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Non investing operational amplifier ppt slides

It is the value of these two resistors that govern the gain of the operational amplifier circuit. The calculation hinges around the fact that the voltage at both inputs is the same. This arises from the fact that the gain of the amplifier is exceedingly high.

If the output of the circuit remains within the supply rails of the amplifier, then the output voltage divided by the gain means that there is virtually no difference between the two inputs. The voltage at the inverting input is formed from a potential divider consisting of R1 and R2, and as the voltage at both inputs is the same, the voltage at the inverting input must be the same as that at the non-inverting input. For most circuit applications this can be completely ignored. This is a significant difference to the inverting configuration of an operational amplifier circuit which provided only a relatively low impedance dependent upon the value of the input resistor.

As long as the op-amp is operating in the linear region not saturated, positively or negatively , the open-loop voltage gain approaches infinity and a virtual short exists between two input terminals. Because of the virtual short, the inverting input voltage follows the non-inverting input voltage.

If the non-inverting input voltage increases or decreases, the inverting input voltage immediately increases or decreases to the same value. In other words, the gain of a voltage follower circuit is unity. The output of the op-amp is directly connected to the inverting input terminal, and the input voltage is applied at the non-inverting input terminal. The voltage follower, like a non-inverting amplifier, has very high input impedance and very low output impedance.

The circuit diagram of a voltage follower is shown in the figure below. It can be seen that the above configuration is the same as the non-inverting amplifier circuit, with the exception that there are no resistors used. So, the gain of the voltage follower will be equal to 1. The voltage follower or unity gain buffer circuit is commonly used to isolate different circuits, i.

In practice, the output voltage of a voltage follower will not be exactly equal to the input voltage applied and there will be a slight difference. This difference is due to the high internal voltage gain of the op-amp. NOTE: The open-loop voltage gain of an op-amp is infinite and the closed-loop voltage gain of the voltage follower is unity.

This implies that by carefully selecting feedback components, we can accurately control the gain of a non-inverting amplifier. These nodes are not shown in the above image. The voltage gain is always greater than one. The voltage gain is positive, indicating that for AC input, the output is in-phase with the input signal and for DC input, the output polarity is the same as the input polarity.

The voltage gain of the non-inverting op-amp depends only on the resistor values and is independent of the open-loop gain of the op-amp. The desired voltage gain can be obtained by choosing the appropriate values of the resistors.

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Operational Amplifier: Non-Inverting Op-Amp and Op-Amp as Buffer (Op-Amp as Voltage Follower)

• Operational Amplifiers are used with negative feedback • Feedback is a way to return a portion of the output of an amplifier to the input Non-inverting Amp 1. First check: negative feedback? 2. Next apply, summing point constraint 3. Use circuit analysis +--v o +--R L R 2 R 1 +--v i +--v f i o I in = 0 +-in 1 12 21 2 11 0; 1. Jan 07,  · Views Download Presentation. Operational Amplifier. Operational Amplifier, also called as an Op-Amp, is an integrated circuit, which can be used to perform . AdOver 5 Million Electronic Parts from Leading Manufacturer Brands. Same Day Shipping! Over 5 Million Parts Available Online. $35 Overnight Ship on All Orders. Order Now!