A nonvolatile power management apparatus that controls the use of power within an integrated circuit. The embodiment varies the power applied to a functional circuit within the integrated circuit. At nominal power, the functional circuit operates normally per nominal operational specifications. Under...http://www.google.com.tw/patents/US6195755?utm_source=gb-gplus-share專利 US6195755 - Nonvolatile power management apparatus for integrated circuit application