Low-noise preamplifier, in particular, for nuclear magnetic...

Details Low-noise preamplifier, in particular, for nuclear magnetic... Low-noise preamplifier, in particular, for nuclear magnetic...

2006-10-17

2006-10-17

Mottola, Steven J. (Department: 2817)

Amplifiers

Interstage coupling

Transformer coupling

C330S079000

Reexamination Certificate

active

07123090

ABSTRACT:
A low-noise preamplifier with an electronic amplifying element having an input (2) and an output (4), and with a first transformer (6) having a primary winding (5) and a secondary winding (8) is characterized in that the input (2) of the electronic amplifying element is the base of a transistor, the gate (G) of a field effect transistor (FET) or the grid of a vacuum tube, and the output (4) of the electronic amplifying element is the collector, the drain (D) or the anode, the output current (Ip) being passed from the electronic amplifying element through the primary winding (5) of the first transformer (6) to the output (7) of the preamplifier, wherein the secondary winding (8) of the first transformer (6) is connected to the input (2) of the electronic amplifying element. This preamplifier can be operated with extremely low noise and at any input impedance, in particular, at 50 ohms or 75 ohms.

REFERENCES:
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patent: 5545999 (1996-08-01), Mueller
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patent: 0591032 (1994-04-01), None
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Preamplifier Circuit Diagram NMR Spectrometer CXP 100, Bruker, 1980.
Tucker, D.G., “The History of Positive Feedback”, Radio and Electronic Engineer, vol. 42, No. 2, Feb. 1972, p. 74.

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