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Low-dropout linear voltage stabilizer based on self-adaptive zero compensation

A low-dropout linear and zero-point compensation technology, which is applied to instruments, electrical variable adjustment, control/regulation systems, etc., to achieve the effect of improving loop stability and maintaining loop stability

Pending Publication Date: 2019-01-01
上海海栎创科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the present invention proposes a low-dropout linear voltage regulator based on adaptive zero point compensation to solve the loop stability problem of the low-dropout linear voltage regulator in the range from zero load current to full load current

Method used

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  • Low-dropout linear voltage stabilizer based on self-adaptive zero compensation
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  • Low-dropout linear voltage stabilizer based on self-adaptive zero compensation

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Embodiment 1

[0028] The present invention proposes a low dropout linear voltage regulator based on adaptive zero point compensation, such as figure 2 As shown, it includes a reference voltage circuit, an error amplifier, a series regulator MPO, and a feedback network composed of a first resistor R1 and a second resistor R2. The inverting input of the error amplifier is connected to the reference voltage circuit, and its non-inverting input is connected to the first One end of the first resistor R1 and one end of the second resistor R2, the output end of which is connected to the gate end of the series adjustment transistor MPO, the source end of the series adjustment transistor MPO is connected to the power supply VIN, and the drain end of the series adjustment transistor MPO is connected to the stable The voltage regulator output terminal VOUT, the other end of the first resistor R1 is connected to the drain end of the series regulator transistor MPO, and the other end of the second resis...

Embodiment 2

[0044] The embodiment of the present invention provides a technical solution: different from embodiment 1, such as Figure 4 Said, the adaptive compensation control circuit includes a fourth PMOS transistor MP4, a fifth PMOS transistor MP5, a third NMOS transistor MN3 and a resistor R0, the drain terminal and the gate terminal of the fourth PMOS transistor MP4 are connected and connected to the The drain end of the third NMOS transistor MN3 is connected, the gate end of the fifth PMOS transistor MP5 is connected to the gate end of the fourth PMOS transistor MP4, and its drain end is respectively connected to one end of the resistor R0 and the second NMOS transistor MP5. The drain end of the transistor MN2 is connected to the gate end of the first PMOS transistor MP1, and the other end of the resistor R0 is grounded, wherein the source terminals of the fourth PMOS transistor MP4 and the fifth PMOS transistor MP5 are connected to a power supply , the source end of the third NMOS...

Embodiment 3

[0048] The embodiment of the present invention provides a technical solution: different from embodiment 1, for the situation of VOUT=VREF in embodiment 1, it can be seen that R1=0, that is, no resistor R1 is needed, only one resistor R2 is needed, but further , considering the actual cost of resistors and process requirements, in the embodiment of the present invention, such as Figure 5 As shown, an NMOS transistor MN0 is used to replace the second resistor R2. Then the low dropout linear regulator further includes a bias circuit and an NMOS transistor MN0 that can be used as an output load, the bias circuit includes a bias current source IB, a fourth NMOS transistor MN4, and the bias current source IB The input terminal is connected to the power supply, the output terminal is connected to the drain terminal of the fourth NMOS transistor MN4, the drain terminal of the fourth NMOS transistor MN4 is connected to the gate terminal, and the source terminal is grounded, the gate t...

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Abstract

The invention belongs to the field of the integrated circuit design, and especially relates to a low-dropout linear voltage stabilizer based on self-adaptive zero compensation. The low-dropout linearvoltage stabilizer comprises a reference voltage circuit, an error amplifier, a serial adjusting pipe and a feedback network composed of a first resistor and a second resistor, and further comprises aload current induced circuit, a self-adaptive compensation control circuit, a zero-setting resistor connected with a drain terminal of the serial adjusting pipe and a compensation capacitor connectedwith a grid terminal of the serial adjusting pipe; the load current induced circuit samples load current, the self-adaptive compensation control circuit produces voltage for controlling the zero-setting resistance by using the sampled current, the zero-setting resistance value dynamically follows the change of the load current, thereby realizing the change, following the output pole, of the related zero point, acquiring self-adaptive frequency compensation, and improving loop stability of the voltage stabilizer; therefore, under the condition of not increasing relatively large static power consumption and compensation capacitance, the low-dropout linear voltage stabilizer can maintain the loop stability in the wide load current range.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, in particular to a low-dropout linear regulator based on self-adaptive zero point compensation. Background technique [0002] Due to its simple structure, small size, few peripheral components, low power consumption, and small output ripple, low-dropout linear regulators are widely used in SoC design to supply power to different functional modules. Such as figure 1 As shown, a typical low-dropout voltage regulator is generally composed of a reference voltage circuit, an error amplifier, a feedback network composed of a series regulator MPO and resistors R1 and R2, where CL and IL connected to the output terminal of the voltage regulator represent the output of the voltage regulator respectively. terminal load capacitance and load current. [0003] Low-dropout linear regulators are usually used as power supplies, and their load current has a large range of variation, resulting in large c...

Claims

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Application Information

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IPC IPC(8): G05F1/565
CPCG05F1/565
Inventor 卢昌鹏刘华王建军
Owner 上海海栎创科技股份有限公司
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