Modulation index for ASK modulation - RF Cafe Forums
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Post subject: Modulation index for ASK modulation Posted: Mon Jul 10, 2006 7:44 am
Joined: Mon Jun 27, 2005 2:02 pm
Can anyone elaborate about the modulation index for ASK modulation. I tried to look for it in Google but couldn't find out a clear information.
Thank you all.
Post subject: ASK modulation indexPosted: Mon Jul 10, 2006 11:43 am
Joined: Wed Feb 22, 2006 3:51 pm
The modulation index for AM (and ASK is a subset of AM) is more often called the modulation percentage, but given as a straight number.
MI = (Vmax - Vcarrier)/Vcarrier
MI = (Vmax - Vmin)/(Vmax + Vmin)
So the most common form of ASK, On-Off Keying, has an index of 1.