Abstract—Analog signal processing is fast and can address real world problems. The applications of battery powered analog and mixed mode electronic devices require designing analog circuits to operate at low voltage levels. In this paper, some of the issues facing analog designers in implementing low voltage circuits are discussed, and possible low voltage design techniques are examined. We do not intend to present a review of state-of-the-art technology, but we do describe briefly almost all low voltage design techniques suitable for analog circuit structures along with their merits and demerits.