Low noise amplifiers

Details Low noise amplifiers Low noise amplifiers

1979-04-16

1981-04-28

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

H03F 126

Patent

active

042648718

ABSTRACT:
Circuits are described which optimize the signal-to-noise ratio of a signal amplifier by means of active circuits which simulate low-noise resistors. When such "absorbers" or "desorbers," as they are termed, are used in amplifier circuits with signal sources characterized by equivalent thermal noise resistances they provide low-noise means for matching the source and amplifier for optimum noise behavior. In accordance with the invention therefore, it is possible to utilize active circuit elements such as transistors or op-amps in such a way as to realize amplifiers which have better noise figures than conventional amplifiers fabricated of the same circuit elements.

REFERENCES:
patent: 3079569 (1963-02-01), De Loach
patent: 4156859 (1979-05-01), Forward et al.
patent: 4180786 (1979-12-01), Forward et al.
Graeme, "Don't Minimize Noise Figures", Electronic Design 2, Jan. 21, 1971, pp. 62-64.

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