Adaptive gain push-pull shunt regulation in digital circuits

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.