期刊
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
卷 67, 期 12, 页码 2963-2967出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2020.2999494
关键词
Bandgap reference; CMOS; sigma-delta thermal sensor
资金
- Israel Innovation Authority
Thermal sensors are used in CPU's to detect hot spots and determine voltage levels. Since thermal gradients can be instruction dependent, there can be as many as 40 sensors/chip, which requires them to be compact. The industry standard for thermal sensors is the bandgap based PNP BJT sensor, because of its predictable and well-known physics. In this brief, a 1450 um(2) charge-sharing BJT-based thermal sensor, with a 50 um(2) sensing element, in 65nm is described. After a 1-point trim, the sensor exhibits a peak-to-peak accuracy of -2/+4 degrees C over a 150 degrees C range. After a 2-point trim, this becomes -2.5/+1.5 degrees C over the same range. It also achieves a resolution of 0.22 degrees C in an 821 mu s conversion time. These specifications, as well as the small area, make the sensor attractive for dense CPU thermal monitoring.
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