The goal ofputting "systems on a chip" has been a difficultchallenge that is only recently beginning to be met. Since the world is "analog"putting systems on achip requires putting analog interfaces on the samechip as digital processing functions. Since some processing functions are accomplished more efficiently in analog cir- cuitry, chips with a large amountofanalog and digital circuitry are beingdesigned. Whethera small amountor analog circuitryiscombined with varying amounts ofdig- ital circuitry or the other way around, theproblems encountered in marrying analog and digital...