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Slew rate X telecoms

Discussion in 'Electronic Design' started by Roger, Jun 21, 2006.

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  1. Roger

    Roger Guest

    Audio quality in standard telecom cct's is limited by the CTITT codec,
    so I would assume that there is a rule of thumb slew rate for 0dB
    signals to get "irrelevant" 2nd harmonic distortion.

    So is it possible to have a constant for any signal level? i.e. a
    constant you can multiply by pk-pk signal to get the required slew
    rate?

    I get as far as saying dv/dt=cos(pi)=-1, i.e. theoretically vertical,
    how do I translate slew rate limit into THD? And what would be an
    acceptable value of THD for telecoms?

    I suppose to find the THD for a given slew I would need to integrate
    between limits at the point were dv/dt of a sin=slew rate of the
    cct......but getting from that concept to the constant I am looking for
    is way beyond me ;-)
     
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