Amplifier arrangement comprising two transistors

Details Amplifier arrangement comprising two transistors Amplifier arrangement comprising two transistors

1979-04-09

1981-09-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330272, 330301, H03F 330, H03F 345

Patent

active

042874785

ABSTRACT:
A symmetrical amplifier comprising two transistors having their emitters connected to ground via two resistors of equal value. An input signal is applied between the bases of the transistors and an output signal is available at the collectors of the transistors. This amplifier will provide improved linearity up to an input voltage of 200 mV if, for the emitter resistor, the relationship R.apprxeq.0.56 U.sub.T /I.sub.CO is satisfied, U.sub.T being the thermal voltage and I.sub.CO the collector quiescent current. The value of this resistor is very small so that the slope is reduced only slightly by the emitter resistors and the sensitivity of the circuit is hardly affected thereby.

REFERENCES:
patent: 3466630 (1969-09-01), Mayne et al.
patent: 3506926 (1970-04-01), Shoemaker
patent: 3757239 (1973-09-01), Langan
patent: 4087758 (1978-05-01), Hareyama
Karlsson, "On a Temperature Stabilized Wideband Operational Amplifier", Nuclear Instruments And Methods, vol. 96, No. 3, 1971, pp. 387-395.

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