Role of Capacitor [2] |
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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
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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
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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
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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
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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.
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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
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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
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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. |