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Wide tuning range inversion-mode gated varactor and its application on a 2-GHz VCO

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5 Author(s)
Wong, W. ; Dept. of Electron. & Electr. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, Hong Kong ; Hui, F. ; Zhiheng Chen ; Keqiang Shen
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This paper presents a novel inversion-mode three-terminal varactor with a capacitance ranging from 0.7 pF to 2.3 pF, achieving a /spl plusmn/53% variation in the capacitance. The new device is implemented in a 0.35-/spl mu/m standard CMOS process. The measured quality factor is 22 at 2 GHz. A 2-GHz VCO is designed with this new varactor and is able to achieve a tuning range of 320 MHz with a maximum tuning gain of 220 MHz/V.

Published in:

VLSI Circuits, 1999. Digest of Technical Papers. 1999 Symposium on

Date of Conference:

17-19 June 1999