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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

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany

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.

Best regards,

- IR


Post subject: ASK modulation indexPosted: Mon Jul 10, 2006 11:43 am


Joined: Wed Feb 22, 2006 3:51 pm
Posts: 104
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.

Some formulas:
MI = (Vmax - Vcarrier)/Vcarrier
MI = (Vmax - Vmin)/(Vmax + Vmin)

So the most common form of ASK, On-Off Keying, has an index of 1.

Good Luck!

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