A Low-Power Quadrature LC-Oscillator Using Core-and-Coupling Current-Reuse

In this paper, a low-power quadrature LC-oscillator using the current-reuse technique is presented. In the proposed topology, both the core-and-coupling currents are reused to reduce the power consumption. A quadrature LC-oscillator is designed in CMOS 65 nm technology for Bluetooth at 2.45 GHz. The oscillator consumes 2.8 mA of current from a 0.85 V supply voltage. The oscillator's simulated phase noise at 3 MHz offset from the 2.45 GHz center frequency is -130.162 dBc/Hz, resulting in a figure-of-merit (FoM) of 184.4 dB.