DBPapers
DOI: 10.5593/SGEM2014/B21/S7.017

DIGITAL THERMAL SENSOR FOR FPGA LOCAL AREA BASED ON MONTE-CARLO METHOD

P. Kustarev, S.Bikovsky, A.Antonov
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-10-0 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 1, 127-134 pp

ABSTRACT
The article covers temperature measurement in systems on chip. The main scientific result, obtained by the authors, is the development of digital temperature sensor circuit, which can be coded with HDL languages (e.g. VHDL or Verilog HDL) and implemented in design on RTL design stage. The sensor has fully digital design, same as most FPGA devices. So, it is not necessary to implement extra dedicated units in FPGA devices. Using these sensors in ASIC designs removes the necessity to combine analog and digital design. The circuit can be implemented on one technological process stage. Moreover, placement and routing of entire unit, including the sensing part, can be performed automatically. The main operating principle of the sensor is based on estimation of signal propagation delay through the logic cell, which depends on the temperature. The propagation delay is evaluated by Monte-Carlo method. In the article, we prove the possibility to use periodic signals as pseudo-random, make the structural and functional description of the proposed sensor and present the results of its experimental implementation, as well as sensor network implementation for local overheating detection.

Keywords: TDC, FPGA, SoC, temperature sensor, ring oscillator

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