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OP27: OP27

Part Number: OP27

Hello everyone,i have a question about my project.Im doing a digital frequency meter with a schmitt trigger with100mV hysteresis,and i need a DC preamp for it to boost the low frequencies signals 5 times.Since its my first time doing something like that,are there any specific parameters i should look for and whats the best solution a preamp with OPAMP(like OP27) or with transistors.
I know its possibly a stupid question,but i dont find much information online for what i specifically need.

Thank you in advance.

  • Hi Nikolay,

    Don't be too hard on yourself, we all have to start somewhere!

    TI has a great deal of training materials on line that you can access. I suggest having a look at:

    https://www.ti.com/design-resources/design-tools-simulation/analog-circuits/amplifier-circuits.html

    The section on amplifier basics, which has a pull-down to select different amplifier configurations, would be a good place to start. It will link you to the circuits and information on how you go about setting them up for the circuit function you need.

    The OP27 is considered a legacy op amp today, and there are many newer precision op amps that will provide even higher levels of performance. Once you have an idea what levels of performance you need from your circuit, go to TI.com and under products select Precision op amps. There will by lots of choices.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • Hi Nikolay,

    it mainly depends on the input sensitivty and maximum frequency of your frequency meter which is the best solution. Can you give some details on these parameters?

    Kai

  • of course thanks for the replies from you and thanks for the link Thomas,amplifiers are pretty much one of my weak spots when it comes to electronics so ill definitely check it out.So i will measure up to 10Mhz with 1hz resolution with MSP430.Pretty much everything else is done only the pre amp remains.

  • Hi Nikolay,

    and what is the desired sensitivity? 100mVss / 5 = 20mVss?

    Kai

  • Hi Nikolay,

    We really need more information about your application's amplifier requirements. For example you mention amplifying the low frequencies, but also mention 10 MHz. What is the bandwidth requirement for your gain of 5 V/V amplifier? What supplies do you plan to power the op amp with, and what kind of load will the op amp drive? What is the intended input signal voltage range?

    The more information you can provide us the easier it becomes for us to assist you.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • Hi Nikolay,

    We haven't heard from you in a while. We hope the issue was resolved. Closing this thread now. Reply to re-open if you have any additional questions.