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Advantages and limitations of operational amplifiers

elecfans | 25/03/2021

Operational amplifier (op amp) is an analog circuit module that uses differential voltage input to generate single-ended voltage output. Operational amplifiers usually have three terminals: two high-impedance input terminals and one low-impedance output terminal. The inverting input is represented by a negative sign (-), and the non-inverting input is represented by a positive sign (+). The role of the operational amplifier is to amplify the voltage difference between the inputs, which is very useful for various analog functions such as signal chain, power supply and control applications.

What is an operational amplifier?

Operational amplifier (op amp) is an analog circuit module that uses differential voltage input to generate single-ended voltage output.

Operational amplifiers usually have three terminals: two high-impedance input terminals and one low-impedance output terminal. The inverting input is represented by a negative sign (-), and the non-inverting input is represented by a positive sign (+). The role of the operational amplifier is to amplify the voltage difference between the inputs, which is very useful for various analog functions such as signal chain, power supply and control applications.

Classification of operational amplifiers

There are four ways to classify op amps:
● A voltage amplifier that absorbs voltage and generates voltage at the output.
● A current amplifier that receives current input and generates current output.
● Transconductance amplifier that converts voltage input to current output.
● Transimpedance amplifier that converts current input to voltage output.

Most operational amplifiers are used for voltage amplification

Operational amplifiers: advantages and limitations

There are many advantages to using an operational amplifier. It usually comes in the form of an IC, it is easy to buy, and there are countless optional performance specifications that can meet all application requirements. It has a wide range of uses and is a key component of many analog applications including filter design, voltage buffers, comparator circuits and many other applications. In addition, most companies provide simulation support, such as PSPICE models, which can be used by designers to verify their operational amplifier designs before building actual designs.

The limitation is that they are analog circuits, which require designers to understand the basic principles of simulation, such as load, frequency response, and stability. It is not uncommon to design a seemingly simple op amp circuit, but oscillations occur in the end. The designer must understand the key parameters discussed in the previous article, and understand how they affect the design, which usually means that the designer must have mid-to-upper level analog design experience.
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