OP467

Anonymous
Anonymous

Hello,

I am trying to build an amplifier for quite a wide range of frequencies (40Hz -  200 kHz).  I wanted to use OP467 since it has quite a wide bandwidth. So, using one section of OP467, I built an inverting amplifier with a gain of 10. However, I am starting to observe a decline in gain at about 40 kHz.  At 100 kHz, the attenuation of gain is about 60%.  Is there anything that I am missing or these results are reasonable?

Thanks,

Anton.

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  • 0
    •  Analog Employees 
    on Apr 28, 2019 2:12 PM

    Hi Anton,

    Looking at the OP467's TPC in the datasheet, you should not have any problem with the gain at 100kHz signal.
    Though you mentioned that you're only using one section of OP467, did you configure the unused amplifiers to unity-gain follower with the non-inverting pin connected to ground (I'm assuming your amplifier is configured in dual supply scheme)? These unused amplifiers may cause cross-talk to the one you're using. 
    If you've done this, please provide your schematic diagram so that we'll be able to help you further.

    Thanks.

    Best Regards,
    Dann

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  • 0
    •  Analog Employees 
    on Apr 28, 2019 2:12 PM

    Hi Anton,

    Looking at the OP467's TPC in the datasheet, you should not have any problem with the gain at 100kHz signal.
    Though you mentioned that you're only using one section of OP467, did you configure the unused amplifiers to unity-gain follower with the non-inverting pin connected to ground (I'm assuming your amplifier is configured in dual supply scheme)? These unused amplifiers may cause cross-talk to the one you're using. 
    If you've done this, please provide your schematic diagram so that we'll be able to help you further.

    Thanks.

    Best Regards,
    Dann

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