how to test rail-to rail amplifier?

Question

how to draw the schematic/ design a test bench to test the rail to rail amplifier

Answer 1

It's fairly simple. Powr it up in a simple, non-inverting (or inverting) configuration and see how far the output swings in both directions. True 'rail-to-rail' doesn't actually exist (since the Vce sat. for the output transistors would have to be 0 volts) but a good amplifier should be within a few tens of millivolts of the rails.

One word of caution: Most 'rail-to-rail' amplifiers get a bit 'squirrely' in that last 150 millivolts or so of their output swing. *Don't* rely on them to be linear there ☺


Doug