Power supply decoupling circuit

A power supply and decoupling technology, applied in electrical components, adjusting electrical variables, output power conversion devices, etc., can solve the problems of increasing the total chip area, long signal jitter components, etc., to reduce the amplitude, shorten the duration, increase the Effect of Equivalent Capacitance Value

Active Publication Date: 2016-02-03
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 (JitterComponent) due to the larger RC constant

Method used

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Examples

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Embodiment Construction

[0056] In order to make the purpose, 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 (PowerSupplyDecouplingCircuit) 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 (SmartPhone), a tablet computer (Tablet Computer), or a notebook computer (Notebook Computer), which may include circuits and power supplies for the circuits. 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...

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PUM

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Abstract

The invention relates to a power supply decoupling circuit. The power supply decoupling circuit comprises an operational amplifier, a capacitor, a source resistor and a stabilizing circuit. The operational amplifier is provided with a positive input end, a negative input end and an output; the positive input end is coupled with a first reference potential; the negative input end is coupled with a common supply node; the capacitor is coupled between the common supply node and an output end 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 grounding potential; when the potential level of the common supply node is lower than a second reference potential, the stabilizing circuit is used for stabilizing the potential level of the common supply node; and the common supply node is used for driving an external circuit and takes the supply potential as power supply for the external circuit. The power supply decoupling circuit can not only reduce the chip area occupied by the coupling capacitor, but also can increase the equivalent capacitance of the coupling capacitor.

Description

technical field [0001] The present invention relates to a power supply decoupling circuit (PowerSupplyDecouplingCircuit), in particular to a power supply decoupling circuit including a decoupling capacitor (DecouplingCapacitor). Background technique [0002] Decoupling capacitors (Decoupling Capacitor) are used to decouple one part of the circuit from another part. 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 (PowerSupplyDecouplingCircuit) with a decoupling capacitor usually occupies a large 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(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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