Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-08-30
1977-09-13
Griffin, Robert L.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 57H, 324 57N, 324 77B, 324 83Q, 324 85, 325435, H04B 1700
Patent
active
040485684
ABSTRACT:
It is desirable to be able to measure the FM noise spectra of signals whose arrier power is less than the minimum power level at which a direct non-amplified analyzer can operate satisfactorily. Generally a carrier less than approximately + 2 dbm would require analysis by a very low power measuring system.
In the superheterodyne analyzer the discrimination process for a high frequency input signal is accomplished at a suitable intermediate frequency. A single set of discrimination equipment is utilized in the measurement of a wide carrier frequency range of input signals using relatively narrow band intermediate frequency hardware to optimize the analysis function. This provides a means for measuring frequencies from 4 GHz to 8 GHz or from 2 MHz to 2 GHz for example, with high accuracy and sensitivity, while using the same intermediate frequency hardware limited to operational bandwidths of a few MHz. A balanced phase detector, power dividers, attenuators coupled with an optimum length transmission line and balanced mixing of signal and reference signals at an IF level coupled with frequency translation provide frequency discrimination over a wide carrier frequency range.
REFERENCES:
patent: 2964622 (1960-12-01), Fire
patent: 3079563 (1963-02-01), Marsh et al.
patent: 3913013 (1975-10-01), Barley et al.
Ashley James R.
Barley Thomas A.
Hammond Raiford L.
Rast, Jr. Gustaf J.
Bookbinder Marc E.
Bush Freddie M.
Edelberg Nathan
Gibson Robert P.
Griffin Robert L.
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