Operational amplifier

Details Operational amplifier Operational amplifier

1986-03-24

1987-12-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, 330255, 330257, H03F 345

Patent

active

047148942

ABSTRACT:
The invention relates to an operational amplifier (OA) particularly for signal amplification requiring wide bandwidth, high slew rate, and fast settling time. The OA contains two voltage followers rather than differential amplifier in the first stage. The OA has very low number of the components, especially resistors. The common base as the operation mode of the transistors is favored in order to achieve a very high and fastest possible signal amplification. The OA provides a pair of emitter followers having outputs coupled across the base and emitter of a transistor and an amplifier coupled to supply a current to the base of the transistor in response to the collector current thereof.

REFERENCES:
patent: 4059808 (1977-11-01), Sakamoto et al.
patent: 4453092 (1984-06-01), Joseph

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