Abstract
In this paper, a CMOS temperature sensor with a highly linear proportional-to-absolute-temperature (PTAT) output current, which results from a PTAT-voltage driving common-source amplifier with a source resistor, is presented. The second-order temperature coefficients of the PTAT voltage and the resistance of polysilicon and diffused-silicon resistors are all positive and hence the resulting current exhibits high linearity of at least 99.999% from 0 to 100°C. With a silicided p-type polysilicon source resistor, the simulated and measured temperature characteristics of pulse frequencies exhibit sensitivities of 424 and 512Hz/°C with linearities of 99.996% and 99.993%, respectively.
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