Time domain integrated temperature sensor

A temperature sensor, time domain technology, used in thermometers, thermometer parts, thermometers that give average/integrated values, etc., can solve problems such as inconsistent readings

Active Publication Date: 2014-06-04
EXCELIO TECH SHENZHEN
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  • Description
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  • Application Information

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 hav

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0033] Figure 4 It is a structural block diagram of the temperature sensor circuit of the present invention, the temperature sensor circuit 100 includes a PTAT delay circuit 1, a CTAT delay circuit 2, an exclusive OR gate 3 and a counter 4, and the two input terminals of the exclusive OR gate 3 are respectively Connected to the output end of PTAT delay circuit 1 and the output end of CTAT delay circuit 2, the output end of described XOR gate 3 is connected with th...

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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 ...

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Application Information

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IPC IPC(8): G01K1/00
CPCG01K3/04G01K7/01G05F1/463H03K5/153H03K17/687H03K19/21H03K21/026H03K2005/00019
Inventor 马彪吴边韩富强
Owner EXCELIO TECH SHENZHEN
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