Ultralow temperature coefficient band-gap reference circuit based on mixed-mode high-order compensation

A high-order compensation and mixed-mode technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of large chip footprint, high process sensitivity, complex compensation structure, etc., and achieve high power supply rejection ratio, The effect of high process stability and low temperature coefficient

Active Publication Date: 2010-11-10
无锡市晶源微电子股份有限公司
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Problems solved by technology

Conventional high-order temperature compensation generally uses the superposition control of multiple compensation currents. Not only is the compensation structure complex, the chip occupies a large area, and the process sensitivity is high, it cannot overcome the influence of process drift on circuit performance. The

Method used

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  • Ultralow temperature coefficient band-gap reference circuit based on mixed-mode high-order compensation
  • Ultralow temperature coefficient band-gap reference circuit based on mixed-mode high-order compensation
  • Ultralow temperature coefficient band-gap reference circuit based on mixed-mode high-order compensation

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Embodiment Construction

[0016] The implementation of the present invention is divided into three parts, namely: (1) high-order compensation technology of mismatch control, (2) self-adaptive high-order section compensation technology, and (3) mixed mode high-order compensation technology. Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0017] T-I Compensation: A Higher Order Compensation Technique for Mismatch Control

[0018] figure 1 In , regardless of the temperature regulation circuit, if the current mirror in the reference current generation circuit is completely matched, and the currents in the two branches Q0 and Q1 are equal, then the first-order linear bandgap reference can be obtained as:

[0019] V ref _ I = V EB 4 + V T ...

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Abstract

The invention publishes an ultralow temperature coefficient band-gap reference circuit based on mixed-mode high-order compensation, which comprises a band-gap reference current generating circuit, a feedback control loop, a temperature regulating circuit and an output circuit, wherein the band-gap reference current generating circuit comprises four PMOS (P-channel Metal Oxide Semiconductor) pipes, two NMOS (N-Mental Oxide Semiconductor) pipes, two resistors and two PNP (Plug-and-Play) triodes, the feedback control loop comprises two PMOS pipes, two NMOS pipes and two PNF (Power Noise Filter) triodes, the temperature regulating circuit comprises two NMOS pipes, and the output circuit comprises two PMOS pipes, four resistors and a PNP triode. The circuit has lower temperature coefficient, higher power supply rejection ratio and higher process stability.

Description

technical field [0001] The invention relates to a high-order temperature compensation bandgap reference circuit, in particular to a mixed-mode high-order temperature compensation bandgap reference circuit, which belongs to the technical field of analog circuits. Background technique [0002] The voltage or current reference circuit can provide the system with a voltage or current source that does not vary with temperature and power supply, and the influence and effect of reference accuracy on system performance are becoming more and more significant. Bandgap references are widely used because of their low temperature coefficient, high power supply rejection ratio, and compatibility with traditional CMOS processes. [0003] The existing voltage-mode bandgap reference is within the temperature range of -40°C to 125°C. After the first-order linear compensation, the temperature coefficient can be reduced to within 10ppm / °C, and the high-order temperature compensation can further...

Claims

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Application Information

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IPC IPC(8): G05F3/30
Inventor 聂卫东吴金朱伟民李浩景苏鹏尹岱盛慧红渠宁
Owner 无锡市晶源微电子股份有限公司
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