A Low-Power and High-Linear Current to Time Converter for Wireless Sensor Networks

Ryota SAKAMOTO  Koichi TANNO  Hiroki TAMURA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E95-A   No.6   pp.1088-1090
Publication Date: 2012/06/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E95.A.1088
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Circuit Theory
current to time converter,  temperature sensor,  analog to digital converter,  CMOS analog circuit,  

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In this letter, we describe a low power current to time converter for wireless sensor networks. The proposed circuit has some advantages of high linearity and wide measurement range. From the evaluation using HSPICE with 0.18 µm CMOS device parameters, the output differential error for the input current variation is approximately 0.1 µs/nA under the condition that the current is varied from 100 nA to 500 nA. The idle power consumption is approximately zero.