| Title | High Precision 16-bit Readout Gas Sensor Interface in 0.13 #x003BC;m CMOS |
| Publication Type | Conference Paper |
| Year of Publication | 2007 |
| Authors | Jayaraman, B, Bhat, N |
| Conference Name | 2007 IEEE International Symposium on Circuits and Systems |
| Date Published | May |
| Keywords | 0.13 micron, 1 to 10 MHz, 1.2 V, 13 bit, 16 bit, 366 μW, Capacitors, CMOS integrated circuits, CMOS technology, Counting circuits, Digital-to-frequency converters, Dynamic range, Energy consumption, Frequency conversion, frequency-to-digital conversion, front end signal conditioning circuit, Gas detectors, gas sensor interface, gas sensors, high precision readout circuit, Immune system, low power resistance-to-time period converter, Mirrors, power consumption, readout electronics, signal processing equipment |
| 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. |
| DOI | 10.1109/ISCAS.2007.378057 |
