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Integrated regulation can reduce the effective supply impedance of digital circuits to meet the required supply noise margin with high efficiency. This can be achieved with a push-pull regulator topology in which the gain of regulation is controlled by digitally turning on sub push-pull blocks. The measured results from a 0.18 um CMOS test-chip verify that the proposed scheme reduces supply noise by 25 for 10 noise budget and 43 for 5 noise margin.
Date of Publication: January 2011