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Original question:

LM7171: Need suggested method for adjusting the offset voltage of LM7171 to less than 50uV.

THS4011: How is the input offset voltage related to frequency?

PAVITHRA JOSHI
Prodigy 210 points
Part Number: THS4011

Hi,

I found the below statement in datasheet of THS4011.

Need help in understanding how the input offset voltage decreases with increasing frequency.

For THS4011, will the offset voltage reduce to uV range at what range of frequency?

Thanks

Pavithra Joshi

  • 0
    Guru 47485 points

    You are mis-interpreting that odd statement. 

    They were saying that, for a high speed amplifier which at that time rarely had good offset, it does pretty good.But, if you need better, they added an offset nulling adjustment - that was silly, that adjustment does nothing for drift and is rarely included in more modern devices. 

    Do not interpret this to say the offset gets better with frequency. That is not the case

  • 0 in reply to Michael Steffes
    Prodigy 210 points

    Hi Michael,

    With the offset adjustment for THS4011 which has an input offset voltage of 6mV(max) , 1mV (typ). 

    What is the minimum offset voltage that can be achieved by adjusting using the NULL piins.

    Thanks

    Pavithra Joshi 

  • 0 in reply to PAVITHRA JOSHI
    Guru 47485 points

    Well probably to 0 initially, but, as I said, this type of null does not help drift, so it will move off immediately with temp shifts - this was an old approach no one uses anymore.