This letter proposes a Ku-band voltage-controlled oscillator (VCO) equipped with low-dropout (LDO) based amplitude control, fabricated in the 0.18μm CMOS process. The LDO regulator combines with the voltage distribution network to generate a stable supply of 1.8V and an internal bias voltage range of 0.64−0.72V to the VCO core. The VCO demonstrates an 11.6% tuning range from 15.69GHz to 17.62GHz. The measured phase noise of 17.62GHz carrier frequency is −111.2 dBc/Hz at 1MHz offset frequency while dissipating 3.5mA from 1.8V voltage regulator output, yielding a Figure-of-Merit of 189.4. The whole chip size is 0.6 mm², including testing pads.