Both the inverting amplifier and non-inverting amplifier use negative feedback. Both provide gain. But one inverts the signal while the other does not. How to know which one to use? Are there applications where only one of the two can be used (provides both positive and negative supplies exist)?
Is it true that single supply op amp can only create non-inverting amplifier?
Answer
There are a couple reasons (at least) for choosing a particular configuration:
If you need a high input impedance, then you are forced into a non-inverting configuration. This is commonly required in a buffering situation. An inverting configuration has an input impedance equal to the input resistor which may load the source circuit.
If you need a summing amplifier, then inverting is the way to go as the inverting input is the summing junction.
Is it true that single supply op amp can only create non-inverting amplifier?
No. With a DC offset (on the non-inverting input) you can have an inverting configuration although the input signal will need to be ac coupled under most circumstances.
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