Abstract—In this paper, we propose a LC resonator circuit using Hara’s active inductor for adiabatic logic. The proposed circuit consists of four MOS-transistors Colpitts oscillator and an active inductor. This circuit require no inductor and can be produced two-phase sinusoidal clocking. From the simulation results, we show that the proposed circuit was operated as a 10 MHz, 3 V peak-to-peak LC resonant oscillator.