drive amp gain error effects

Fred L Skalka

How does gain error (or max open loop gain) in the unity gain buffer amp drinving the ADC effect the performance in the ADC? Is there a simple way to quantify this?

over 13 years ago

0 Jim Brinkhurst1 over 13 years ago

TI__Mastermind 44680 points

Hi Fred

Are you considering the case of an external buffer amplifier driving an ADC input(s), or the built-in buffer included upstream of the track and hold in certain ADC products?

Thanks,

Jim B

0 Fred L Skalka over 13 years ago in reply to Jim Brinkhurst1

Intellectual 260 points

Using an external amplifier.

0 Hooman Hashemi over 13 years ago in reply to Jim Brinkhurst1

TI__Mastermind 22825 points

Hello,

Open loop gain (or lack thereof) usually manifests itself as increased distortion and / or loss of bandwidth. If the amplifier in question is evaluated for these effects and found to not limit performance, then I do not think its open loop performance needs any further verification or evaluation, especially when used as a buffer.

In most cases, the 2nd order effects having to do with driving the input of the ADC, which could be a complex load, are most likely the factors limiting performance.

Hope this helps.

Regards,

Hooman

0 Fred L Skalka over 13 years ago in reply to Hooman Hashemi

Intellectual 260 points

Thanks Hooman. I think that covers it.

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drive amp gain error effects