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Band-gap reference source

A technology of reference source and power supply, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, etc., and can solve problems such as increasing the difficulty of designing bandgap reference sources

Active Publication Date: 2020-06-23
BYD SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Embodiment Construction

[0019] Specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0020] Before describing in detail the bandgap reference source according to the embodiments of the present disclosure, the basic principle of the bandgap reference source is briefly introduced.

[0021] The purpose of a bandgap reference is to establish a DC voltage or current with a defined temperature characteristic that is independent of the power supply and process. In addition to process, voltage, and temperature uncertainties, bandgap references are also concerned with power supply ripple rejection at low and high frequencies. Circuit noise and total power consumption are also major trade-offs in bandgap reference design.

[0022] The bandgap referen...

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Abstract

The invention relates to a band-gap reference source. The band-gap reference source comprises a band-gap reference source power supply generation circuit and a band-gap reference source core circuit.The band-gap reference source power supply generation circuit is used for generating a power supply required by the work of the band-gap reference source core circuit. The band-gap reference source core circuit is used for generating a reference voltage. The band-gap reference source power supply generation circuit comprises a P-type current source, an N-type current mirror, a P-type current mirror, a common-source circuit and a common-gate circuit. The current generated by the P-type current source sequentially flows through the N-type current mirror and the P-type current mirror and then isamplified, and the common-gate circuit and the common-source circuit form a negative feedback loop and are matched with the output of the P-type current mirror to supply power to the band-gap reference source core circuit.

Description

technical field [0001] The present disclosure relates to the technical field of electronic circuits, and in particular, to a bandgap reference source. Background technique [0002] figure 1 A schematic circuit diagram of an existing bandgap reference source is shown. In order to improve the power supply rejection ratio of the bandgap reference source and improve the problem of excessive noise of the Vref output power supply, the power supply VDDL of the bandgap reference source is provided through a voltage series negative feedback loop. The supply voltage VDDA remains relatively independent. In order to minimize the dependence of VR on the power supply, VR is generated by the core circuit of the bandgap reference source. This bandgap reference uses a resistor divider circuit. In the resistor divider circuit, in order to obtain a small DC power consumption current, the figure 1 The resistors R1 and R2 in the circuit are made very large, and the large resistors R1 and R2...

Claims

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Application Information

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IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor 张旭龙刘雄
Owner BYD SEMICON CO LTD
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