Why is it that real differential amplifiers offer only single-side outputs?

crutschow

Joined Mar 14, 2008
27,930
You can buy differential input and output amplifiers. They are often used as buffers for high speed differential input ADCs.
Most have a single-ended output because most applications only want/need a single-ended signal from the differential input, such as most op amps.
 

joeyd999

Joined Jun 6, 2011
4,477
In the textbook, it goes over calculating double-sided and single-sided voltage gains and then states that only one output is available for real-world use but does not state why. Does anyone know the reason?

https://imgur.com/fCiGpfU
Actually, both sides are available, and produce signals of equal magnitude but 180° out of phase.

Some multistage diffi-amps use both legs as outputs to drive the next stage.

Ultimately, a single output signal must be generated -- and this would be taken from one leg.
 
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