Method for delta-noise reduction

US6774836B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Roland Frech · Esslingen am Neckar, DE
• Bernd Garben · Schenefeld, DE
• Hubert Harrer · Böblingen, DE
• Andreas Huber · Holzgerlingen, DE
• Dierk Kaller · Schenefeld, DE
• Erich Klink · Schenefeld, DE
• Thomas-Michael Winkel · Eppelheim, DE
• Wiren D. Becker · Hyde Park, US

Key dates

• Filing date: Jun 16, 2003
• Grant date: Aug 10, 2004
• Expiry date: Jun 16, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G05F1/46
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A method, digital circuit system and program product for reducing delta-I noise in a plurality of activity units connected to a common DC-supply voltage. In order to smooth the fluctuations (delta-I) of a total current demand I, and a respective resulting fluctuation of the supply voltage, a signalling scheme between said activity units and a supervisor unit which holds a system-specific “database” containing at least the current demand of each activity unit device when operating regularly. Dependent of the quantity of calculated, imminent delta-I a subset of said activity units with a respective current I demand is selected and controlled, for either temporarily delaying their beginning of activity in case of an imminent supply voltage drop, or temporarily continuing their activity with a predetermined, activity-specific NO-OP phase in case of an imminent supply voltage rise.