Abstract: A new quadrature voltage-controlled oscillator (QVCO) topology is proposed which consists of two same traditional low voltage-controlled oscillator and it is achieved by using back-gates coupling.The use of back-gates makes quadrature output clocks of voltage-controlled oscillator,reduces power dissipation and phase noise.QVCO of the design use a standard 0.13 μm 1P8M CMOS technology.At a supply voltage of 0.35 V,the total power dissipation is 1.75 mW.The frequence of output clock is 5.34 GHz.The phase noise at 1M Hz offset is-110.5 dBc/Hz,and the FOM (Figure-Of-Merit) is-182.62 dBc/Hz.The tuning range is from 4.92 GHz to 5.34 GHz.It is comparable or better than that of other state-of-the-art QVCO designs operating at much higher supply voltage.