On-Chip Switched Decoupling Capacitor for Fast Voltage Hopping of DVS Systems

Jinmyoung KIM  Toru NAKURA  Koichiro ISHIBASHI  Makoto IKEDA  Kunihiro ASADA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.4   pp.560-567
Publication Date: 2013/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.560
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Solid-State Circuit Design—Architecture, Circuit, Device and Design Methodology)
Category: 
Keyword: 
DVS,  fast voltage hopping,  resonant supply noise,  decoupling capacitor,  noise reduction,  capacitance boosting,  

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Summary: 
This paper presents a decoupling capacitance boosting method for the resonant supply noise reduction by fast voltage hopping of DVS systems. The proposed method utilizes a foot transistor as a switch between a conventional decoupling capacitor (decap) and GND. The switching controls of the foot transistor depending on the supply noise states achieve an effective noise reduction as well as fast settling time compared with the conventional passive decaps. The measurement results of a test chip fabricated in a 0.18 µm CMOS technology show 12X boost of effective decap value, and 65.8% supply noise reduction with 96% settling time improvement.