Re: How to convert differential signal to signle-ended signal?
- From: LVMarc <LVMarc@xxxxxxx>
- Date: Wed, 11 Apr 2007 10:45:11 -0700
joseph2k wrote:
Allen wrote:Allen,
We are testing some wideband (1GHz-8GHz) differential circuits, but
there is only one channel on our high frequency oscillascope. What
kind of devices can we use to convert the differential signal to
signal-ended signal? Can we use a balun or a power conbiner? Thanks.
Best,
Allen
To correctly measure all parameters you need a two input scope (a 4 input
scope would be even better, have you considered renting one?), additionally
a differential probe will help. Otherwise a balun or a 180 degree combiner
will work for "coarse" measurements.
JKK is spot on. The best way is to use a two channel scope to monitor and then use the math function to "subtract" the two, therby having the scope perform the differential to single ended convesion.
For part of the band (1-3 GHZ) you can use fast op amps to perform the differential to single ended conversion. for the entire 1-8 you also can use a wideband 180 hybrid. this acts like a transformer which canbe used from 1 MC to 1 gC)
best regards,
Marc
.
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