A High Frequency Ring-VCO with Wide Tuning Range

Abstract

In this paper, a high frequency ring-VCO using an improved differential delay-cell (DD-cell) is presented. The proposed DD-cell benefits from a bandwidth extension technique. Facilitated by the wide band cell, the oscillation frequency of the proposed VCO can be increased up to 15.45 GHz. The DD-cell has tunable loads, which is used to change the operating frequency of the proposed VCO between 6-15.45 GHz. The proposed VCO has been designed and simulated in CMOS 65nm process with 1V supply voltage and consumes about 4.38 mW of power when oscillating at 15.45 GHz and 3.7 mW for 8 GHz output signal. The FoM of the proposed ring-VCO is equal to 153.7 dBc/Hz.