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CLOSED-LOOP OPERATION OF AN OPERATIONAL AMPLIFIER - 14180_110
Figure 3-16.Noninverting configuration

Neets Module 08-Introduction to Amplifiers
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3-23 Since no current flows into or out of the inverting input of the operational amplifier, any current reaching point A from R1 must flow out of point A through R2. Therefore, the input current (Iin) and the feedback current (Ifdbk) must be equal. Now we can develop a mathematical relationship between the input and output signals and R1 and R2. Mathematically: If you multiply both sides of the equation by R1: If you divide both sides of the equation by Eout: By inverting both sides of the equation: You should recall that the voltage gain of a stage is defined as the output voltage divided by the input voltage: Therefore, the voltage gain of the inverting configuration of the operational amplifier is expressed by the equation: (As stated earlier, the minus sign indicates that the output signal is 180 degrees out of phase with the input signal.) Noninverting Configuration Figure 3-16 shows a noninverting configuration using an operational amplifier. The input signal (Ein) is applied directly to the noninverting (+) input of the operational amplifier. Feedback is provided by






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