aaron_do
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Hi all,
for pipelined ADC MDAC, in the hold phase, the DAC output is subtracted from the input. My question is how do you drive the DAC output? It seems like it requires an opamp with requirements very similar to the actual MDAC. Any thoughts on this?
For instance, it needs to be able to drive the capacitors used in the MDAC, with low noise, and a high resolution representation of the DAC output (actually this last requirement I think depends on part 2 of my question below).
Part 2 of my question is, if you do need an opamp to drive the MDAC output, do we just have one opamp for all stages to share? This seems likely to me, otherwise each individual opamp would need to act precisely the same.
thanks, Aaron
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