Design and cad of noise sensors for on-die supply voltage emergency detection

Power supply fluctuation can be potential threat to the correct operations of microprocessors, in the form of voltage emergency that happens when supply voltage drops below a certain threshold. Noise sensors can be added to the chips to detect the voltage emergencies. But these deliberately inserted sensors brings extra design and calibration cost, and therefore, they are only added to a limited number of locations on the chip, typically along the critical paths. Extra CAD solutions are further required to fully exploit the potential of these added sensors in detecting the emergencies occurred over the whole chip area.