A new accumulation MOS varactor with island-shaped poly gate layout is proposed to improve the quality factor (Q-factor) at high frequency, which can be readily employed for CMOS-based millimeter-wave applications. Measured results up to 67 GHz show significant improvements in the Q-factor and the series resistance Rs over the conventional multi-finger MOS varactors with the same ground rule and gate area. The proposed island-gate MOS varactor is expected to improve the overall Q-factor of the LC tank of millimeter-wave oscillators.
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering