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Re: [Discuss-gnuradio] VCO
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From: |
Jean-Michel FRIEDT |
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Subject: |
Re: [Discuss-gnuradio] VCO |
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Date: |
Fri, 18 May 2018 07:45:14 +0200 |
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User-agent: |
Internet Messaging Program (IMP) H3 (4.3.7) |
I would like to ask about the VCO in GRC. What's the function of the
sensitivity? If I connect a signal source (Saw Tooth) into VCO, and
I want a bandwidth of 2MHz. I only can achieve it by setting the
Sentivity = 2e6 *(2*3.1416) . Can anyone explain the theory behind
this?
may the source be with you:
https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/lib/vco_c_impl.cc
The VCO block generates a sincos output at a rate of
sensitivity/sampling_rate,
so that the phase increments by 2pi (one cycle rotation) every
sampling_rate/sensitivity samples. This is also what is given in
http://www.ece.uvic.ca/~elec350/grc_doc/ar01s02s05.html stating that the
sensitivity is in rad/sec*V.
JM
--
JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe,
25000 Besancon, France
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