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Role of Capacitor [2]

Copyright. SAMSUNG ELECTRO-MECHANICS All rights reserved.

Noise Filtering caused by IC Switching

SAMSUNG Role of Capacitor [1] Overview of Capacitor Role [2] Noise Filtering caused by IC Switching [3] Noise Filtering caused by Converter Switching [4] Power Delivery Network

 

  

Noise Filtering caused by IC Switching

SAMSUNG Importance of Noise Filtering Variation of a power line can cause IC malfunction [Example] IC malfunction from the noise of the power line High Vout, Low Vout, Digital Signal, Noise in Power Line, Data Error, IC malfunction

 

  

Noise Filtering caused by IC Switching

SAMSUNG Filtering of IC Switching Noise (1) A power line without a capacitor can cause a high frequency noise [Simple Power Line without a capacitor], Load Current Assumption, Impedance of Simple Power Line, A high impedance at high frequency by L of PCB

 

  

Noise Filtering caused by IC Switching

SAMSUNG Filtering of IC Switching Noise (2) A Power line with a capacitor can decrease a high frequency noise [Simple Power Line with a Capacitor] Parasitic L & R of PCB, Load Current Assumption, Impedance of Simple Power Line, Reduce in impedance by an inserting capacitor

 

  

Noise Filtering caused by IC Switching

SAMSUNG Filtering of IC Switching Noise (3) A power line with many capacitors can reduce impedance effectively [Simple Power Line with Capacitors] As a great number of capacitors in power line can decrease the impedance level of power line, an electrical noise can be reduced.

 

  

Noise Filtering caused by IC Switching

SAMSUNG Filtering of IC Switching Noise (4) A capacitor near IC can also lower impedance [Simple Power Line with Capacitors and Parasitic Inductors] A low B value: 1nF capacitors is located near IC → The lower inductance B, the lower impedance of the power line at a high frequency [E.g.] LSC (Land Side Capacitor), Embedded Capacitor

 

  

Noise Filtering caused by IC Switching

SAMSUNG Filtering of IC Switching Noise (5) A sudden increase of current consumption cansues a voltage drop - A voltage drop point and a slop can vary from causes

 

  

Noise Filtering caused by IC Switching

SAMSUNG Filtering of IC Switching Noise (6) A capacitor can decrease voltage ripple caused by load variation [Voltage Ripple Comparison of capacitors between 'Without' and 'With' causes

 

Copyright. SAMSUNG ELECTRO-MECHANICS All rights reserved.

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