Fast transient response bandgap reference circuit with high power supply rejection ratio

A reference circuit and reference technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of low power supply rejection, slow transient response speed, etc., to improve power supply rejection ratio, speed up, and improve load regulation rate effect

Inactive Publication Date: 2018-02-02
刘阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of slow transient response speed and low power supply rejection in the above-mentioned bandgap reference circuit. The problem of low power supply rejection ratio of traditional bandgap reference circuit

Method used

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  • Fast transient response bandgap reference circuit with high power supply rejection ratio
  • Fast transient response bandgap reference circuit with high power supply rejection ratio
  • Fast transient response bandgap reference circuit with high power supply rejection ratio

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0020] A bandgap reference circuit with fast transient response and high power supply rejection ratio such as figure 2 As shown, it includes an expanded bandgap reference core circuit (Bandgap Core), an error amplifier (Error Amplifier), and a voltage pre-regulator circuit (Pre-regulator).

[0021] The bandgap reference core circuit includes transistors Q1, Q2, MOS transistor M5, resistors R1, R2, R3, R4, R5. The emitter of the first triode Q1 is grounded, its collector is connected to the base of the second triode Q2, and its base is connected to its own collector through the fourth resistor R4; the emitter of the second triode Q2 Connect to the ground through the fifth resistor R5, its base is connected to the collector of the first transistor Q1, and its collector is connected to the base of the third transistor Q3; the gate of the fifth MOS transis...

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Abstract

The invention belongs to the technical field of analog integrated circuits, and relates to a bandgap reference circuit with fast transient response and high power supply rejection ratio, including a bandgap reference core circuit (Bandgap Core), an error amplifier (Error Amplifier), a voltage pre-adjustment circuit ( Pre-regulator). Technically, the dual-loop control strategy combining the Widlar reference and the Kuijk reference is mainly used to improve the load regulation rate and transient response speed; in addition, the present invention also introduces the voltage pre-adjustment technology, which effectively realizes the traditional bandgap Improvement of reference circuit power supply rejection ratio.

Description

technical field [0001] The invention belongs to the field of analog integrated circuit design, and relates to a double-loop control strategy and voltage pre-adjustment technology applied to a bandgap reference circuit. Background technique [0002] In LDO and switching power supply, the bandgap reference is the core part of the circuit and provides an important reference for the whole circuit. A small change in the reference will cause a huge deviation of the entire system, so the anti-disturbance ability of the bandgap reference becomes an important indicator of the bandgap reference . When the load at the reference is disturbed, the reference is required to respond quickly and correct the deviation of the reference voltage back immediately. [0003] In the SOC, if the transient response of the power supply is slow, there will be situations where the power supply cannot respond to the transient of the digital signal in time, which requires that the load transient response ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 刘阳
Owner 刘阳
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