This paper presents a new family of logic gates for low energy computing using pulsed power CMOS logic. The logic gates use the principles of adiabatic-switching and results show that in typical cases 90% of the energy can be recovered with operating frequency around 1 MHz. Constant capacitance condition is enforced in our designs so that signals' energy can be efficiently recycled in the chip. We also present a detailed analysis and modeling of energy dissipation in adiabatic circuits. The models were experimentally validated using the circuit simulator SPICE. A simplified version of adiabatic logic with simplicity comparable to static CMOS circuits is also presented. For a 2/spl times/2 multiplier using this type of logic, 60% of energy can be saved over static CMOS case at 20 MHz and there is 35% less energy consumption at 100 MHz.