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Dual general-purpose operational amplifier

LM1458 Working Principle

Learn how LM1458 works with an illustrated explanation and practical readings.

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LM1458 at a glance

Follow the labeled connections and functional stages

LM1458 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

Each bipolar differential input pair compares the applied signal against its feedback voltage. Input bias currents flowing in source and feedback resistances introduce additional voltage 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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