Methods and apparatus for frequency response analysis

Details Methods and apparatus for frequency response analysis Methods and apparatus for frequency response analysis

1988-02-08

1989-09-19

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 77R, 324 57R, 324 58A, G01R 2314

Patent

active

048684945

ABSTRACT:
In a frequency response analyser for operation at high frequencies a signal of frequency F for application to a system under test (15) is generated from a frequency synthesizer (11) capable of operation only at a relatively lower frequency F/K by generating a first signal (19) of frequency at the relatively lower frequency F/K by generating a second signal 104 at the relatively higher frequency (f+F) and generating a third signal (at 114) or F(1--1/K). The second signal is applied to the system under test and an output signal (at 16) derived therefrom. The output is multiplied by the third signal to provide a product signal, and the product signal is analyzed with respect to first signal by means of a correlator 14. The present invention overcomes the limitation in maximum testing frequency imposed by the frequency synthesizers of prior art frequency response analyzers.

REFERENCES:
patent: 3968427 (1976-07-01), Sharrit
patent: 3986113 (1976-10-01), Vifian
patent: 4048559 (1977-09-01), Miedema
patent: 4219770 (1980-08-01), Weinert
patent: 4274047 (1981-06-01), Hecken
patent: 4510440 (1985-04-01), Ryder

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