Triangular Active Charge Injection Method for Resonant Power Supply Noise Reduction

Masahiro KANO  Toru NAKURA  Tetsuya IIZUKA  Kunihiro ASADA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.4   pp.292-298
Publication Date: 2018/04/01
Online ISSN: 1745-1353
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
signal integrity,  resonant power supply noise,  triangular active charge injection,  DLL,  vernier TDC,  

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Summary: 
This paper proposes a triangular active charge injection method to reduce resonant power supply noise by injecting the adequate amount of charge into the supply line of the LSI in response to the current consumption of the core circuit. The proposed circuit is composed of three key components, a voltage drop detector, an injection controller circuit and a canceling capacitor circuit. In addition to the theoretical analysis of the proposed method, the measurement results indicate that our proposed method with active capacitor can realize about 14% noise reduction compared with the original noise amplitude. The proposed circuit consumes 25.2 mW in steady state and occupies 0.182 mm2.