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Temperature sensing circuit and integrated CMOS temperature sensor

A circuit and temperature change technology, which is applied to thermometers, thermometers, instruments, etc. that use directly heat-sensitive electric/magnetic components, can solve the problem of low precision of CMOD temperature sensors, achieve high-precision temperature values, and reduce output errors. Effect

Active Publication Date: 2013-08-21
SHANGHAI BEILING
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low accuracy of the existing CMOD temperature sensor, thereby providing a new temperature sensing circuit and integrated CMOS temperature sensor

Method used

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  • Temperature sensing circuit and integrated CMOS temperature sensor
  • Temperature sensing circuit and integrated CMOS temperature sensor
  • Temperature sensing circuit and integrated CMOS temperature sensor

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Embodiment Construction

[0028] The composition and working principle of the temperature sensing circuit of the present invention will be described in detail below according to the accompanying drawings.

[0029] Such as figure 1 Shown is a schematic diagram of the composition of the integrated CMOS temperature sensor with the temperature sensing circuit of the present invention. In this architecture, the integrated CMOS temperature sensor includes the temperature sensing circuit 100 of the present invention, the bias circuit 200, the Delta-sigma analog-to-digital conversion integrator 300, the sampling filter 400 and the clock circuit 500, wherein the temperature sensing circuit 100 is used for Output the first voltage ΔV representing the temperature change BE and the second voltage amount V BE The bias circuit is used to provide a bias signal to the temperature sensing circuit; the Delta-sigma analog-to-digital conversion integrator (Delta-sigma ADC) 300 outputs the control signal BS to the temper...

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Abstract

The invention discloses a temperature sensing circuit and an integrated CMOS temperature sensor. The temperature sensing circuit comprises a mirror image current source set, a dynamic matching module, a gating module, a first temperature sensing triode and a second temperature sensing triode, wherein the gating module is used for gating multiple unit current mirrors in the mirror image current source set according to control signals received by the gating module and outputting gating currents. Through balanced circuit arrangement, the dynamic matching module carries out dynamic allocation on input currents by means of the dynamic matching module, two clock phases are preferentially used for data output, output errors caused by device process differences are eliminated or reduced, and therefore high-precision temperature values can be obtained.

Description

technical field [0001] The invention relates to an integrated CMOS temperature sensor, more specifically, a temperature sensing circuit and an integrated CMOS temperature sensor including the temperature sensing circuit. Background technique [0002] Traditional temperature sensors use platinum resistors or mercury as temperature-sensing materials. Continuously changing temperature values ​​need to be converted into digital codes by an analog / digital converter (ADC) circuit independent of temperature-sensing materials, and then provided to the chip for temperature measurement values. . Independent temperature-sensing materials are not easy to integrate into chips. [0003] The CMOS temperature sensor integrated on the chip uses the parasitic PNP transistor in the CMOS process as the temperature sensing element, and uses V BE Decreases linearly with temperature and ΔV BE With the characteristic of increasing linearly with the temperature, the value representing the tempera...

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Application Information

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IPC IPC(8): G01K7/01
Inventor 李鹏张亮张辉陈宁
Owner SHANGHAI BEILING
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