Increasing Voltage Compliance with iDAC and Current Mirror

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Anonymous
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 I want to create a 0-100uA constant current pulse with 20V compliance for use as biological stimulation device. I was originally planning to use a VDAC and an external voltage-controled current source to generate the current pulse. I then thought about simply using an iDAC and current mirror, but i've never used a current mirror. I think that the 

   

 

   

Do you guys think the iDAC + current mirror would be a better choice than the VDAC + current converter?

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