The switching of active devices on printed circuit boards (PCBs) can cause a momentary surge or drop in the power bus voltage. Decoupling capacitors are often utilized to alleviate this problem. They help to stabilize the power bus voltage by supplying transient current to active devices. The decoupling strategy, including where to place the high-frequency decoupling capacitors, is often a topic of debate. This paper examines the effect of decoupling capacitor placement on a 4-layer printed circuit board. Some design guidelines are provided.

Meeting Name

IEEE International Symposium on Electromagnetic Compatibility, 2000


Electrical and Computer Engineering

Keywords and Phrases

4-Layer Printed Circuit Board; PCB; Active Devices; Active Networks; Busbars; Capacitors; Decoupling Capacitor Placement; Decoupling Capacitors; Design Guidelines; Electromagnetic Coupling; High-Frequency Decoupling Capacitors; Power Bus Decoupling; Power Bus Voltage; Printed Circuit Layout; Surge; Transient Analysis; Transient Current

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2000 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Full Text Link