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Circuit For frequency response analyser

Discussion in 'Electronic Design' started by Wayne at NTL, Jan 27, 2004.

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  1. Wayne at NTL

    Wayne at NTL Guest

    Hi

    Has anyone got a circuit for a frequency response analyser .

    cheers
     

  2. .---------------. .----------. .-----------.
    | | | | | |
    | | | | | |
    | Sinewave | | | | True RMS |
    | Generator |----| DUT |----| Voltmeter |
    | | | | | |
    | | | | | |
    | | | | | |
    '---------------' '----------' '-----------'
     
  3. I read in sci.electronics.design that Stefan Heinzmann
    online.com>) about 'Circuit For frequency response analyser', on Tue, 27
    Jan 2004:
    You don't really need a true RMS voltmeter. You measure frequency
    response BELOW maximum output of the DUT, so you are measuring only sine
    waves. The results you get when the DUT is overloaded are of no use at
    all.
     
  4. For 10MHz-1GHz band you can have a look at my "Vector'Soc" transmission
    vectorial network analyzer article published in Demcember 2002 in the
    Circuit Cellar magazine (#149).

    Friendly yours,

    Robert Lacoste - ALCIOM : The mixed signals experts
    http://www.alciom.com
     
  5. Wayne

    Wayne Guest

    What artical was it in. And is this true Stephan Heinzmann. If so could
    you send it either to me or to the New Group?


    regards

    Wayne
     
  6. Hi Wayne,

    Paul is entirely right, provided that the DUT has negligible distortion.
    If not, True RMS is preferred. See for example Langford-Smith "Radio
    Designer's Handbook" 4th Ed. 1953, Chapter 37.3D
     
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