A 67 GHz dual injection quadrature VCO with −182.9 dBc/Hz FOM in 90-nm CMOS

An ultra low phase noise millimeter-wave (mm-wave) quadrature voltage-controlled oscillator (QVCO) is proposed. By introducing an additional coupling path and using uneven sized cross-coupled oscillators with a fully symmetrical layout, the phase noise and the amplitude/phase mismatches are minimized. Implemented in 90-nm CMOS process, the 67-GHz compact QVCO achieves 0.46 degree and 0.47 dB phase and amplitude mismatches, respectively, and a phase noise of −105.8 dBc/Hz at 1-MHz offset, resulting in a figure-of-merit of −183 dBc/Hz.