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Method for automatically determining the upper frequency range in frequency domain analysis

IP.com Disclosure Number: IPCOM000007122D
Publication Date: 2002-Feb-26
Document File: 3 page(s) / 28K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for automatically determining the upper frequency range in frequency domain analysis. Benefits include improved functionality for time domain simulation without reducing efficiency.

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Method for automatically determining the upper frequency range in frequency domain analysis

Disclosed is a method for automatically determining the upper frequency range in frequency domain analysis. Benefits include improved functionality for time domain simulation without reducing efficiency.

Background

              Frequency domain analysis has gained significant attention in high-speed signal integrity analysis. Conventionally, a high-speed signal integrity analysis is performed in time domain simulation measuring the timing and noise margins of the digital signals. By emerging into the high-frequency regime and 10- to 100-ps edge rate of the digital signals the system simulation suffers from high-frequency components and analog effects that could cause the failure mechanism in the system simulation. The root causes from the time domain simulation are often very difficult to find. Additional simulation may not detect the problems.

              A typical circuit for time or frequency simulation consists of the transient source, lumped or spice elements, characterized transmission lines in both measured or filed solver format, and termination. The time domain simulation measures the waveforms at arbitrary nodes in the circuit by defining the time domain simulation start, stop, and step and the source as defined by the type, fall and rise times, the frequency rate of the bit sequence, and the bit-sequence pattern.

              In frequency domain analysis, the stimuli are defined by start, stop, and step. The range of frequency of operation is not defined.

              Conventional frequency domain simulation does not detect the circuit’s high frequency. It is typically estimated by designers rather than calculated from the circuit components. This lack of precision can increase simulation time or result in inadequate results. 

Description

              The disclosed method automatically determines a circuit...