Frequency response analysis
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United States of America Patent
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Apr 10, 1990
Grant Date -
N/A
app pub date -
Apr 28, 1989
filing date -
Apr 29, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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