I am wondering is it possible to design a differential (or instrumentation) amplifier that will operate from single supply?
I have a 2Vp-p and 0.2Vp-p sine wave signals that need to go thru the differential amplifier. They both swing positive and negative.
But currently for this project I have only positive power supply. I can add an inverting converter if necessary but would like to know if I can reduce the costs.
If it is possible, could you please show an example.
Thanks
Best Answer
Getting the input of a amplifier to work outside its supply voltage range is difficult, but there are possible ways around this:
Both these schemes will add some offset error. Everything is a tradeoff.
If you already have something that produces a regular clock, a capacitive charge pump can be as easy as a couple of diodes and caps. I have a few times used the clock output of a microcontroller for this purspose, although then I buffered it with two transistors making a push-pull emitter follower.