Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1986-04-21
1988-05-31
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 77B, G01R 2700
Patent
active
047483997
ABSTRACT:
A multichannel phase noise measuring system is disclosed which is capable of measuring the phase noise of two signal source operating between 100 MH.sub.z and 24 GH.sub.z. This system has two input channels and a mixer which produces a difference frequency between the signals received in the input channels. The difference frequency containing the phase noise is frequency multiplied and amplified to raise the phase noise level 12 dB. The multiplied and amplified difference signal is phase locked to a commercially available frequency synthesizer with inferior noise characteristics to the units being tested. By amplifying the phase noise of the original signals above the phase noise levels of the commercially available frequency synthesizer, they become measurable.
REFERENCES:
patent: 3535635 (1970-10-01), Okumura
patent: 3619774 (1971-11-01), Landwehr
patent: 3711769 (1973-01-01), Peake
patent: 3716785 (1973-02-01), Masters et al.
patent: 3835378 (1974-09-01), Edden et al.
Reynolds, "Measure Phase Noise in One of Three Ways", Electronics Design 4, 15 Feb. 1977, pp. 106-108.
Sal'nichenko, "Low-Frequency Noise Spectrum Analyzer", Instrum. & Exp. Tech. (USA), vol. 19, No. 5, Mar. 1977, pp. 1358-1360.
Buchalter Michael S.
Caldwell Stephen P.
Haynes James T.
Auton William G.
Eisenzopf Reinhard J.
Mueller Robert W.
Singer Donald J.
The United States of America as represented by the Secretary of
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