Linear voltage stabilizer with self-adaptive enhanced power supply suppression

Abstract

The invention discloses a linear voltage stabilizer with self-adaptive enhanced power supply suppression, which consists of a base voltage module, an adaptive enhancement EA module, a PMOS power tube,two voltage sharing feedback resistors and a load impedance. The input end of the linear voltage stabilizer is respectively connected with the source electrodes of the base voltage module and the power tube MP. The output end of the base voltage module is connected with the NP end of the adaptive enhancement EA module. The voltage sharing feedback resistors are connected in series and are connected with the load impedance in parallel. One end point of the parallel connection is grounded and the other end point is connected with the drain electrode of the power tube MP as the output end of thelinear voltage stabilizer. The voltage sharing node is connected with the NF end of the adaptive enhancement EA module. The output end of the self-adaptive enhancement EA module is connected with thegrid electrode of the power tube MP. The adaptive PSRR characteristic enhancement technology presented by this invention enables the loop main poles to change with the output poles adaptively according to the LDO load condition. Meanwhile, the loop is kept stable by utilizing the dynamic zero tracking technology and the higher PSR characteristic is kept in a wider frequency range.

Description

technical field [0001] The invention relates to a high-precision system designed voltage conversion module, in particular to an adaptive PSR enhanced low-dropout linear voltage regulator. Background technique [0002] In the design of high-precision systems, not only the power supply is required to have high initial precision and high precision, but also the voltage is required to have a strong suppression effect on the medium and high frequency noise on the power supply. Especially in fields such as video surveillance and communication systems, the requirements for power supply voltage are more stringent. As a commonly used voltage conversion module, the LDO module has a very common application in high-precision systems. Therefore, it is very meaningful to realize a high-PSR LDO design. This paper proposes a LDO design with adaptive PSR enhancement technology, which can meet this requirement well. LDO architecture such as figure 1 As shown, it is composed of reference v...

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Problems solved by technology

[0007] However, it is not difficult to find that some of the new architectures proposed by the low-dropout linear regulators that increase the low-frequency gain and improve the PSRR characteristics have more or less limitations in one or more aspects, and cannot comprehensively and reliably enhance the low-dropout linear regulator. The PSR performance of the compressor

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