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Telecommunications and Radio Engineering
SJR: 0.203 SNIP: 0.44 CiteScore™: 1

ISSN Print: 0040-2508
ISSN Online: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v72.i16.80
pages 1537-1544

A 1-V SUPPLY VOLTAGE CONTROLLED OSCILLATOR FOR INTRAOCULAR PRESSURE MEASUREMENT

A. E. Rendon-Nava
Polytechnic National Institute, D.F., Mexico; National Institute for Astrophysics, Optic & Electronics, Puebla, Mexico
Luis Nino-de-Rivera
National Polytechnic Institute of Mexico (IPN), National Institute for Astrophysics, Optic & Electronics, Puebla, Mexico
J. A. Diaz-Mendez
Polytechnic National Institute, D.F., Mexico; National Institute for Astrophysics, Optic & Electronics, Puebla, Mexico

ABSTRACT

A 1-V supply LC (Inductive-Capacitive) VCO (Voltage Controlled Oscillator) for intraocular pressure measurement is presented. The VCO is fabricated in standard 0.18−μm CMOS (Complementary Metal Oxide Semiconductor) technology and occupies an active area of 700×750 μm2. Two varactors from the 0.18−μm process are used to emulate a MEMS (Micro Electro-Mechanical System) capacitive membrane response (pressure sensor). A response with very good linearity was achieved within a tuning range of 6%, which fits the MEMS pressure sensor variation range. The phase noise was −85 dBc/Hz at a 600−KHz offset from the carrier frequency at 500 MHz. The power consumption was 10 mW from a 1-V power supply.


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