Title :
A low power CMOS temperature-to-frequency converter for RFID applications
Author :
Bistue, Guillermo ; Solar, Hector ; Fernandez, Erik ; Lujan-Martinez, Clara ; Del Pino, Javier ; Alvarado, Unai
Author_Institution :
Electron. & Commun. Dept., Univ. of Navarra, San Sebastián, Spain
Abstract :
This paper presents the design of a low power temperature sensor based on temperature-to-frequency conversion for RFID applications. The variation of temperature is detected by a PTC resistor that determines the reference current of a bootstrapped cascode source. This current is used to bias an active inductor. The self-resonance frequency varies accordingly to the shift of the current, thus providing the temperature to frequency conversion. The circuit has been implemented using a standard 65 nm CMOS technology. A frequency of oscillation of 31.3 MHz at 20°C has been obtained, with an estimated sensitivity of 50.5 kHz/°C, a resolution of 0.12°C and a power consumption of 21.8 uW within the 0-80°C temperature range.
Keywords :
CMOS analogue integrated circuits; bootstrap circuits; frequency convertors; inductors; integrated circuit design; low-power electronics; power consumption; radiofrequency identification; temperature sensors; CMOS technology; PTC resistor; RFID; active inductor; bootstrapped cascode source; frequency 31.3 MHz; low power CMOS temperature-to-frequency converter; low power temperature sensor; power 21.8 muW; power consumption; radiofrequency identification; reference current; self-resonance frequency; size 65 nm; temperature 0 degC to 80 degC; temperature-to-frequency conversion; Active inductors; CMOS integrated circuits; Oscillators; Power demand; Temperature measurement; Temperature sensors; CMOS; RF circuits; RFID; low power circuits; temperature sensor;
Conference_Titel :
Design of Circuits and Integrated Circuits (DCIS), 2014 Conference on
Conference_Location :
Madrid
DOI :
10.1109/DCIS.2014.7035580
