Frequency response analysis

Details Frequency response analysis Frequency response analysis

1989-04-28

1990-04-10

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

With auxiliary means to condition stimulus/response signals

324 79R, 324 77B, G01R 2314

Patent

active

049163833

ABSTRACT:
In a frequency response analyzer capable of testing a system under test at a higher frequency F derived from a signal generator providing a relatively higher frequency F/K. A reference signal of frequency F-C is supplied to a mixer where it is multiplied with the return signal of frequency F to provide a fixed frequency output C. An analyzing portion of the frequency response analyzer is therefore required to operate only at this fixed frequency C and may provide an output in any suitable form, for example displays of magnitude and phase against frequency as F/K is varied. The present invention overcomes the problem of providing a VCO based signal generator capable of operation at very low frequencies.

REFERENCES:
patent: 3445762 (1963-03-01), Wu
patent: 4510440 (1985-04-01), Ryder
patent: 4716363 (1987-12-01), Dukes et al.

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