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

Method used

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

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Example Embodiment

[0027] [Example 1]

[0028] The present invention proposes a low-dropout linear regulator based on adaptive zero 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 the non-inverting input is connected to the first resistor. One end of a resistor R1 and one end of a second resistor R2, the output end of which is connected to the gate end of the series regulator MPO, the source end of the series regulator MPO is connected to the power supply VIN, and the drain end of the series regulator MPO is connected to the stable The other end of the first resistor R1 is connected to the drain end of the series regulator MPO, and the other end of the second resistor R2 is grounded.

[0029] Please continue to refer figure 2 , The low-dropout linear...

Example Embodiment

[0043] [Example 2]

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

Example Embodiment

[0047] [Example 3]

[0048] The embodiment of the present invention provides a technical solution: the difference from embodiment 1 is that for the case of VOUT=VREF in embodiment 1, it can be seen that R1=0, that is, no resistor R1 is required, only one resistor R2 is required, but further , Taking into account the actual cost and process requirements of the resistor, in the embodiment of the present invention, such as Figure 5 As shown, an NMOS tube MN0 is used to replace the second resistor R2. The low dropout linear regulator also includes a bias circuit and an NMOS tube MN0 that can be used as an output load. The bias circuit includes a bias current source IB, a fourth NMOS tube 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 tube MN4, the drain terminal of the fourth NMOS tube MN4 is connected to the gate terminal, and the source terminal is grounded. The gate...

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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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