Positive feedback can be implemented for regeneration. In open-loop configuration (no negative feedback) the op-amp is a comparator. In the rarely used open-loop configuration, the device is said to be saturated when this difference is greater than the supply voltage. Because the output is fed back to the negative input, the device is non-inverting.ĭue to the enormous gain, a small difference between inputs causes the amplifier output to closely approach the supply voltage. Bottom, this op-amp has negative feedback. Top, this op-amp is open-loop because it has no feedback circuit. A type of differential amplifier with high gain, the differential inputs and single output enable this small, inexpensive IC to use negative feedback in a wide variety of applications, in which its gain (hundreds of thousands of times higher than the difference between the two inputs), bandwidth and input and output impedances are set by external circuitry. The operational amplifier (op-amp) has been one of the most successful integrated circuits.
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