A CMOS High-Performance Inductorless Ring VCO with Extended Monotonic Tuning Voltage Range

抄録

A high-performance inductorless ring VCO with wide tuning range and extended monotonic tuning voltage range (MTVR) is proposed and fabricated in standard 0.18μm CMOS technology. By combining the crossing-strength-tuning and load-resistance-tuning techniques with opposite tuning characteristics, the MTVR for the proposed VCO can be widened significantly. The dual-delay path technique is employed to improve the oscillating frequency. The cross-coupled pair is added to reduce phase noise and guarantee reliable differential-mode oscillation over the wide tuning voltage range. With an occupied area of 475µm×275µm and a single supply voltage of 1.8V, measurement results show the proposed VCO can oscillate with a frequency range from 1.57 to 2.76GHz, phase noise of -91.12dBc/Hz @ 1MHz and FOM_T of 164.5 dBc/Hz @ 1MHz and extended MTVR.