Abstract: A method and apparatus for operating logic circuitry with recycled energy. An energy storage device such as an inductor collects energy that used to operate logic circuitry during a first phase of a clock cycle and returns the collected energy back to the circuit during a second phase of the clock cycle. An adaptive circuit senses the collected energy that is returned to the logic circuit during the second phase of the clock cycle to determine whether the energy has fallen below a predetermined limit. If so, the adaptive circuit supplies any needed energy during the second phase of the clock cycle. The inductor that collects energy used to operate the logic circuitry and the inherent capacitance of the logic circuitry form a resonant circuit that operates in synchronism with the clock cycle, the inductor storing energy during the first phase and returning the energy to the inherent capacitance of the logic circuitry during the second phase.