Patent ID: 7511528
Filing Date: 2009-03-31
Classification: H03K

Abstract:
1. A system for reducing noise in an integrated circuit (IC) comprising: a primary circuit including a first header communicating with a first power supply voltage for powering-up a voltage island circuit on the IC and functional circuitry on the IC; a secondary circuit including a secondary header communicating with a second power supply voltage for powering-up the voltage island; a programmed device for directing the primary and secondary circuits for powering the voltage island circuit and functional circuitry, the programmed device directing the secondary circuit to initially enable powering-up of the voltage island circuit to a pre-charged state, and subsequently disabling the secondary circuit while directing the primary circuit to enable powering of the functional circuitry during operation and the voltage island circuit, wherein a step response is avoided at the voltage island, wherein said primary circuit is sized to provide required load currents for functional operation of the IC at low voltage droop, wherein said programmed device controls said first and second headers for managing the state of the first and secondary headers of the at least one voltage island, and wherein said programmed device operates as a header control for prioritizing initial power requests for multiple voltage islands.