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Theoretical foundations of electrical engineering

# Solving problems in electrical engineering - amplification coefficient of the operational amplifier for inverting and non-inverting connection circuit

The non- inverting switching on of the operational amplifier is a switch in which an input signal comes on the non-inverting input of the control object and the output signal of the amplifier comes on the inverting input through the divider on resistors R1 and R2. In the scheme below the amplification coefficient of the circuit K will be determined by the following expression:

K = Uout/U1 = 1 + R2/R1 In such a scheme, the output signal coincides in phase with the input signal. The voltage amplification may not be less than one. In the limiting case, if the output of the operational amplifier is connected with the inverting input without resistance R2 - K factor is equal to one. Such schemes are referred to as non-inverting repeaters, or just repeaters.

Inverting switching on of the operational amplifier is a switching, in which the non-inverting input of the operational amplifier is connected to the common bus (see below) Amplification coefficient will be determined according to the ratio:

K = Uout/U2 = R2/R1

The output voltage of the amplifier circuit is in the antiphase concerning to the input voltage. Note that the amplification coefficient of the voltage input signal at such switching depends on the ratio of resistors resistance and can be either larger or smaller than one.

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