Temperature sensor, method for calibrating the same, and semiconductor device

Abstract

A temperature sensor for generating bit stream having duty ratio depending on temperature, includes: voltage generator to receive control bit and output first voltage having CTAT characteristic when the control bit is in first state and to output second voltage having PTAT characteristic when the control bit is in second state; integrating circuit to integrate value obtained by multiplying input voltage with a first coefficient in the first state and to integrate value obtained by multiplying the input voltage with second coefficient in the second state; quantizer to generate the bit stream by quantizing an output of the integrating circuit; pattern generator which is enabled in calibration mode and generates test signal having predetermined duty ratio; and subtraction circuit which is enabled in the calibration mode and subtracts reference voltage for calibration from an output voltage of the voltage generator in the first state.