IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
An ultra-compact LC-VCO using a stacked-spiral inductor
Rui MurakamiToshihiko ItoKenichi OkadaAkira Matsuzawa
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2011 Volume 8 Issue 7 Pages 512-517

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Abstract

This paper proposes an ultra compact LC-VCO. Due to the speed-up of CMOS digital circuits, jitter of ring oscillators is becoming a critical problem. Even though an LC-VCO has a better phase noise, a layout size of on-chip inductor is a problem as a clock generator. Thus, the proposed LC-VCO consists of a very compact stacked-spiral inductor and active components placed are beneath the inductor. The VCO is implemented by a 65-nm CMOS process, and the chip area is only 594µm2. This VCO achieves a phase noise of -93dBc/Hz@1MHz, power consumption of 0.36mW, and FOMA of 210dBc/Hz.

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© 2011 by The Institute of Electronics, Information and Communication Engineers
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