A High Frequency Ring-VCO with Wide Tuning Range

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...