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Voltage-stabilizing circuit and operation amplifying circuit

A technology for amplifying circuits and voltage stabilizing circuits, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., and can solve problems such as slow instantaneous response speed of signals and large output impedance

Inactive Publication Date: 2014-11-05
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the output impedance of the transconductance amplifier GM is very large, so when it is directly used to push the gate of PMOS MP0, because the gate of PMOS MP0 has a large parasitic capacitance, the signal transient response speed of the entire LDO voltage regulator (signal transient response) speed) will be relatively slow

Method used

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  • Voltage-stabilizing circuit and operation amplifying circuit
  • Voltage-stabilizing circuit and operation amplifying circuit
  • Voltage-stabilizing circuit and operation amplifying circuit

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Embodiment Construction

[0033] In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0034] For the convenience of description, elements having equivalent or similar functions will be denoted by the same reference numerals. Therefore, elements with the same reference number in different embodiments do not mean that the two elements are necessarily the same. The scope of the present invention should be determined based on the scope of the patent application.

[0035] figure 1 The LDO regulator is paired with the Figure 2a-2c After the buffer in , there will be a problem: the gate voltage variation of PMOSMP0 is not rail-to-rail. by Figure 2c The buffer in the example, even if the voltage V 1 high to follow the input power supply voltage V in Like, the gate voltage V g At best, it can only be pulled up to equal the supply...

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Abstract

The invention is used for providing a circuit of a regulated voltage. An output stage is provided with a power switch which is provided with a control end, a power input end and a power output end. The power input end is coupled with a power voltage; the power output end provides the regulated voltage; an amplifier stage is used for comparing a feedback voltage and a reference voltage, and is provided with a first output end and a second output end; the feedback voltage is approximately proportional to the regulated voltage; a buffer stage is provided with an input end and an output end; and the output end of the buffer stage and the second output end of the amplifier stage together drive the control end of the output stage.

Description

technical field [0001] The invention relates to a circuit and a control method, especially a circuit and a control method for amplifiers and voltage regulators. Background technique [0002] Many circuits require a relatively constant voltage in order to operate properly. These circuits are generally powered by an energy source, such as a main power or a battery. Unfortunately, the power supply's voltage tends to fluctuate wildly. Therefore, the industry needs to develop various regulator circuits to convert the output voltage of the energy supplier into a relatively stable fixed voltage for use by other circuits. [0003] A voltage converter for converting DC power into DC power is called a low dropout (LDO) voltage regulator. Low dropout regulators generally have a power switch, usually a field effect transistor, connected between the input supply and the output supply. Through the feedback mechanism, the channel impedance of the power switch is controlled to adjust th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 邱柏翰
Owner LEADTREND TECH