# What structures do arithmetic circuits that use amplifiers have?

Latest Updated:08/01/2009

## Question:

What sorts of configurations do arithmetic circuits that use operational amplifiers have?

## Answer:

The configuration of each type of arithmetic circuit is as follows:

This circuit outputs the sum of the input voltages. (The output voltage is within the rated range.)

This circuit outputs the difference between the input voltages.

This circuit outputs the derivative of the input voltages.

Differential circuits are mainly used as active high pass filters, but the gain increases in proportion to the frequency, and the high frequency noise component is also amplified. Therefore, an incomplete differential circuit is often used to smooth out the rises of the output.

An incomplete differential circuit shows integration characteristics for the high frequency component.

This circuit outputs the integral of the input voltages.

Integration circuits are mainly used as active low pass filters.

**(1) Adder circuit**This circuit outputs the sum of the input voltages. (The output voltage is within the rated range.)

**(2) Subtractor circuit (differential amplifier circuit)**This circuit outputs the difference between the input voltages.

**(3) Differential circuit**This circuit outputs the derivative of the input voltages.

Differential circuits are mainly used as active high pass filters, but the gain increases in proportion to the frequency, and the high frequency noise component is also amplified. Therefore, an incomplete differential circuit is often used to smooth out the rises of the output.

An incomplete differential circuit shows integration characteristics for the high frequency component.

**(4) Integration circuit**This circuit outputs the integral of the input voltages.

Integration circuits are mainly used as active low pass filters.

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