/bandwidth charac Operational amplifier having improved slew rate/bandwidth charac

1981-03-16

1983-06-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330300, 330311, H03F 345

Patent

active

043908500

ABSTRACT:
An operational amplifier includes in its first stage current splitting means which enables the slew rate to be varied independently of bandwidth. A pair of dual collector transistors are coupled between the amplifier's input devices and a current mirror circuit. Only one collector of each of the split collector devices is coupled to the current mirror circuit and the current flowing therethrough is controlled by varying the area of the second collector. Slew rate and bandwidth are then controlled by proper selection of current and the ratio of the collector areas.

REFERENCES:
Brokaw et al, "A Fast, High-Precision, Laser-Trimmed FET Input Operational Amplifier," 1974 IEEE International Solid-State Circuits Conference, Feb. 14, 1974, pp. 142, 143, 244.

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