Title :
High Precision 16-bit Readout Gas Sensor Interface in 0.13μm CMOS
Author :
Jayaraman, Balaji ; Bhat, Navakanta
Author_Institution :
Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore
Abstract :
A high precision 16-bit readout circuit for gas sensor interface is realized in 0.13μm CMOS technology. The front end signal conditioning circuit comprises a low power resistance-to-time period converter with subthreshold operation of transistors. The time-period proportional to the transducer output is digitized using a counter based frequency-to-digital conversion (FDC) technique. In order to handle the sensor signal with a dynamic range of 160dB, subranging technique is employed to provide feedback to front end circuit interfacing the sensor. While the 3 MSBs of 16-bit word restrict the input frequency to FDC between 1MHz and 10MHz, the 13-bit counter operates on this signal to provide a worst case resolution of 0.4%. The power consumption of the readout circuit is 366μW from a 1.2V supply.
Keywords :
CMOS integrated circuits; gas sensors; power consumption; readout electronics; signal processing equipment; 0.13 micron; 1 to 10 MHz; 1.2 V; 13 bit; 16 bit; 366 μW; CMOS technology; frequency-to-digital conversion; front end signal conditioning circuit; gas sensor interface; high precision readout circuit; low power resistance-to-time period converter; power consumption; CMOS technology; Capacitors; Counting circuits; Digital-to-frequency converters; Dynamic range; Energy consumption; Frequency conversion; Gas detectors; Immune system; Mirrors;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.378057
