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Dual FET-input operational amplifier

TL072 Working Principle

Learn how TL072 works with an illustrated explanation and practical readings.

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TL072 at a glance

Follow the labeled connections and functional stages

TL072 working principle: illustrated functional stages, basic circuit and connections
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How it works

3 stages · Explore one step at a time

Step 1 / 3

Compare each input pair

The FET input stage draws very little bias current at room temperature. Source resistance, board leakage and temperature still affect the input error.

Step 2 / 3

Set two different gains

Channel A uses 20 kΩ feedback and 10 kΩ to the 0 V midpoint, giving a gain of three. Channel B directly feeds its output back to its negative input, giving unity gain.

Step 3 / 3

Check headroom and speed

With a 0.50 V input, the ideal outputs are 1.50 V and 0.50 V. Real output also depends on input offset, resistor accuracy, loading, noise and signal frequency.

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