Low noise differential amplifier

Details Low noise differential amplifier Low noise differential amplifier

1981-12-03

1984-07-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330256, 330149, H03F 345

Patent

active

044608721

ABSTRACT:
A low noise amplifier circuit (FIGS. 4 and 5) is disclosed including plural differential amplifiers having their inputs and outputs connected to common input and output lines (50, 52; 54, 56). In the disclosure, each differential amplifier is comprised of a pair of bipolar junction transistors (40, 42; 58, 60; 64, 66) of the same type. Parallel connecting of the differential amplifiers in the disclosed fashion reduces the Johnson noise introduced by the base spreading resistances of the individual transistors. Since differential amplifiers, per se, are connected in parallel rather than their component transistors, thermal runaway is not a problem.

REFERENCES:
patent: 4035737 (1977-07-01), Curl
patent: 4210875 (1980-07-01), Beasom
Millican, D. L., "Four-Level Gain Control Stage", IBM Technical Disclosure Bulletin, vol. 14, No. 9, Feb. 1972.

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