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Modulation index for ASK modulation - RF Cafe Forums
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IR
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
Hello,
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
Top
fred47
Post subject: ASK modulation
indexPosted: Mon Jul 10, 2006 11:43 am
General
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!
Fred
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