I often read that op-amps will "do whatever it can (within the limits of their power supply) to make the voltage on the inverting and non-inverting inputs equal." Can an op-amp recognize if the response to its actions are having the opposite of a desired effect and reverse its response?
For example, suppose I have 2v being applied to the non-inverting input, and 1v being applied to the inverting input. The op-amp will start to ramp its output voltage in an attempt to raise the inverting input up to the voltage of the non-inverting input. Suppose that the feedback network negates the output of the op-amp so for example if the op-amp is outputting 2v that gets converted to -2v before being fed back to the inverting input.
Would the op-amp recognize this reversed response and start dropping its voltage in order to get the two outputs to be equal? Or would it just peg its output at the positive rail?
Thanks,
For example, suppose I have 2v being applied to the non-inverting input, and 1v being applied to the inverting input. The op-amp will start to ramp its output voltage in an attempt to raise the inverting input up to the voltage of the non-inverting input. Suppose that the feedback network negates the output of the op-amp so for example if the op-amp is outputting 2v that gets converted to -2v before being fed back to the inverting input.
Would the op-amp recognize this reversed response and start dropping its voltage in order to get the two outputs to be equal? Or would it just peg its output at the positive rail?
Thanks,