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Method and System for Real-time Detection of Potential Resonant Frequencies.

IP.com Disclosure Number: IPCOM000190074D
Original Publication Date: 2009-Nov-16
Included in the Prior Art Database: 2009-Nov-16
Document File: 3 page(s) / 129K

Publishing Venue

IBM

Abstract

A method and system for detecting potential resonant frequencies without requiring predetermined knowledge of resonant frequencies is disclosed. The method and system monitors potential resonant frequencies in real time. During monitoring of the potential resonant frequencies, the method and system outputs different states when supply voltage is outside or within user defined acceptable bounds.

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Method and System for Real-time Detection of Potential Resonant Frequencies .

Disclosed is a method and system for detecting potential resonant frequencies using an Automatic Resonance Detection Circuit (ARDC).

In order to ensure proper system functionality and reliability across all operating frequencies (including the ones generated by various data patterns), potential resonant frequencies must be known. Knowledge of such potential resonant frequencies may be utilized by specialized circuitries to reduce resonance in a chip or on a system board. Typically, a band pass filter is used to detect frequencies that can potentially excite resonance. In order to design such a filter, foreknowledge of frequencies of interest, and system data activity and patterns that may generate such frequencies, is required. However, resonant frequencies are a function of system parameters that often are not known before hand, such as printed circuit board inductance. Further, information about frequencies of interest and knowledge about system data activity and patterns is often only available after the fact, for example during the investigation of a system failure.

The method and system disclosed allows real-time monitoring of potential resonance situations. An ARDC as disclosed herein, identifies when a system is entering resonance without requiring predetermined knowledge of resonant frequencies. Fig. 1 illustrates a two state ARDC that can be applied to any system power supply to monitor potential resonance situations.

Figure 1

In order to determine potential resonance situations, a designer sets voltage bounds on a power supply that needs to be monitored for resonance. For example, the designer may specify 0.9V-1.1V on a 1V Vdd-Gnd supply as acceptable voltage bounds on the power supply. The ARDC will output a state "1" when the supply voltage is outside the specified acceptable bounds and will output a state "0" when the supply voltage is within the specified acceptable bounds.

In a scenario, additional states may also be incorporated in the ARDC circuit shown in Fig. 1. These additional states may allow addition and removal of gradual amounts of circuit elements, such as capacitive elements to suppress resonance or noise in the circuit.

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Fig. 2 illustrate...