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IP2 measurement, single tone - RF Cafe Forums
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| Y-11Bike
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Post subject: IP2 measurement, single tone
Posted: Sat May 26, 2012 10:33 am
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Joined: Sat May 26, 2012
10:31 am
Posts: 1 |
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Does anyone have a reliable technique to measure
IP2 using a single input tone ?
I only have
one signal generator available, and all the technical
notes I've read seem overly cryptic.
Thanks,
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Kirt Blattenberger
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Post subject: Re: IP2 measurement, single tone
Posted: Sun May 27, 2012 11:13 am
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| Site Admin |
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Joined: Sun Aug 03, 2003
2:02 pm
Posts: 476
Location: Erie, PA
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Greetings Y-11Bike:
Unfortunately, its full
name, the 2-tone, 2nd-order intercept point, requires
a second tone in order to do the measurement.
_________________ - Kirt Blattenberger
RF Cafe Progenitor & Webmaster
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SunshineDesign |
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Post subject: Re: IP2 measurement, single tone
Posted: Thu Aug 16, 2012 2:44 pm
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Joined: Sat Nov 08, 2008
11:35 pm
Posts: 30
Location: Ramona, CA
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While there is no way to exactly measure IMD without
at least 2 tones, there is a technique that gives
some measrue of IMD performance and that is Noise
Power Ratio. Take a white noise source and filter
a narrow bandwidth with a very deep selectivity
filter. When this signal goes thru the device under
test, the backfill noise power into the notch is
representative of Infinite tone IMD. White noise
can be thought of as infinite frequency signals
and the IMD of this noise is what spills over into
the notch. For it to work, the notch filter must
have reject selectivity greater than the IMD performance
expected. While this is not a single tone generator,
it is a single source (Noise Diode).
_________________
Sunshine Design Engineering
Services
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Posted 11/12/2012
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