## Implementing Models in Eagleware Genesys
## S-parametersS-parameters are convenient to use, but the frequency resolution may not be adequate for narrowband simulations. Yield analysis is not possible with S-parameters. If the frequency resolution is inadequate or if you wish to perform a yield analysis, use our lumped element (SPICE) models (see below). Our S-parameters are provided in a single compressed "zipped" file. The file must be "unzipped" after downloading to obtain the separate inductor value S-parameter files. 1. Click on the "Linear" element menu.
## Lumped element (SPICE) modelsTo model our rf chip inductors, each individual lumped element (R2, RVAR1, L, C and R1) for the complete model must be placed into the schematic. An example chip inductor schematic is shown in Figure 1. ## Figure 1. Example schematic for a Coilcraft chip inductor
## Figure 2. Example schematic for a Coilcraft power inductor
## For a frequency-dependent resistance (RVAR1, RVAR2)Note: This example uses RVAR1 ( = k1 * sqrt (Frequency in MHz)). ## For a frequency-dependent inductance (LVAR)Note: This element is used in some of our power inductor models. ## Graphing specific model inductance and Q results
## Inductance (for versions 2004 and earlier)To view the effective series inductance of the model in a graph: ## Inductance (for versions 2004 and earlier)Measuring inductance in Genesys 2005 is different than in previous releases. Start by creating two new variables in the “Equations” window: inputZ = im(zin(Linear1_Sch1_Data.S[1,1],Linear1_Sch1_Data.ZPORT[1])) Once these variables are created, they can be accessed in rectangular graphs or as outputs in the “data” section of the simulation. To see a tabular output, open the Data section of the simulation and right click in the variable section and select “add new variable”. Enter the variable “L_model” into the formula prompt as “L” or “Inductance”. The inductance is output in the data section. To create a rectangular graph, select “Equations” in the Dataset section. Enter "L_model" into the measurement section of the graph properties.
## Quality factor (Q)Q values and curves in our data sheets are typically based on measurements using an impedance analyzer in a 50 Ohm environment, giving a 1-port (reflection) measurement result. If Q calculations are to be compared with data sheet values and curves, they should be based on a simulation with one port of the inductor model connected to ground (as shown in Figure 2). |

Contact Info1102 Silver Lake Road, Cary, Illinois 60013 Local: (847) 639-6400 Toll Free: (800) 322-2645 Email: cp@coilcraft.com(Click map on right for directions) Copyright © 2017 Coilcraft CPS |