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Op-Amp Part Selection

Other Parts Discussed in Thread: LM6171, LM7171

Hello E2E Experts,

Good day.

Thank you in advance.

I have been searching for an amplifier for my setup and I was told that an operational amplifier is what I'm looking for.

I need the amplifier to amply pulses up to ~25-30V with a pulse length of 200nm to 1ms.

The lower pulse length limit is a must while the upper limit is not.

I think you would also need to know that my output has a maximum voltage of 5V DC. I would need the pulse amplified to have a 20V ppV, which is a square pulse from 0-20V and not -10-20V

Regards,

CSC

  • Are these pulses analog or digital, i.e., does the output voltage depend on the input voltage? For digital signals, you should use a comparator.

    You have mentioned three different voltages (25-30 V, 5 V, 20 V). Please clarify which one is to be used.

  • Hello Clemens,

    Good day.

    I would still like a recommendation on your end for an amplifier that suits my setup the best. To summarize everything we have talked about previously, I need analog pulses with the output gain controlled by the input. We have a pulse generator that has a maximum output of 5V DC and that is what we are trying to amplify, up to a maximum 30V ideally. However, I would like to know all of my options so I would consider anything that could go up to 25V. The amplified voltage should hold from 200ns up to 1ms ideally. The upper limit of the pulse length is not a hard limit as we have other tools capable of generating that pulse while the minimum pulse length must be met. There was also confusion you brought up with all of the voltages I mentioned. 20V 200ns is just a typical pulse I would like to use for my experiments and I gave that just as an example.

    Regards,

    CSC

  • To get proper pulses, you need an amplifier with a high slew rate. Assuming that you want the edges to be no longer than 20 ns, you need 1500 V/µs.

    The only 25 V, voltage-feedback amplifiers with such a high slew rate are the LM6171/LM7171.

  • Since these are high speed amplifiers, I will transfer the thread to High Speed Op Amps. 

    All the best,
    Carolina

  • Hello CSC,

    Do you require additional assistance with this thread?  I can discuss with my team if you would like additional information or assistance.

    Best,

    Alec