Impedance-matching circuit using negative low-noise resistance

Details Impedance-matching circuit using negative low-noise resistance Impedance-matching circuit using negative low-noise resistance

1978-07-31

1979-12-25

Gensler, Paul L.

Wave transmission lines and networks

Coupling networks

With impedance matching

307DIG1, 330149, 333217, H03H 738

Patent

active

041807863

ABSTRACT:
A circuit is disclosed for impedance matching an electrical signal-generating transducer to an electrical signal-processing amplifier while substantially retaining both the original signal-to-noise power ratio and the original signal amplitude at the input to the amplifier. A load resistance of a value substantially equal to twice the characteristic resistance of the transducer is coupled across the amplifier input, while a negative low-noise resistance approximately equal in magnitude to the source resistance is coupled in series with the load resistance. A transmission line having a characteristic impedance approximately equal to the transducer resistance is coupled between the transducer output and the series-coupled load resistance and negative resistance.

REFERENCES:
patent: 3051846 (1962-08-01), Schott
patent: 3079569 (1963-02-01), De Loach, Jr.
patent: 3187266 (1965-06-01), Marshall, Jr.

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