reference circuit in pipelined adc

[ljy4468]

hi everybody
i've a question about reference in pipelined adc.

In sub-adc there are resistor-string reference circuit.
(In one stage)
and another stage, should I use the same resistor-string reference circuit which is used in first stage??
Or made another reference circuit each stage??

 

[moisiad]

I consider that it is better to share the same resistor chain to all stages, in order to have the same voltage references.

 

[bear7679]

I think if the number of stage in your pipeline ADC is small, you can share the same resistor chain. If the number is large, I think use resister string each stage is better.