Signal Integrity Simulation Using ADS
应用文章
Question
What is the benefit of S-parameter simulation? What components are specific for S-parameter simulation?
Answer
S-Parameters Simulator calculates wide band S-parameters of a channel. Term is used to define the impedance and location of the ports for S-parameters simulation. Term has to be continuously numbered from one. Note that time domain sources, IBIS, IBIS AMI and SPICE IO models are not compatible with S-parameters simulation.
S-Parameter Simulator supports not only S-Parameters, but also Z Parameters and Group Delay. You can check the items which you want to examine during simulation. Z parameter is used to analyze the impedance profile of the power distribution network (PDN). It is useful for power integrity analysis.
Channel bandwidth and Crosstalk can be extracted from S-parameter. Channel bandwidth limits maximum bit rate. Insertion loss to crosstalk ratio affects system BER. Both channel bandwidth and crosstalk are important design factors for SI. A simple S-parameter simulation of channels is shown in Figure 2. The results of Insertion loss and crosstalk are shown in Figure 3.