A low injection spur injection-locked LC-QVCO with self-injection technique

This paper presents a self-injection technique used in injection-locked QVCO (IL-QVCO) with inherently perfect injection timing. In self-injection technique, injection pulse is generated using QVCO’s own oscillation signal. Two comparators and two dividers are utilized to generate two injection pulses for each core. Post simulation results show that injection spur is optimized by 20% compared with conventional QVCO and achieves -47dBc under tt process conrner. The phase noise achieves -131.4dBc/Hz at lMHz offset at 2. 4GHz oscillating frequency. Phase noise performance of proposed IL- QVCO is optimized by 7dBc/Hz compared with conventional one. The total current consumption is 4. 8mA at the supply voltage of l. 8V. It occupies area of l. 032mm2, totally.