Difference bw (vdd =2V vss =-2V) and (vdd=4v vss=0v)

[mida2621]

Hi, I am a quite newbie in analog IC.
It may sound not smart to ask this kind of question.
But I really wonder what's the difference between (vdd =2V vss =-2V) and (vdd=4v vss=0v) in supply voltage topology.
One of which has advantages over to the other?
Please explain.
Thanks in advance.

 

[LvW]

Like in many - if not in all - cases there are pros and cons for both alternatives
(I assume you are referring to opamp circuits).

Dual supply: Simple design without specific bias circuitry, but two separate supply voltages.
Single supply: only one supply, but additional circuitry for bias and - in most cases - coupling capacitors.