LM741

SNOSC25D – MAY 1998 – REVISED OCTOBER 2015

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7.4 Device Functional Modes

7.4.1 Open-Loop Amplifier

The LM741 can be operated in an open-loop configuration. The magnitude of the open-loop gain is typically large

thus for a small difference between the noninverting and inverting input terminals, the amplifier output will be

driven near the supply voltage. Without negative feedback, the LM741 can act as a comparator. If the inverting

input is held at 0 V, and the input voltage applied to the noninverting input is positive, the output will be positive.

If the input voltage applied to the noninverting input is negative, the output will be negative.

7.4.2 Closed-Loop Amplifier

In a closed-loop configuration, negative feedback is used by applying a portion of the output voltage to the

inverting input. Unlike the open-loop configuration, closed loop feedback reduces the gain of the circuit. The

overall gain and response of the circuit is determined by the feedback network rather than the operational

amplifier characteristics. The response of the operational amplifier circuit is characterized by the transfer function.

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