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Role of Capacitor [2]
Copyright. SAMSUNG ELECTRO-MECHANICS All rights reserved. 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 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 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 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 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. 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 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 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.