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Power supply decoupling circuit

A technology of power supply and decoupling, which is applied in the direction of electrical components, adjustment of electrical variables, output power conversion devices, etc., can solve the problems of long signal jitter components, increase of total chip area, etc., and achieve shortened duration, reduced amplitude, and reduced Effect of Die Area

Active Publication Date: 2017-03-29
VIA ALLIANCE SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional design not only greatly increases the total chip area, but also produces a longer signal jitter component (Jitter Component) due to the larger RC constant

Method used

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Embodiment Construction

[0056] In order to make the objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are listed below, together with the attached drawings, for detailed description as follows.

[0057] figure 1It is a schematic diagram showing a power supply decoupling circuit (Power Supply Decoupling Circuit) 100 according to an embodiment of the present invention. The power supply decoupling circuit 100 can be applied in a mobile device, such as: a smart phone (Smart Phone), a tablet computer (Tablet Computer), or a notebook computer (Notebook Computer), which can include circuits and circuits power supply. The power supply decoupling circuit 100 includes a first operational amplifier (Operational Amplifier) ​​110, a capacitor C1, a source resistor (SourceResistor) RS and a stabilization circuit (Stabilization Circuit) RN. The first operational amplifier 110 has a positive input terminal, a negative input terminal and an ...

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Abstract

A power supply decoupling circuit includes an operational amplifier, a capacitor, a source resistor and a stabilization circuit. The operational amplifier has a positive input terminal, a negative input terminal and an output terminal, wherein the positive input terminal is coupled to a first reference potential, and the negative input terminal is coupled to a common supply node. The capacitor is coupled between the common supply node and the output terminal of the operational amplifier. The source resistor is coupled between a supply potential and the common supply node. The stabilizing circuit is coupled between the common supply node and a ground potential. When the potential level of the common supply node is lower than a second reference potential, the stabilizing circuit is used to stabilize the potential level of the common supply node. The common supply node is used to drive an external circuit, and uses the supply potential as a power supply for the external circuit. The invention can not only reduce the chip area occupied by the decoupling capacitor, but also increase the equivalent capacitance value of the decoupling capacitor and the like.

Description

technical field [0001] The present invention relates to a power supply decoupling circuit (Power Supply Decoupling Circuit), in particular to a power supply decoupling circuit including a decoupling capacitor (Decoupling Capacitor). Background technique [0002] Decoupling capacitors are used to decouple one part of a circuit from another. The noise generated by the circuit components is shunted through the decoupling capacitor, so the influence of the noise on other circuits can be reduced. Another name for the decoupling capacitor is the bypass capacitor (Bypass Capacitor), because it can be used to bypass (Bypass) the power supply or other high-impedance components of the circuit. [0003] A power supply decoupling circuit (Power Supply Decoupling Circuit) with decoupling capacitors usually occupies a larger area. As a typical example, nearly one-third of the chip area of ​​a traditional power supply decoupling circuit is used for the layout of the decoupling capacitor....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/56G05F1/46H02M3/158G05F1/00
Inventor 李永胜
Owner VIA ALLIANCE SEMICON CO LTD
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