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Bandgap Reference Voltage Generation Circuit

A technology of reference voltage and circuit generation, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., to achieve the effect of improving accuracy and reducing impact

Active Publication Date: 2020-10-27
NANJING ZGMICRO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

from figure 2 It can be seen in the figure that increasing the input offset voltage Vos of + / -5mv has an impact on the output value Vbg of + / -41mv, which is unacceptable in high-precision applications

Method used

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  • Bandgap Reference Voltage Generation Circuit
  • Bandgap Reference Voltage Generation Circuit
  • Bandgap Reference Voltage Generation Circuit

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Embodiment Construction

[0034] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0036] Please refer to image 3 As shown, it is a schematic circuit diagram of a bandgap reference voltage generating circuit in an embodiment of the present invention, which is in figure 1 Improvements are made on the basis of the traditional bandgap reference voltage generation circuit shown, and an offset voltage correct...

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Abstract

The invention provides a bandgap reference voltage production circuit. The circuit comprises a first polar type transistor, a second polar type transistor, a MOS tube, a first to a fourth resistors; an offset voltage correction circuit comprises a second operational amplifier, a first capacitor, a second capacitor, a first to a fourth switches; a first end of the second switch is connected with asecond node through a first switch, and a second end thereof is connected with a third node; a third switch is connected between the second node and a second input end of the second operational amplifier; the fourth switch is connected between the third node and a first input end of the second operational amplifier; the first input end of the second operational amplifier is grounded through the first capacitor, the second input end thereof is grounded through the second capacitor, and the output end thereof is connected with a control end of the MOS tube; a first input end and a second input end of the operational amplifier are connected with the second end and the first end of the second switch, and the output end thereof is connected with the control end of the MOS tube. Compared with the prior art, the offset voltage correction circuit is added in the production circuit so as to correct the input offset voltage.

Description

【Technical field】 [0001] The invention relates to the technical field of reference voltages, in particular to a bandgap reference voltage generating circuit. 【Background technique】 [0002] The bandgap reference voltage generation circuit in the chip inevitably has an offset voltage. The offset voltage is mainly caused by the uncertainty of the manufacturing process and the mechanical stress after packaging, which greatly affects the accuracy of the output voltage. Through good layout design, such as increasing the size of the input stage of the op amp and matching design between the tubes, the offset voltage can be reduced to a certain extent, but this will increase the layout area, increase the parasitic capacitance, and slow down the working speed. , and the offset voltage can only be reduced and cannot be completely eliminated. As the market has higher and higher requirements for voltage accuracy, it is necessary to design a special circuit to offset the influence of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/625
CPCG05F1/625
Inventor 姜伟常星王钊
Owner NANJING ZGMICRO CO LTD
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