Low-noise RF preamplifier (especially for nuclear magnetic reson

Details Low-noise RF preamplifier (especially for nuclear magnetic reson Low-noise RF preamplifier (especially for nuclear magnetic reson

1985-05-06

1986-12-23

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

330295, H03F 304

Patent

active

046314954

ABSTRACT:
A low-noise radio-frequency preamplifier, especially suited for use in the reception channel of a nuclear magnetic resonance spectrometer and the like, utilizes a low-noise input stage having a plurality of bipolar junction transistors effectively connected in radio-frequency parallel, but with each of the plurality of parallel bipolar transistors isolated from one another for direct current flow through at least one electrode thereof.

REFERENCES:
patent: 4090150 (1978-05-01), Vachenauer
patent: 4348643 (1982-09-01), Tennyson
Prasad, KBR et al., "Low Noise, Low Frequency Amplifier", Electro-Technology, vol. 15, No. 4, Jul.-Aug. 1971, pp. 133-135.
Stoll, M. E., "Simple Fast Recovery, Low-Noise Receiver Amplifier for Pulsed NMR Experiments", Rev. Sci. Instrum. 52(3), Mar. 1981, pp. 391-395.

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