IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
A CMOS QVCO using combined capacitor-coupling, bottom-series coupling and splitting switched biasing techniques
Changchun ZhangYingjian WuChenghong DongYi ZhangYing ZhangYufeng Guo
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2018 Volume 15 Issue 22 Pages 20180861


A quadrature voltage-controlled-oscillator (QVCO) is presented and fabricated in standard 0.18 µm RF CMOS technology. Passively Capacitor coupling, actively bottom-series (BS) coupling and splitting switching biasing (SSB) techniques are combined and employed for the QVCO to improve its phase noise performance without loss of the voltage headroom. Measured results show the proposed QVCO achieves a tuning range from 0.88 to 1.04 GHz, phase noise of −71.2 dBc/Hz@1 kHz and −113.1 dBc/Hz@1 MHz, and a phase-noise figure-of-merit (FOMT) of 189.7 dBc/Hz from a offset frequency of 1 kHz, with an occupied die area of 1283 µm × 715 µm and power consumption of 11 mW from a 1.8 V voltage supply.

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© 2018 by The Institute of Electronics, Information and Communication Engineers
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