Requested RMS Voltage of modulating signal

Discussion in 'Homework Help' started by dowkwan, Oct 22, 2009.

  1. dowkwan

    Thread Starter New Member

    Oct 15, 2009
    1
    0
    If I use vco max2606 as an fm modulator with frequency sensitivity 10MHz, modulation signal 2.5KHz added to DC tuning V, and Fcarrier = 105MHz.
    How do I find requested RMS voltage of modulating signal?
    Tanx
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    If you really only want the RMS of the 2.5kHz modulating signal

    Vmod_2.5kHz_rms=Vrms_2.5kHz_component

    So if the 2.5kHz signal is a sinusoid of peak magnitude Vm, then its RMS is Vm/√2.

    Perhaps you mean the total modulating signal of V plus the 2.5kHz component in which case

    Vmod_total_rms={V^2+[Vrms_2.5kHz_component]^2}^(1/2)

    If you mean the RMS of the total modulated signal (including carrier) I'll leave that to you ....
     
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