Mixed-signal design in deep submicron digital CMOS technology

This paper illustrates the problems arising when designing accurate analog-digital interfaces to be integrated into the same chip together with a digital processor. Generation of digital disturbs, propagation through the substrate and effects on analog devices are considered, with a particular emphasis on integrated circuits realized on heavily-doped substrate, where traditional shielding is less effective. Techniques to reduce analog-digital crosstalk are reviewed and discussed. Experimental results on a test chip are presented to validate the modeling approach.