Time domain integrated temperature sensor

Abstract

The invention provides a time domain integrated temperature sensor. Charging time of a capacitor is controlled through a shaped clock signal, so that the capacitor generates a charging time delay signal related with an input clock cycle. A time delay signal produced due to the fact that a path of PTAT currents charge the capacitor in the preceding control mode and a time delay signal produced due to the fact that a path of CTAT currents charge the capacitor in the same mode generate a pulse signal through an XOR operation, the width of the pulse signal is related with temperature and the input clock cycle, the pulse width of the pulse signal is quantized through the same input clock signal, and the obtained quantized result is completely counteracted with relevance of the input clock cycle, namely, an output value of the temperature sensor has no relation with the cycle of the input clock signal. The problem that due to the fact that an existing time domain integrated temperature sensor changes with the clock signal cycle, readings are inconsistent is solved, and precision of the time domain integrated temperature sensor is improved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of temperature sensors, in particular to an integrated temperature sensor which performs signal processing on the temperature value measured by the temperature sensor in the time domain. Background technique [0002] At present, the demand for integrated intelligent temperature sensors in the fields of medical monitoring, household appliances, consumer electronics, Internet of Things, intelligent sensing, automotive electronics, and intelligent control is increasing, and at the same time, there are more stringent requirements for its accuracy. Research institutions and enterprises at home and abroad have achieved some research results in the integration of smart temperature sensors, such as: Ching-Che Chung published in "IEEE Proceedings of 2010 International Symposium on Circuits and Systems" "An All-Digital Smart Temperature Sensor with Auto- Calibration in65nm CMOS Technology", Poki Chen et al. published ...

AI Technical Summary

Problems solved by technology

[0009] The clock signal period of the time-domain integrated temperature sensor in the prior art is easily affected by the application system, circuit parameters, working environment, and manufacturing process, and there will be large changes. The problem of inconsistent readings due to changes, the present invention provides a time-domain integrated temperature sensor whose measured temperature readings have nothing to do with the period of the clock signal, thus ensuring that it can be used in occasions where the frequency of the clock signal changes greatly (such as integrated in passive radio frequency identification tags) The consistency of the readings of the time-domain temperature sensor in the time-domain temperature sensor) improves the accuracy of the time-domain temperature sensor to a certain extent

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