Abstract
In this paper, a smart temperature sensor working at a supply voltage as low as 0.9V over the full military temperature range is presented. Low voltage operation is achieved by biasing the front-end BJT pairs with different emitter currents for two different sensing ranges, from 55°C to 30°C and from 20°C to 125°C, respectively. A second-order inverter-based ΣΔADC with dynamic element matching (DEM) and input signal chopping to control the conversion error to within 0:2°C is used for digital readout. Front-end bias currents are selected during the design stage to minimize the induced sensing error. The proposed sensor is implemented using the TSMC 0.18μm 1P6M process. Simulation result shows that a +1°C=0:1°C sensing error using one-point calibration can be achieved from 55°C to 125°C. At a sampling speed of 20 samples/s, the sensor consumes 3.4μA and 4.7μA in the low temperature range and the high temperature range, respectively.
Original language | English |
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Pages | 3114-3117 |
Number of pages | 4 |
DOIs | |
Publication status | Published - 2012 |
Externally published | Yes |
Event | 2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012 - Seoul, Korea, Republic of Duration: 20 May 2012 → 23 May 2012 |
Conference
Conference | 2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012 |
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Country/Territory | Korea, Republic of |
City | Seoul |
Period | 20/05/12 → 23/05/12 |