A high-order temperature-compensated bandgap reference circuit
A high-order temperature compensation and reference circuit technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve the problem of high output accuracy
Active Publication Date: 2020-05-12
SHANGHAI AWINIC TECH CO LTD
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[0007] In view of this, the present invention provides a high-order temperature-compensated bandgap reference circuit to solve the problem that the bandgap reference circuit in the prior art cannot guarantee high output accuracy in the full temperature range
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[0086] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0087] See figure 2 As shown, the high-order temperature compensation bandgap reference circuit provided in the embodiment of the present invention includes: a power supply VDD, a startup circuit 1, a bandgap reference core circuit 2, and a high-order temperature compensation circuit 3; the power supply is the startup circuit 1, the bandgap The reference core circuit 2 and the high-order temperature compensation circuit 3 provide electri...
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The invention provides a high-order temperature compensation band-gap reference circuit. The circuit includes a power supply, a startup circuit, a band-gap reference core circuit and a high-order temperature compensation circuit. The high-order temperature compensation circuit includes a temperature drift voltage sampling circuit, a high temperature section compensation circuit, a low temperaturesection compensation circuit and a temperature compensation output circuit. The high-order temperature compensation band-gap reference circuit superimposes the band-gap reference output voltage of theband-gap reference core circuit through the high temperature section compensation circuit and the low temperature section compensation circuit, thereby forming a four-order characteristic curve witha temperature characteristic voltage curve of the band-gap reference core circuit. The effect of high-order temperature compensation is generated on the voltage of the band-gap reference core circuit,and the problem that the traditional band-gap reference circuit is poor in temperature characteristic and low in output accuracy in the whole temperature range is solved.
Description
Technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a high-order temperature compensation band gap reference circuit. Background technique [0002] Bandgap reference circuit is one of the most common and important integrated circuit modules in analog integrated circuit design. Its function is to generate a stable voltage as a reference voltage and supply it to other modules as a reference voltage. The requirement for the reference voltage in integrated circuits is that the output precision is high, and the output voltage does not change with conditions such as temperature and technology. It can be seen that how to ensure that the output voltage value of the bandgap reference circuit has high accuracy, constant size, and small temperature-dependent characteristics is the key to the design of the bandgap reference circuit. [0003] Such as figure 1 As shown, figure 1 It is a schematic diagram of the structur...
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 董渊程剑涛王云松黄建刚吴传奎
Owner SHANGHAI AWINIC TECH CO LTD