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http://dx.doi.org/10.5573/IEIESPC.2016.5.2.071

A Fabrication and Testing of New RC CMOS Oscillator Insensitive Supply Voltage Variation  

Kim, Jin-su (Department of Electronic Engineering, College of Engineering, Cheongju University)
Sa, Yui-hwan (Department of Electronic Engineering, College of Engineering, Cheongju University)
Kim, Hi-seok (Department of Electronic Engineering, College of Engineering, Cheongju University)
Cha, Hyeong-woo (Department of Electronic Engineering, College of Engineering, Cheongju University)
Publication Information
IEIE Transactions on Smart Processing and Computing / v.5, no.2, 2016 , pp. 71-76 More about this Journal
Abstract
A controller area network (CAN) receiver measures differential voltage on a bus to determine the bus level. Since 3.3V transceivers generate the same differential voltage as 5V transceivers (usually ${\geq}1.5V$), all transceivers on the bus (regardless of supply voltage) can decipher the message. In fact, the other transceivers cannot even determine or show that there is anything different about the differential voltage levels. A new CMOS RC oscillator insensitive supply voltage for clock generation in a CAN transceiver was fabricated and tested to compensate for this drawback in CAN communication. The system consists of a symmetrical circuit for voltage and current switches, two capacitors, two comparators, and an RS flip-flop. The operational principle is similar to a bistable multivibrator but the oscillation frequency can also be controlled via a bias current and reference voltage. The chip test experimental results show that oscillation frequency and power dissipation are 500 kHz and 5.48 mW, respectively at a supply voltage of 3.3 V. The chip, chip area is $0.021mm^2$, is fabricated with $0.18{\mu}m$ CMOS technology from SK hynix.
Keywords
RC oscillator; CAN(controller area network); CMOS oscillator;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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