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Band Gap Reference Source

A reference source and power supply technology, which is applied in the direction of instruments, control/regulation systems, and electrical variable adjustment, can solve the problems of increasing the difficulty of bandgap reference source design, and achieve good power supply ripple suppression, low power consumption, and circuit structure simple effect

Active Publication Date: 2022-02-15
BYD SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is equivalent to transferring the design difficulty to the operational amplifier opa, and the design of the operational amplifier needs to weigh various design indicators and application requirements, thus increasing the design difficulty of the bandgap reference source

Method used

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  • Band Gap Reference Source
  • Band Gap Reference Source
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Embodiment Construction

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be understood that the specific embodiments described herein are intended to illustrate and explain the disclosure and is not intended to limit the disclosure.

[0020] The basic principles of the band gap base source are briefly described in detail before the band gap base sources of the present disclosure.

[0021] The purpose of the bandgap reference is to establish a DC voltage or current that is independent of the power supply and the process, with determining temperature characteristics. In addition to the uncertainty of process, voltage and temperature, the band gap reference also cares about the power ripple suppression capability of low frequency sections and high frequency sections. Circuit noise and total power consumption is also the main indicator of the proportional design of the bandgap.

[0022] The bandgap reference is a PN pin-forward direction to the PN pin having a negative temperature character...

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Abstract

The present disclosure relates to a bandgap reference source, which includes a bandgap reference source power generation circuit and a bandgap reference source core circuit, wherein the bandgap reference power generation circuit is used to generate the bandgap reference The power supply required for the work of the source core circuit, the bandgap reference source core circuit is used to generate a reference voltage, and the bandgap reference source power generation circuit includes a P-type current source, an N-type current mirror, a P-type current mirror, a common source stage circuit and a common gate circuit, wherein: the current generated by the P-type current source flows through the N-type current mirror and the P-type current mirror in sequence and then amplifies, and the common-gate stage circuit and the common-source stage The circuit forms a negative feedback loop and cooperates with the output of the P-type current mirror to provide power for the core circuit of the bandgap reference source.

Description

Technical field [0001] The present disclosure relates to the technical field of electronic circuitry, and in particular, to a band gap based source. Background technique [0002] figure 1 A circuit diagram of an existing bandgap reference source is shown. In order to improve the power suppression ratio of the bandgap reference source, the problem of excessive VREF output power supply is improved. The power supply VDDL of the band gap reference source is provided through a voltage series negative feedback loop, and the local power supply VDDL and global power supply VDDL and global The power supply voltage VDDA remains relatively independent. In order to minimize VR, VR is reduced from the power supply, VR is generated by the band gap reference source core circuit. The band gap reference source uses a resistance division circuit. In the resistor voltage dividing circuit, in order to obtain a small DC power current, it is often figure 1 The resistors R1 and R2 are made large, whil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor 张旭龙刘雄
Owner BYD SEMICON CO LTD
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