In a 65nm pixel readout chip, keeping the analog front end on the substrate while isolating only digital circuits in a deep N-well provides better analog-digital noise isolation than double isolation.
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Measured Effectiveness of Deep N-well Substrate Isolation in a 65nm Pixel Readout Chip Prototype
In a 65nm pixel readout chip, keeping the analog front end on the substrate while isolating only digital circuits in a deep N-well provides better analog-digital noise isolation than double isolation.