Browse Prior Art Database

Power Grid Resonance Characterization and Suppression

IP.com Disclosure Number: IPCOM000033795D
Publication Date: 2004-Dec-28
Document File: 3 page(s) / 719K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a new resonance system that mimics a real processor power grid’s impedance, resonance frequency, and scalable current loads. It can characterize the power grid resonance, and efficiently test a circuit to suppress it.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

Power Grid Resonance Characterization and Suppression

Disclosed is a method for a new resonance system that mimics a real processor power grid’s impedance, resonance frequency, and scalable current loads. It can characterize the power grid resonance, and efficiently test a circuit to suppress it.

Background

The RLC of the power grid, package, decoupling capacitors, and switched/non-switched circuits form a multiple resonant system (see Figure 1). Among these resonances, the dominant one is the package inductance L with the on-die decoupling capacitance C. This resonant frequency can introduce substantial voltage fluctuations in the on-die power grids, resulting in a degraded circuit performance, or in the worst cases, causing a circuit failure or damaging the gate oxides.

General Description

The disclosed method proposes a new resonance system to mimic a real processor power grid’s impedance, resonance frequency, and scalable current loads. With this system, the power grid resonance can be characterized, and a circuit can be tested to suppress it. This system includes an excitation block, synthesized current loads, resonance suppression blocks, and a droop detection circuit. A simplified system diagram is shown in Figure 2.

The disclosed method assumes a normal synthesized load current S mA, which is a scaled down power grid current from a real processor system, based on the number of power grids. It assumes x% of Vcc voltage fluctuation out of resonance frequency range. The corresponding resistance value is obtained at this range. If there is y% of Vcc voltage fluctuation at the resonance, then .

Since power grid impedance                                                                                            

                   

combining this with t...