NDLI: A low power quadrature and divide-by-two frequency VCO design mixer with charge-injection for biomedical applications

Content Provider	IEEE Xplore Digital Library
Author	Wen-Cheng Lai Jhin-Fang Huang Pi-Gi Yang Chien-Ming Hsu Kuo-Lung Chen
Copyright Year	2014
Description	Author affiliation: Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan (Wen-Cheng Lai; Jhin-Fang Huang; Pi-Gi Yang; Chien-Ming Hsu) \|\| Nat. Commun. Comm., Taiwan (Kuo-Lung Chen)
Abstract	A new fully integrated, low power complementary cross-coupled quadrature voltage-controlled oscillator (QVCO), divide-by-two frequency divider and double-balance mixer for biomedical applications are presented. The features of our proposed circuit are using charge recycling technique to reduce current from the divider, employing adaptive body-biasing technique (ABB) to drop the minimum voltage clearance of the VCO and achieving two quadrature frequencies which are 2.0 GHz and 4.0 GHz bands. The VCO use differentially tuned MOS varactors can diminish the bad effect of high varactor sensitivity by excluding the common-mode noise. The proposed QVCO and double-balance mixer were implemented in 0.18 um CMOS process with 1.8 V supply voltage, is employed to modulate a wireless communication signal for proposed interactive intelligent healthcare monitoring system (IIHMS). Measured results indicate the divider output frequency is tunable from 1.91 GHz to 2.07 GHz and the QVCO output is from 3.82 GHz to 4.14 GHz, corresponding to 8.05 %. The phase noise of the QVCO operating at 2.02 GHz is -121.8 dBc/Hz at 1 MHz offset. This QVCO draws 2.61 mA and 4.7 mW power consumption. The output power is -17.15 dBm with a 50-Ω load at the frequency of 2.02 GHz. The broadband CMOS double-balance mixer input return loss is higher than 8.5 dB.
Starting Page	583
Ending Page	586
File Size	465415
Page Count	4
File Format	PDF
e-ISBN	9781479958382
DOI	10.1109/BMEI.2014.7002841
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-10-14
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase noise Varactors Voltage-controlled oscillators QVCO Frequency conversion low power CMOS integrated circuits mixer with charge-injection frequency divider Tuning voltage-controlled oscillator
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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