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# What types of amplifier circuits can be configured using an op-amp?

In the most basic circuit, op-amps are used as voltage amplifiers, which can be divided into noninverting and inverting amplifiers. In addition, op-amps are also commonly used as voltage followers (also called buffer amplifiers or simply buffers). Op-amps are also used in many other configurations, including differential amplifiers and integrator circuits. Figure 1 shows an example of a noninverting amplifier. Both R1 and R2 are external resistors. In this circuit, negative feedback is used to apply a portion of the output voltage to the inverting input via R1 and R2. The closed-loop gain*1 (GV) of this circuit is expressed only with R1 and R2. The ease of gain setting is one of the advantages of an op-amp.

Figure 2 shows a voltage follower. In the voltage follower, R1 is infinite and R2 is equal to zero. As a result, all of the output voltage is applied to the inverting input. Because V+ and V- are virtually shorted*2, the output voltage is equal to the input voltage.

A voltage follower is commonly used as a buffer since it is useful for impedance conversion because of low output impedance.

Figure 3 shows an inverting amplifier. R1 and R2 are external resistors. As is the case with a noninverting amplifier, an inverting amplifier uses negative feedback. Therefore, the closed-loop gain of the inverting amplifier can be calculated with a simple equation shown in Figure 3. Figure 1 Noninverting amplifier Figure 2 Voltage follower Figure 3 Inverting amplifier

Toshiba provides an extensive lineup of op-amps. To view a list of op-amps, click the following link:
Also see the application notes on op-amps:
·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.