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We can think of R1 as an infinite resistor -- we don't have any connection to ground at all. This arrangement is called an Op-Amp Follower, or Buffer. The buffer has an output that exactly mirrors the input assuming it's within range of the voltage rails , so it looks kind of useless at first. However, the buffer is an extremely useful circuit, since it helps to solve many impedance issues.
The input impedance of the op-amp buffer is very high: close to infinity. And the output impedance is very low: just a few ohms. As shown in Fig. Due to this negative feedback, the op-amp operates in the linear region. Negative Voltage Feedback in the Non-Inverting op-amp configuration Derivation of Closed Loop Voltage Gain of the non-inverting op-amp Configuration Here, it has been assumed that the op-amp is ideal op-amp, and no current is flowing into the op-amp terminals.
As shown in figure 2, the fraction of output voltage Vx is given as feedback to the input. That means the voltage at the inverting and the non-inverting input terminals will be the same. Moreover, the input impedance of the non-inverting op-amp is very high compared to inverting op-amp.
Ideally, it is infinite, because, for the ideal op-amp, no current is flowing into the op-amp terminal And because of the high input impedance, the op-amp can be used as a buffer in many applications. Op-amp as a Buffer As shown in figure 3, the op-amp is used as a buffer.
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