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A new current-controlled ring oscillator based on a single-ended rail-to-rail operational transconductance amplifier (OTA) and three simple CMOS inverters is presented in this paper. The tuning frequency of the proposed oscillator is achieved by modifying the OTA DC bias current. Our proposed CMOS oscillator has been simulated under 3.5 V with the 0.8 μm BiCMOS technology from AMS. For a DC bias current between 1 μA to 200 μA, simulation results confirm wide tuning range of 1.2 MHz to 36 MHz. The total circuit area is only 0.05 mm2.