Title :
Low power successive approximation A/D converter for passive RFID tag sensors
Author :
Marjonen, J. ; Alaoja, R. ; Ronkainen, H. ; Åberg, M.
Author_Institution :
VTT Inf. Technol., Espoo
Abstract :
A low power 10b A/D converter (ADC) for passive RFID sensor applications was designed and measured. The chip contained an offset voltage self correction sample-and-hold circuit (SHC) having a large input impedance required by capacitive sensors. The ADC is a successive approximation type converter used at clock frequency of 2 kHz. Sampling frequency was 75 Hz. Measured integral (INL) and differential (DNL) nonlinearities were 3.3 LSB and 4 LSB. The stand by power consumption was 2.3 muW at 1.8V supply voltage
Keywords :
analogue-digital conversion; capacitive sensors; low-power electronics; passive networks; radiofrequency identification; 1.8 V; 2 kHz; 2.3 muW; 75 Hz; A/D converter; capacitive sensors; low power successive approximation; passive RFID tag sensors; sample and hold circuit; Capacitive sensors; Circuits; Clocks; Frequency conversion; Impedance; Passive RFID tags; Power measurement; Radiofrequency identification; Semiconductor device measurement; Voltage;
Conference_Titel :
Baltic Electronics Conference, 2006 International
Conference_Location :
Tallinn
Print_ISBN :
1-4244-0414-2
Electronic_ISBN :
1736-3705
DOI :
10.1109/BEC.2006.311072
