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Temperature detection circuit

A temperature detection circuit and resistance string technology, applied in thermometers, measuring devices, measuring heat, etc., to achieve the effect of reducing complexity, circuit area and cost

Active Publication Date: 2020-02-28
成都三零嘉微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a reference voltage VBE generation unit is required in the circuit

Method used

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  • Temperature detection circuit

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Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 2 Shown, a temperature detection circuit of the present invention. The circuit includes resistor 210 , controlled resistor string 220 , comparator 230 and control logic 240 .

[0025] One end of the resistor 210 is connected to the fixed level and the positive input end of the comparator, the other end is connected to the negative input end of the comparator 230 and one end of the controlled resistor string 220, and the output end of the comparator 230 is connected to the input end of the control logic 240, The output terminal of the control logic 240 is connected to the digital control input terminal of the controlled resistor 220, and the output terminal of the control logic 240 is used as the output T_CODE of the temperature detection result. After a circuit temperature detection is completed, the voltage on the resistor 210 is equal to the input offset voltage of the comparator.

[0026] Wherein, the control logic circuit 240 is a successive approx...

Embodiment 2

[0028] Preferably, as image 3 As shown, the temperature detection circuit diagram provided by an embodiment of the present invention, the circuit is composed of a resistor 210 , a controlled resistor string 220 , a comparator 230 and a control logic 240 . The controlled resistance string 220 is composed of MOS transistors 321b, 322b...32nb and resistors 321a, 322a...32na, the sources and drains of the MOS transistors 321b, 322b...32nb are connected in series in sequence, and are respectively connected to the resistors 321a, 322a... Both ends of 32na are connected, and the gate is connected to the output terminal of the control logic 240 .

[0029] The comparator 230 is made up of NMOS transistors 331, 332, 336 and 337 and PMOS transistors 333, 334 and 335. The NMOS transistors 331 and 332 are the input pairs of the comparator 230, and their sources are connected to each other and connected to the NMOS transistor 336 at the same time. The drains are respectively connected to ...

Embodiment 3

[0034] Preferably, as Figure 4 As shown, the temperature detection circuit diagram provided by an embodiment of the present invention, the circuit is composed of a resistor 210 , a controlled resistor 220 , a comparator 230 and a control logic 240 . The controlled resistor 220 is composed of MOS transistors 421b, 422b...42nb and resistors 421a, 422a...42na. The terminals are connected, and the gate is connected to the output terminal of the control logic 240 . The comparator 230 is made up of PMOS transistors 431, 432, 436 and 437 and NMOS transistors 433, 434 and 435. The PMOS transistors 431 and 432 are the input pairs of the comparator, and their sources are connected to each other and simultaneously connected to the drain of the PMOS transistor 436. The drain of 431 is connected to the drain of NMOS transistor 433, the drain of 432 is connected to the drain of NMOS transistor 434, the gate of 431 is connected to one end of the resistor 210 and is connected to the referen...

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PUM

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Abstract

The invention relates to the field of integrated circuits, and discloses a temperature detection circuit which comprises a resistor, a controlled resistor string, a comparator and control logic, wherein one end of the resistor is connected with the fixed level and the positive input end of the comparator, and the other end of the resistor is connected with the negative input end of the comparatorand one end of the controlled resistor string; the output end of the comparator is connected with the input end of the control logic; the output end of the control logic is connected with the digitalcontrol input end of a controlled resistor and serves as output of a temperature detection result; and the input offset voltage of the comparator is proportional to the temperature, and the temperature detection result can be obtained according to the input offset voltage. The circuit only comprises an MOS transistor and a resistor device, and can be realized in a CMOS process; and a temperature sensing circuit does not need to be specially designed and an analog-to-digital conversion circuit is not needed, so that the complexity of the circuit is reduced and the circuit area and cost are effectively reduced.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a temperature detection circuit. Background technique [0002] Temperature is a physical phenomenon, which has a profound impact on us in production, life and all walks of life. The temperature sensor circuit is a very widely used circuit. With the rise of the field of artificial intelligence in recent years, the temperature sensor is used as a basic component, and the market demand continues to expand. At the same time, temperature has a great impact on chip performance. When the temperature of the chip logic system exceeds the limit, it is easy to generate wrong timing or flip, and enter an abnormal working state, resulting in internal data errors, operation errors, or abnormal reading of memory contents. error, leading to internal information disclosure. The temperature detection circuit detects the internal temperature of the chip in real time, and generates an alarm sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/01
CPCG01K7/01
Inventor 冯纯益朱翔范伟力廖乾兰程福军袁尚琪
Owner 成都三零嘉微电子有限公司