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Linear voltage regulator integrating reference and operational amplifier

A linear regulator, two-in-one technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as large static power consumption, achieve simple circuit, optimal combination, and save bias current Effect

Active Publication Date: 2022-03-01
江苏长晶科技股份有限公司
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Problems solved by technology

[0003] The problem to be solved by the present invention is: the circuit structure of the linear voltage regulator includes a reference circuit and an operational amplifier circuit at the same time, and there is a problem that the static power consumption is relatively large. Still has static power issues and increases circuit cost

Method used

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  • Linear voltage regulator integrating reference and operational amplifier

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Embodiment Construction

[0014] The implementation of the present invention will be described below with reference to the accompanying drawings.

[0015] figure 1 It is a traditional linear regulator circuit structure, including a reference circuit VREF, EA is an error amplifier, that is, a method circuit, P1 is an enhanced PMOS field effect transistor, which is an output power tube, and R1 and R2 are feedback resistors.

[0016] exist image 3 In the traditional depletion mode reference circuit shown, ND1 is a depletion mode NMOS field effect transistor, and NE1 is an enhancement mode NMOS field effect transistor. Although the gate of ND1 is connected to the source electrode, and the substrate is connected to the source electrode, The gate and drain of the enhancement tube NE1 are connected. The reference voltage Vref with zero temperature coefficient is formed by connecting the drain tube and the enhancement tube in series, and adjusting the size ratio of ND1 and NE1.

[0017] Figure 4 It is a ...

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Abstract

According to the reference and operational amplifier integrated linear voltage regulator, a depletion tube is introduced, and the depletion tube reference is used as the reference and the first stage of the operational amplifier, so that the operational amplifier and the reference are integrated, a starting circuit is not needed, the circuit is very simple, and the circuit performance is greatly improved on the basis of realizing the circuit performance of the linear voltage regulator. The depletion reference is used as a reference and a first stage of the operational amplifier, so that the static power consumption of low-power application can be obviously improved, and the optimal combination of performance and cost is realized.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and relates to a linear regulator for power management, which is a linear regulator combining a reference and an operational amplifier into one. Background technique [0002] With the widespread use of portable electronic products in all aspects of work and life, higher requirements are placed on the performance of the power supply, especially the low power consumption performance of the system. Traditional linear regulators can provide excellent anti-power interference capability and are widely used in circuit design, such as figure 1 As shown, since both the reference circuit and the op amp circuit must be included in the architecture, this structure usually brings other problems, such as the fact that both the reference circuit and the op amp circuit need to consume current, resulting in high static power consumption, which will limit the Battery life reduces the operating time of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 杨国江王海波
Owner 江苏长晶科技股份有限公司
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