Differential amplifier with bipolar transistors which is compati

Details Differential amplifier with bipolar transistors which is compati Differential amplifier with bipolar transistors which is compati

1984-03-12

1986-04-01

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, 330300, H03F 345

Patent

active

045801061

ABSTRACT:
There is disclosed a differential amplifier which comprises bipolar transistors which may be produced using MOS technology and wherein the amplifier is particularly useful when the transistors have a poorly defined current gain. The amplifier includes a first pair of transistors having emitters connected in common and having bases forming the inputs to the differential amplifier. A second pair of transistors identical to the first pair are coupled such that the emitters and bases of said second pair are connected respectively to the emitters and bases of the first pair. The collectors of the second pair of transistors are connected to a current generator and to the input of a transconductance amplifier such that the transconductance amplifier causes the sum of the emitter currents of the first and second pairs of transistors to be controlled by the current supplied by the current generator.

REFERENCES:
patent: 4213098 (1980-07-01), Tsividis

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