Output buffer offset voltage

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borges

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Joined 2003
Hi,

I'm building an audio DAC and didn't think too much about output offset before actually turning the power on and measuring it. My bad!

I use passive IV conversion and therefore need quite a bit of gain. A +-2mV spread of opamp input-referred offset voltage gets amplified quite a bit, so the output offset voltage varies a lot.

What should I do?
- Offset pots on each channel? (=noise from reference source and expensive layout with multiple pots)

- AC coupling (don't like big caps and hi-pass filters)

- DC feedback servo

- Never mind, amplifiers are AC coupled

- What opamps are recomended by you guys for low offset?


Greetings,

Børge
 
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