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Original question:

OPA1611: Alternative with 20MHz and a closed loop gain of 20dB

Part recommendatoin

Marvien Arcangel
Genius 9965 points
Other Parts Discussed in Thread: OPA846

Hi Team,

A customer is looking for a part with an open-loop gain greater than 20dB or as high as it comes at 20MHz. with low noise of 1nV/RT-HZ  or up to 2nV/RT-HZ.

Can you please help?

Regards,

Marvin

  • 0
    TI__Genius 9850 points

    Hi Marvin,

    We have quite a few amplifiers that might be able to fit the customer's needs but to help give the best recommendations is there any other information you could give. Is their information on the specific application, or more design constraint information like the power supplies they intend to use and a specific range of closed loop gain they are targeting?

    This information would be very helpful.

    Best Regards,

    Ignacio

  • 0 in reply to Ignacio Vazquez Lam1
    TI__Genius 9965 points
    Hi Ignacio,
    The power supply can be from +/-5V up to +/-15V as required and the closed loop gain is 20dB at 20MHz.
    Let me know if you need more information.
    Regards,
    Marvin
  • 0 in reply to Marvien Arcangel
    TI__Genius 9850 points

    Hi Marvin,

    Based off of the information given the customer might consider looking into our OPA846, this is a decompensated amplifier that is stable at +10 V/V and has a closed-loop bandwidth of 400MHz with a +/-5V supply. 

    I filtered amplifiers based off a GBW of 200MHz (10 V/V * 20MHz), a +/-5V supply, and less than 2nV/rtHz, in the order of greatest GBW and I have the TI.com generated list here. The list generated is 30 parts that I recommend looking into beyond the suggested amplifier as different topologies offer different benefits that the customer would be able to consider for their application. I would also like to add that some of our faster amplifiers are decompensated like the one suggested above, which means they require a minimum gain to be stable. This is something to consider as some amplifiers on the list have this requirement, therefore might not work at 10 V/V. I would also consider the frequency response these amplifiers have at 10 V/V as some amplifiers show peaking when configured at this gain while others show a flatter response. These are all tradeoffs that the customer can consider for their application. 

    Best Regards,

    Ignacio