Band-gap reference circuit integrating over-temperature protection and resistance trimming protection functions
A technology of protection function and reference circuit, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of the circuit failing to meet the accuracy requirements and affecting the output, etc.
Inactive Publication Date: 2022-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0004] However, due to the influence of manufacturing process and other factors, when the temperature of the bandgap reference voltage circuit exceeds the range that the circuit can withstand, the characteristics of the transistors in the circuit may change, thereby affecting the output and making the circuit fail to meet the accuracy requirements
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[0019] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0020] The present invention proposes a bandgap reference circuit integrating over-temperature protection and resistance trimming and protection functions. The overall circuit diagram is as follows figure 1As shown, it includes the bandgap reference main circuit, over-temperature protection circuit, and resistance trimming protection circuit. The main circuit converts the power supply voltage signal into a stable bandgap reference voltage and outputs it to the over-temperature protection circuit; the over-temperature protection circuit receives the bandgap reference voltage signal output by the main circuit. The temperature protection circuit is repeatedly turned on and off due to small disturbances at the temperature critical point; the resistance trimming protection circuit of the bandgap reference can prevent the circuit from being broken...
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The invention discloses a band-gap reference circuit integrating over-temperature protection and resistance trimming protection functions. The band-gap reference circuit comprises a band-gap reference main body circuit, an over-temperature protection circuit and a resistance trimming protection circuit. The main body circuit converts a power supply voltage signal into a stable band-gap reference voltage and outputs the stable band-gap reference voltage to the over-temperature protection circuit; the over-temperature protection circuit receives a band-gap reference voltage signal output by the main body circuit, and the over-temperature protection circuit has a hysteresis characteristic, so that the over-temperature protection circuit can be prevented from being repeatedly turned on and turned off at a temperature critical point due to small disturbance; the band-gap reference resistance trimming protection circuit can prevent the circuit from being broken down by trimming high-voltage signals.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to a bandgap reference circuit integrating over-temperature protection and resistance trimming protection functions. Background technique [0002] The most common way for circuitry to interface with the real analog world is through the use of analog-to-digital converters (ADCs), sensors, or other application-specific integrated circuits (ASICs). The premise of accurate measurement is a reference voltage that does not fluctuate with the system, and it should not be affected by conditions such as input voltage or ambient temperature. The bandgap reference provides a stable voltage against which other circuit blocks are measured and compared with the required accuracy. [0003] The basic principle of the bandgap reference circuit is to add two voltages with opposite temperature coefficients with appropriate weights, and finally obtain a reference voltage with zero temperature coeffi...
Claims
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 翟亚红曹飞飞廖文倩王健竹李威
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA