How to convert differential signal to signle-ended signal?

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

 

Are these analog or digital signals? LVDS receiver ICs make
handy differential-to-signal-ended logic-signal converters.

 

If the signals are analog you will have to use a true differential
probe, and proper fixturing.

Regards
Ian

 

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.

 

Allen,

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