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Low dropout linear voltage regulator

A low-dropout linear regulator technology, applied in instruments, control/regulating systems, regulating electrical variables, etc., can solve the problem that low-dropout linear regulators cannot have both low static power consumption and high power supply noise suppression capability. , to achieve the effect of improving power supply ripple suppression capability, simple circuit implementation, and suppressing power supply ripple jitter

Inactive Publication Date: 2014-09-10
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is how to overcome the defect that the low static power consumption and high power supply noise suppression ability of the low dropout linear regulator in the prior art cannot be combined

Method used

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Embodiment Construction

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0018] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or elem...

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Abstract

The invention provides a low dropout linear voltage regulator which comprises an error amplifier, a first power device, a second power device and a common mode feedback circuit, wherein the error amplifier is a double-end input and double-end output full differential error amplifier, and is used for comparing a feedback voltage and a reference voltage to generate a residual signal and amplifying the residual signal; the first power device is used for supplying a load current to a load; the second power device is consistent with the first power device in structure, but with a reduced width to length ratio; and the common mode feedback circuit performs calculation according to a first common mode level supplied by the output end of the first power device, and a second common mode level and a reference voltage supplied by the output end of the second power device, and generates a common mode control signal and outputs the common mode control signal to the error amplifier. By adopting the low dropout linear voltage regulator provided by the invention, circuit symmetry is improved, jitter on a power supply can be converted into a common mode signal, so that the action of a common mode suppression circuit is more obvious, and the power supply ripple suppression ratio of the low dropout linear voltage regulator is further improved.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a low-dropout linear regulator. Background technique [0002] With the development of portable electronic products in the direction of smaller size and stronger performance, system-on-chip (SOC) has become the development direction of integrated circuits. Each module of a system-on-chip is powered by a separate linear regulator, and each linear regulator is shared A general power line, with the increase of the complexity of the system on chip and the increase of the operating frequency, the noise and clutter on the power line become more and more complicated, which affects the performance of the system on chip. Therefore, how to improve the power supply noise suppression ability has become a research hotspot of the low dropout linear regulator. [0003] For low dropout linear regulators (Low Drop Out Regulator, hereinafter referred to as LDO), the traditional way to improve po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 邹伟赵博杨华中
Owner TSINGHUA UNIV
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