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Differential Output vs. Single Ended output

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pyrch.michael

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I am designing a mixer that produces a differential output based on differential inputs from an LO and RF. My question is what is a differential input/output signal? The differential outputs are generally labelled IF+ and IF-. Does this mean the signals are just inverse of the other? If this is true why cant I just use one of the differential outputs as opposed to converting to single-ended?
I can supply a schematic of my circuit if requested but my question is pretty general and applies to just what the difference between differential output and single-ended output.
 

single ended ... all channels single ended share the same common ... the voltage is measured between each channel wire and the shared common wire
differential ... each differential channel is composed by two wires... the voltage is measured between those two wires..
 

When converting from single ended to differential how does the amplitude, phase, and frequency of one of the differential signals compare to the single ended? For instance, if I take measurements from only one of the differential signals compared to ground, is the amplitude, phase, and frequency the same or different by a constant?
 

They should be the same. I don't see much point in generating a balanced signal if you're going to convert it straight back to single-ended, unless it's going to be sent some distance through a cable and you're concerned about interference. If you're using a multiplier chip, that probably gives you balanced output anyway whether you want it or not. You don't have to use IF+ and IF- though, you could just use one of them.
 

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