A circuit and device for detecting the junction temperature of a reference voltage bjt tube

A technology for detecting benchmarks and saving temperature, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as large temperature value errors, damaged circuits, etc., and achieve the effect of protecting chips

Active Publication Date: 2021-11-16
ETOWNIP MICROELECTRONICS BEIJING CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] The chip in the circuit will continue to emit heat during work, which will cause the circuit temperature to be too high and damage the circuit
In the prior art, the temperature detection device is mainly used for detection, and the temperature value obtained by this method has a large error

Method used

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  • A circuit and device for detecting the junction temperature of a reference voltage bjt tube
  • A circuit and device for detecting the junction temperature of a reference voltage bjt tube
  • A circuit and device for detecting the junction temperature of a reference voltage bjt tube

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Embodiment Construction

[0022] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] A circuit for detecting the junction temperature of a reference voltage bjt tube provided by the present invention comprises: transistors MP1, MP2 and MP3, triodes PNP1 and PNP2, resistors R1, R2, R3, R4, R5, R6 and R7, operational amplifier op, comparison tor comp, switches S1 and S2. For specific connections, see figure 1 : The base o...

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Abstract

A circuit for detecting the junction temperature of the reference voltage bjt tube provided by the present invention includes: the base of PNP1 is connected to the base of PNP2 to ground, the emitter of PNP1 is connected to the first end of R4; the second end of R4 and the second end of R3 are connected to the drain of MP1 pole; the first end of R3 and the second end of R1 are connected to the first input end of OP; the emitter of PNP2 and the second end of R5 are connected to the drain of MP2; the first end of R5 and the second end of R2 are connected to the second input end of OP; MP1 gate, MP2 gate and MP3 gate are all connected to OP output terminal; MP1 source, MP2 source and MP3 source are connected to power supply VDD; MP3 drain is connected to the second terminal of R6; R2 first terminal, PNP2 collector , The collector of PNP1 and the first terminal of R1 and the first terminal of R7 are connected to the circuit ground GND; the first terminal of R6 and the second terminal of R7 are connected to the negative terminal of the comparator; the voltage VBE1 between the base and emitter of PNP1 is transmitted through the switch S1 To the positive terminal VBE2 of the comparator; the output signal temp_o of the comparator is connected to the test pad through S2. The invention can indicate the junction temperature working temperature of the BJT tube, thereby indicating and alarming the temperature of the chip.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a circuit and a device for detecting the junction temperature of a reference voltage bjt tube. Background technique [0002] The chip in the circuit will continuously emit heat during operation, which will cause the circuit temperature to be too high and damage the circuit. In the prior art, the detection is mainly performed by a temperature detection device, and the temperature value obtained by this method has a large error. [0003] At present, the bandgap reference circuit, as an important component module of the integrated circuit chip, is widely used in various types of SOC chips. The bandgap reference module can provide the required reference voltage and reference current for the system. The bandgap reference module is a basic module and a subunit of the SOC chip. The general working range of the bandgap reference module can work at -40°-125°. Si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 丁玲朱敏
Owner ETOWNIP MICROELECTRONICS BEIJING CO LTD
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