Pre-regulator circuit capable of increasing band-gap reference power supply rejection ratio

A reference voltage and reference power supply technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as limited improvement capabilities

Inactive Publication Date: 2016-07-20
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cascode structure can improve the power supply rejection rati

Method used

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  • Pre-regulator circuit capable of increasing band-gap reference power supply rejection ratio

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Example Embodiment

[0011] like figure 1 Shown, a kind of pre-stabilizing circuit that improves the rejection ratio of bandgap reference power supply includes a start-up circuit, a PTAT current circuit and a bandgap reference voltage generating module, the start-up circuit is electrically connected with the PTAT current circuit, and the PTAT current circuit includes PMOS transistor M5, PMOS transistor M6, PMOS transistor M7, PMOS transistor M8, transistor Q1, transistor Q2 and resistor R1; the bandgap reference voltage generation module includes PMOS transistor M9, NMOS transistor M10, PMOS transistor M11, PMOS transistor M12, NMOS tube M13, NMOS tube M14 and NMOS tube M15; among them, transistor Q1, PMOS tube M5, PMOS tube M6, PMOS tube M7, PMOS tube M8, PMOS tube M9, PMOS tube M11, PMOS tube M12, NMOS tube M13, NMOS Tube M14 and NMOS tube M15 form a negative feedback loop, while transistor Q2, resistor R1, PMOS tube M6, PMOS tube M8, PMOS tube M9, PMOS tube M11, PMOS tube M12, NMOS tube M13, N...

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Abstract

The invention discloses a pre-regulator circuit capable of increasing band-gap reference power supply rejection ratio. The pre-regulator circuit comprises a starting circuit, a PTAT current circuit and a band-gap referent voltage generating module, wherein the PTAT current circuit comprises a PMOS transistor M5, a PMOS transistor M6, a PMOS transistor M7, a PMOS transistor M8, a transistor Q1, a transistor Q2 and a resistor R1; the band-gap reference voltage generating module comprises a PMOS transistor M9, an NMOS transistor M10, a PMOS transistor M11, a PMOS transistor M12, an NMOS transistor M13, an NMOS transistor M14 and an NMOS transistor M15. The pre-regulator circuit has the advantages that part of the noise fluctuation of power supply voltage is removed through the pre-regulator technology, the pre-regulated voltage is used as the band-gap reference power supply voltage to increase the power supply rejection ratio of the circuit, a negative feedback method is used to increase the impedance from VOUT to power supply voltage in the pre-regulator technology, and the power supply rejection ratio is further increased.

Description

technical field [0001] The invention relates to a pre-stabilizing circuit for improving the rejection ratio of a bandgap reference power supply. Background technique [0002] Any electronic product needs power supply. With the rapid development of the information industry, there are more and more portable products, such as mobile phones, tablet computers, and wearable devices, which have higher and higher requirements for the stability of the power supply. The stability of the power supply directly affects the performance of the product. With the increasing number of integrated components in radio frequency integrated circuits, the number of noise coupling sources is also increasing. When the power supply voltage is disturbed and fluctuates, it is expected that the output voltage will remain stable. This requires that the bandgap reference voltage that provides the voltage reference for it has high power supply rejection. Compare. The main solution to improve the power sup...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/562
Inventor 唐杰章国豪陈忠学黄敬馨余凯
Owner GUANGDONG UNIV OF TECH
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