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A Temperature and Process Insensitive CMOS Only Reference Current Generator

Bethi, Shiva Sai
http://rave.ohiolink.edu/etdc/view?acc_num=akron1416406367

Abstract Details

2014, Master of Science in Engineering, University of Akron, Electrical Engineering.
This thesis presents the design of a temperature and process insensitive CMOS only reference current generator. The proposed reference current generator consists of a conventional CMOS Widlar current source, in which the passive resistor is replaced with a transistor resistor. The gate voltage of the transistor resistor is provided by a gate bias generator that makes the output current insensitive to temperature variation. Furthermore, to achieve a process insensitive reference current, three separate gate bias generator circuits for nominal, strong and weak corners were designed. These gate bias generators are manually selected by the control switches to minimize the current variation under different process corners. As an extension of the manual mode selector, the design of an automatic mode selector that automatically selects the optimum gate bias generators to minimize the current variation under different process corners is realized. The proposed reference current generator can be used for high temperature sensor interface applications that include amplifiers, oscillators, filters and data converters. The proposed reference current generator is designed using 0.5 µm CMOS SOI technology, and the operation has been verified through circuit level simulations. The results show for a reference current of 20 µA, a temperature coefficient of 39 ppm/°C is achieved in the temperature range between 25°C and 125°C for the nominal process corner. Using the mode control circuits for different process corners, worst-case temperature coefficients of 520 ppm/°C and 300 ppm/°C are obtained for the weak and the strong corners, respectively
Kye-Shin Lee, Dr. (Advisor)
Joan Carletta, Dr. (Committee Member)
Robert Veillette, Dr. (Committee Member)
58 p.
Electrical Engineering
CMOS reference current generator

Recommended Citations

Citations

  • Bethi, S. S. (2014). A Temperature and Process Insensitive CMOS Only Reference Current Generator [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1416406367

    APA Style (7th edition)

  • Bethi, Shiva Sai. A Temperature and Process Insensitive CMOS Only Reference Current Generator . 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1416406367.

    MLA Style (8th edition)

  • Bethi, Shiva Sai. "A Temperature and Process Insensitive CMOS Only Reference Current Generator ." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1416406367

    Chicago Manual of Style (17th edition)

akron1416406367
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© 2014, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.