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Low-voltage-difference voltage-stablizer

A technology of low-dropout linearity and voltage regulators, which is applied in the direction of instruments, control/regulation systems, and regulation of electrical variables, etc. It can solve the problems that LDO circuits cannot simultaneously achieve high output voltage accuracy, high stability, and high power supply voltage rejection ratio. To achieve the effect of overcoming the reduction of system stability, low output noise, and ensuring stability

Inactive Publication Date: 2008-02-13
BEIJING MXTRONICS CORP +2
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Problems solved by technology

[0017] The problem solved by the technology of the present invention is: aiming at the shortcomings that the existing LDO circuit cannot realize high output voltage accuracy, high stability, and high power supply voltage rejection ratio at the same time, by introducing a filter circuit module with variable transconductance in the LDO circuit, Provides a low-dropout linear regulator circuit with high precision, high stability and high PSRR

Method used

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Embodiment Construction

[0044] FIG. 5 shows a schematic block diagram of a typical LDO of the present invention. The LDO is composed of a voltage reference circuit 101, an error amplifier 102, a variable transconductance filter circuit module 302, a variable current high-gain amplifier stage 103 (the current flowing through this stage increases with the increase of the LDO load current), a power tube 104 , a voltage dividing sampling network 105 , an output capacitor 106 and a load 107 . The difference between it and the circuit shown in FIG. 3 is that the fixed current high gain amplifier stage 109 is replaced by the variable current high gain amplifier stage 103, and between the output terminal of the error amplifier 102 and the input terminal of the variable current high gain amplifier stage 103 A variable transconductance filter circuit module 302 is added between them.

[0045] The filter circuit module 302 of the variable transconductance is made up of the transconductance stage gm of the vari...

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Abstract

A low voltage difference linear voltage regulator realizes the performance targets such as high output voltage precision, high stability and high supply-voltage rejection ratio by using variable slope gm / C filter circuit module at the output terminal of error amplifier. Variable slope mechanism of the filter circuit module reduces static power consumption of the voltage regulator when the regulator is ideal loaded or light loaded, and produces a parasitic pole whose frequency goes to high when the regulator load voltage increases, accordingly to develop unit gain band width of the voltage regulator and strengthen stability of the heavy loaded or full loaded voltage regulator. Moreover, variable current high-gain amplifier stage used in voltage circuit increases slew rate of voltage regulator internal node and improves interaction capability of the voltage regulator.

Description

technical field [0001] The invention relates to a low-dropout linear regulator, in particular to a variable transconductance gm / C filter circuit module and a variable current high-gain amplifier stage to achieve high stability, high precision, high power supply voltage rejection ratio, and fast response low dropout linear regulator. Background technique [0002] The power management circuit is one of the important modules in portable electronic applications, and it usually includes a switching power supply circuit and a low-dropout voltage regulator (LDO, Low-Dropout Voltage Regulator) circuit. The conversion efficiency of the switching power supply circuit can usually reach more than 90%, but its chip area is large, the output voltage ripple is large, and it needs to use magnetic components; while the LDO circuit has the characteristics of small chip area and small output voltage ripple, so it is widely used For powering high-performance analog circuits. [0003] High-per...

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Application Information

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IPC IPC(8): G05F3/16
Inventor 沈良国严祖树赵元富张兴
Owner BEIJING MXTRONICS CORP
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