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using AD8067 as inverting amplifier

Hi,

I tried to work with AD8067 operational amplifier as inverting amplifier. My input resistance is 12k ohm and feedback resistance is 10k ohm. Now gain should be less than one. I tried to simulate it in LTspice with spice model of AD8067 from analog device website. I got very weird result. The frequency increased and the output is like a beam. I am attaching the circuit and output curve here. Can anyone please help me to solve this problem?

Thank you.

Niloy

attachments.zip
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  • Hi Niloy,

    Sorry for the delayed response.

    With your noise gain less than 1.826 and a signal of 500 kHz, that makes a GBP of 913 kHz and ADA4627-1 (GBP = 19 MHz) can be appropriate for your application. It is a wide bandwidth precision amplifier that features low noise and very low offset. It's typical offset voltage is only 70 uV (130 uV lower than previous part) and a noise of 0.86 uVp-p. Unlike AD8067, it does not have recommended values for RF so you can play with values you want and get the same performance offered by the device. Just take note that ADA4627-1 is not Rail-to-Rail thus care is required to ensure inputs do not exceed the IVR.


    I hope this helps.

    Best Regards,

    Jino

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  • Hi Niloy,

    Sorry for the delayed response.

    With your noise gain less than 1.826 and a signal of 500 kHz, that makes a GBP of 913 kHz and ADA4627-1 (GBP = 19 MHz) can be appropriate for your application. It is a wide bandwidth precision amplifier that features low noise and very low offset. It's typical offset voltage is only 70 uV (130 uV lower than previous part) and a noise of 0.86 uVp-p. Unlike AD8067, it does not have recommended values for RF so you can play with values you want and get the same performance offered by the device. Just take note that ADA4627-1 is not Rail-to-Rail thus care is required to ensure inputs do not exceed the IVR.


    I hope this helps.

    Best Regards,

    Jino

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