Op-Amp Integrator vs. Differentiator: Key Differences

This article compares the integrator op-amp with the differentiator op-amp, highlighting the key differences between these operational amplifier circuits.

Integrator Op-Amp

The operational amplifier functions as an integrator when the feedback resistor is replaced with a capacitor (C), while the input resistor remains unchanged.

Figure 1: Inverting Op-Amp Integrator Circuit

The equation for the integrator op-amp is:

$V_{out} = -\frac{1}{RC} \int V_{in} \, dt$

Where:

• $V_{in}$ is the input voltage to the op-amp.
• $V_{out}$ is the output voltage from the op-amp.

Differentiator Op-Amp

The operational amplifier functions as a differentiator when the input resistor is replaced with a capacitor (C), while the feedback resistor remains unchanged.

Figure 2: Inverting Op-Amp Differentiator Circuit

The equation for the differentiator op-amp is:

$V_{out} = -RC \frac{dV_{in}}{dt}$

Where:

• $V_{in}$ is the input voltage to the op-amp.
• $V_{out}$ is the output voltage from the op-amp.