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Feedforward Active Substrate Noise Cancelling Based on di/dt of Power Supply Toru NAKURA Makoto IKEDA Kunihiro ASADA Publication IEICE TRANSACTIONS on Electronics Vol.E89-C No.3 pp.364-369 Publication Date: 2006/03/01 Online ISSN: 1745-1353 DOI: 10.1093/ietele/e89-c.3.364 Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Section on VLSI Design Technology in the Sub-100 nm Era) Category: Signal Integrity and Variability Keyword: substrate noise, di/dt, feedforward active cancelling, anti-phase, ground bounce, di/dt detector, Full Text: PDF(673.2KB)>>
Summary: This paper demonstrates a feedforward active substrate noise cancelling technique using a power supply di/dt detector. Since the substrate is usually tied with the ground line with a low impedance, the substrate noise is closely related to the ground bounce which is proportional to the di/dt when inductance is dominant on the ground line impedance. Our active cancelling detects the di/dt of the power supply, and injects an anti-phase current into the substrate so that the di/dt-proportional substrate noise is cancelled out. Our first trial shows that 34% substrate noise reduction is achieved on our test circuit, and the theoretical analysis shows that the optimized canceller design will enhance the substrate noise suppression ratio up to 56%. | |||||
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