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Also known as unity gain, an isolation amplifier provides isolation from one fraction of the circuit to another. The primary function of this amplifier is to maximize the signal. It is used to give an electrical safety battier along with isolation. An isolation amplifier or isolator can also be used to protect the patients from the outflow of current. They can also crack electrical signal’s ohmic continuity among I/P and O/P and isolated power supply can be provided for both of them. Let’s know more about isolation amplifier:

What is Isolation Amplifier?

An amplifier that does not have any conductive contact among I/P and O/P is known as an isolation amplifier. It also provides ohmic isolation among the input and output terminals of the amplifier. It must have less leakage and a high dielectric breakdown voltage. The typical resistor and capacitor value of the amplifier should have 10 Tera Ohms and the capacitor should have 10 picofarads.

Top Features of Isolation Amplifier

The primary features of these amplifiers are

  • Voltage supply
  • Current supply
  • Operating Temperature

The voltage supply can be used to describe the range of voltage source, whereas the current supply is the amount of current which can be taken from the source of power supply. On the other hand, the operating temperature is the particular value of ambient temperature.

Isolation Amplifier

All these amplifiers use different methods to reduce distortion and huge signal non-linearity using a LOC with the aim to enhance the amplifier’s linearity over an exact range of the signal. This LOC or linear optocoupler consists of input LED connected to 2- photodiodes which feed the input and output circuitry.

Applications of Isolation Amplifier

They can be used in applications, including signal conditioning. It may use several bipolar, CMOS & complementary bipolar amplifiers such as chopper, isolation, and instrumentation amplifiers. When it comes to selecting an isolator for different applications, the supply voltage characteristics of an amplifier should be considered.

Design Methods of Isolation Amplifier

There are three types of design methods, including

  • Transformer Isolation
  • Optical Isolation
  • Capacitive Isolation


It uses two signals like PWM or frequency modulated. It includes 20 KHz oscillator, filter, rectifier, and transformer that give supply to the isolated stage. The main benefits of these amplifiers include high CMRR, linearity, and accuracy. They can be used in medical, nuclear, and industrial industries.


Here, the patient circuit is input, and the output circuit can be formed by a phototransistor. They are operated with a battery. I/p circuit changes the signal into light, whereas the o/p changes the light back to the signal. The main advantages of optical are:

  • It improves the safety of the patient
  • It connects optically without modulator otherwise demodulator
  • It can be used to get amplitude and original frequency

Some of the applications of optical are process control in industries, data acquisition, monitoring of the patient, measurement of biomedical, test equipment, interface element, controlling of SCR, and so on.


It can be used to send signals across a differential capacitive barrier. It includes both modulators and demodulators. Using capacitive, the input voltage can be changed to a relative charge over the switched capacitor. Some of the advantages of capacitive are:

  • It can be used to remove ripple noises
  • It can be used for analog systems
  • It gives high immunity to magnetic noises
  • It can be used to avoid noise

Some of the applications are data acquisition, interface element, monitoring of the patient, ECG, and EEG.

Single conditioners and isolation amplifiers can be purchased easily from the right service provider.  All you need to do is to find the trusted service provider and place an order for signal conditioners and isolated amplifiers.

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