This document discusses the design and implementation of combinational circuits using reversible gates to reduce power consumption. It begins with an introduction to reversible logic and discusses how reversible gates can be used to design logic circuits without information loss and zero energy dissipation. Several reversible gates are described including NOT, Feynman, Toffoli and Fredkin gates. The document then presents the design of a 2x4 decoder and 4x16 decoder using reversible gates like Peres, TR and CNOT gates. Simulation results demonstrating the outputs of the decoders are shown. Finally, a comparative study of reversible decoders in terms of quantum cost and garbage outputs is discussed. The conclusion states that reversible logic allows minimizing fan-out limitations and quantum cost in combinational