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how to clamp the output voltage of opamp

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sumitj

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opamp output voltage clamp

Hi

I have designed an opamp with 5V power supply. when non inverting input is higher than inverting input the output reaches close to positive rail i.e. 5v. I want to design the opmap ( or use some other circuitry) such that the max output voltage doesn't exceed 2.5V. constraints are => power supply can't be changed and also gain of opamp should be greater than 70db.

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lavitaebelle

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op amp clamp

You need to use negative feedback. With opamp gain>70dB. Even the slightest difference (mV) will send the output to rails due to the high gain. So some form of feedback will get you the desired output level.
 

lambtron

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Can you simply use a 2:1 voltage divider at the amplifier output?
 

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