Stub vs. Capacitor for Power Supply Noise Reduction

Toru NAKURA
Makoto IKEDA
Kunihiro ASADA

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.1    pp.125-132
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.1.125
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
stub,  decoupling capacitor,  power supply noise,  di/dt noise,  IR drop,  

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Summary: 
This paper compares a stub and a decoupling capacitor for power supply noise reduction. A quarter-length stub attached to the power supply line of an LSI chip works as a band-eliminate filter, and suppresses the power supply bounce of the designed frequency. The conditions where the stub is more effective than the same-area decoupling capacitor are clarified. The stub will work more efficiently and on-chip integration will be possible on high frequency operation LSIs.