ABSTRACT
A coupled-inductors dual-mode switch cross-coupled pair voltage-controlled oscillator (VCO) was presented, adopting GaN-on-Si high-electron-mobility transistor technology. The coupled inductors create two resonant frequencies that cover a wide frequency range. The two continuous bands were achieved by using coupled inductors, and the fine-tuning is controlled by varactors. The low and high bands of the VCO were 2.77–3.11 GHz and 3–3.28 GHz, in the Vc range between 10 and 17 V, respectively, which corresponds to a 16.7% (510 MHz) tuning range. The lowest phase noise was −123 dBc/Hz at an offset frequency of 1 MHz, and the highest output power was 17.7 dBm using a 7.5-V power supply.
Acknowledgements
The authors wish to thank CIC of the National Science Council and High Speed Intelligent Communication Research Center of CGU in Taiwan for their help. This work was partially supported by the Ministry of Science and Technology of Taiwan [no. 104-2221-E-182-006].
Disclosure statement
No potential conflict of interest was reported by the authors.