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Dual FET-input audio operational amplifier

OPA2134 Working Principle

Learn how OPA2134 works with an illustrated explanation and practical readings.

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OPA2134 at a glance

Follow the labeled connections and functional stages

OPA2134 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 true FET input stage provides high input impedance and low room-temperature bias current. Source impedance, board contamination and rising temperature can still create measurable errors.

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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