Differential common base amplifier with feed forward circuit

Amplifiers – With semiconductor amplifying device – Including differential amplifier

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330151, 330258, 330300, H03F 345

Patent

active

045969582

ABSTRACT:
A differential common base amplifier circuit includes first and second source follower field effect transistors that apply a differential input signal between the emitters of first and second bipolar transistors having a common base connection. An output circuit connected to the collector of the first bipolar transistor includes a bipolar emitter follower transistor having its emitter connected to a first field effect transistor which is connected to the emitter of the emitter follower transistor. The gate of the first field effect transistor is connected to the gate of one of the source follower field effect transistors. Process-caused variations in the gate to source voltage characteristic of the second source follower field effect transistor and the first field effect transistor are applied equally to the emitter and collector of the second bipolar transistor. This avoids input offset errors due to base width variations in the second bipolar transistor. Feed-forward signals coupled to the emitter of the emitter follower transistor in response to the input signal prevent roll off of the frequency response of the differential common base amplifier, due to the high frequency response of the emitter follower transistor when operated in what is, in effect, a common base configuration.

REFERENCES:
Jaeger, "High-Performance Input, Stage for Integrated Operational Amplifiers", IBM Technical Disclosure Bulletin, vol. 18, No. 6, Nov. 1975, pp. 1695, 1696.

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