Oscillators – Electrical noise or random wave generator
Patent
1978-07-28
1979-11-20
Grimm, Siegfried H.
Oscillators
Electrical noise or random wave generator
H03B 2900
Patent
active
041752589
ABSTRACT:
A wide band, stable, random noise source with a high and well-defined output power spectral density is provided which may be used for accurate calibration of Johnson Noise Power Thermometers (JNPT) and other applications requiring a stable, wide band, well-defined noise power spectral density. The noise source is based on the fact that the open-circuit thermal noise voltage of a feedback resistor, connecting the output to the input of a special inverting amplifier, is available at the amplifier output from an equivalent low output impedance caused by the feedback mechanism. The noise power spectral density level at the noise source output is equivalent to the density of the open-circuit thermal noise or a 100 ohm resistor at a temperature of approximately 64,000 Kelvins. The noise source has an output power spectral density that is flat to within 0.1% (0.0043 db) in the frequency range of from 1 KHz to 100 KHz which brackets typical passbands of the signal-processing channels of JNPT's. Two embodiments, one of higher accuracy that is suitable for use as a standards instrument and another that is particularly adapted for ambient temperature operation, are illustrated in this application.
REFERENCES:
patent: 3573652 (1971-04-01), Charters
patent: 3866128 (1975-02-01), Fletcher et al.
Blalock Theron V.
Borkowski Casimer J.
Breeden David E.
Carlson Dean E.
Grimm Siegfried H.
Hamel Stephen D.
The United States of America as represented by the United States
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