Calculating Power Consumption of Analog Path

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Hi all,

I'm trying to spec out a power supply for my project and I'm having conceptual trouble trying to estimate the power consumption of my analog electronics.

Say I had three Op amps one after another arranged in a non inverting configuration with the final amp driving 1A(rms).

So far I have taken into consideration the Quiescent current of each stage but I'm having trouble with the dynamic power. Are the first two stages actually driving any current since they are connected directly to the non-inverting terminal of the next stage? Would the total current drawn from my supply be the sum of the three supply currents and the 1A(rms) from the final output?

Anything else I'm missing?

Thanks in advance!
 

If you've got the output of one opamp driving the EXTREMELY HIGH INPUT IMPEDANCE of the next op amp, how much current does that output need to supply? Just about nothing, dynamic or otherwise. If you've got feedback resistors, those will also draw some current, as will capacitors (dynamically!). Without seeing a schematic there's no way we can provide any more information.
 

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