Frequency response analyser with multiplying digital to analogue

Details Frequency response analyser with multiplying digital to analogue Frequency response analyser with multiplying digital to analogue

1987-11-16

1989-09-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 79D, 364485, G01R 2314

Patent

active

048684872

ABSTRACT:
In apparatus for performing frequency response analysis of a system under test to establish response coefficients at various frequencies, a look up Read Only Memory is sequentially addressed to give a driving signal. The signal received from a system under test is fed to the analogue input of a multiplying digital to analogue converter, the digital input being fed from a Read Only Memory, storing values of a reference waveform (e.g., sin wt), by which the received signal is multiplied. The integration period of the multiplying digital to analogue converter is selected such that unwanted multiplication products integrate out, leaving the response coefficient at the reference frequency. For speed, a second channel may be used to establish the orthogonal coefficient. Methods are proposed so that the arrangement operates with single or two quadrant multiplying digital to analogue converters and to select harmonic coefficients.

REFERENCES:
patent: 3526832 (1970-09-01), Post
patent: 3808526 (1974-04-01), Jackson
patent: 4322806 (1982-03-01), Allison
patent: 4584650 (1986-04-01), Kozuch
patent: 4795963 (1989-01-01), Ueno et al.

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