In this paper we discuss the state of the art for low
power mixed-signal integrated circuit design. Important
considerations in designing a high performance solution
for a battery powered application include the overall
system power consumption, choice of analog or digital
implementation, appreciation of the efficiency of
alternative system architectures. Also the optimized
implementation of various circuit blocks is considered.

Applications ranging from heart pacemakers to watch circuits are used as examples to illustrate different design techniques which are important in an overall integrated solution.