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Providing linear relationship between temperature and digital code

A linear relationship, digital code technology, used in thermometers, thermometers with analog-to-digital converters, thermometers with electrical/magnetic components directly sensitive to heat, etc., can solve inaccurate temperature measurement, poor temperature measurement accuracy, DAC code relative temperature nonlinearity and other issues

Active Publication Date: 2010-10-27
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the comparison voltage is PTAT, this method will inherently cause the non-linearity of the DAC code with respect to temperature, and, in the absence of other temperature correction measures (such as multi-point correction techniques), there will be poor temperature measurement accuracy.
To achieve better DAC code versus temperature linearity, other techniques have tried to parallelize the curves of the comparison voltage (or reference voltage), however, these techniques have been unsuccessful since the multiple curves cannot actually be parallel to each other
These known techniques also therefore suffer from inaccurate temperature measurements

Method used

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  • Providing linear relationship between temperature and digital code
  • Providing linear relationship between temperature and digital code
  • Providing linear relationship between temperature and digital code

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Embodiment Construction

[0035] Embodiments of the present invention relate to a method capable of providing a linear relationship between temperature and digital code. Various embodiments may be applied in temperature sensors. In some embodiments, at a specific temperature (eg, the operating temperature of a semiconductor device), a circuit in the sensor (eg, a temperature sensing circuit) may apply a temperature-dependent reference voltage (eg, V CTAT ) with a comparison voltage (such as V CMP ) to the comparator. V CTAT Depends on temperature in a manner complementary to absolute temperature. Comparison voltage V CMP It is generated by taking the DAC code as input. If V CTAT with V CMP are equal (eg, substantially equal), the comparator outputs a signal indicating this fact (eg, in a logic high state). If V CTAT with V CMP When not equal, the comparator output is provided to additional circuitry (such as a correction circuit) that alters the DAC code until V CTAT with V CMP Both are equ...

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Abstract

The method involves providing a temperature dependent reference voltage (VCTAT) and a compared voltage (VCMP) for identifying digital code corresponding to the temperature. The temperatures are linearly related to the digital codes. The VCTAT is dependent on the temperature which is either complementary or proportional to absolute temperature. The VCMP is affected by a negative temperature coefficient which is combined with a positive temperature coefficient.

Description

technical field [0001] The present invention relates to a method of providing a linear relationship between digital code and temperature. Various embodiments are used in temperature sensors. Background technique [0002] The temperature sensor can be used to monitor the Central Processing Unit (Central Processing Unit, CPU), graphics processing unit (Graphics Processing Unit, GPU), micro processing (Micro Processing Unit, MPU), single chip system (System On Chip, SOC), etc. temperature of electronic components. When the temperature exceeds the preset threshold, the sensor can send an alarm to tell the circuit to reduce the operating speed, or even shut down its operation to reduce power consumption and reduce the temperature, thereby preventing structural damage to components due to overheating. [0003] Generally, a temperature sensor includes a reference circuit and a temperature measurement circuit, and its temperature dependence is either proportional to absolute tempe...

Claims

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Application Information

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IPC IPC(8): G01K7/00
CPCG01K2219/00G01K7/01G01K7/14
Inventor 隋彧文陈建宏
Owner TAIWAN SEMICON MFG CO LTD