I'm pretty new to Momentum (and ADS in general) but I've been working on circuit incorporating some non-linear models that required DC sources. I first built up the circuits in the schematic simulator and they are working well enough, but before ordering parts and material I wanted to give it a go in momentum to make sure nothing funny happens due to the actual layout. The momentum layout is built including referencing place holders for the non-linear models, but how can I define a fixed bias condition for those devices (resulting in a fixed s-parameter set) for those models during the momentum analysis?
I've thought about generating s-parameter data external to the layout at a fixed bias condition and importing the resulting s2p file into momentum, but the devices aren't connected to any easily defined impedance...definitely not 50ohms so I'd be wary of the s-parameter data I get just using 50ohms or some other 'guessed' port impedence.
Would be a lot easier if I could establish fixed bias through ports or some other method in Momentum or run the schematic simulator using the layout for the applicable traces and pads so I could use the non-linear models direclty...
Any help is much appreciated. Thanks!
I've thought about generating s-parameter data external to the layout at a fixed bias condition and importing the resulting s2p file into momentum, but the devices aren't connected to any easily defined impedance...definitely not 50ohms so I'd be wary of the s-parameter data I get just using 50ohms or some other 'guessed' port impedence.
Would be a lot easier if I could establish fixed bias through ports or some other method in Momentum or run the schematic simulator using the layout for the applicable traces and pads so I could use the non-linear models direclty...
Any help is much appreciated. Thanks!
May 8, 2007 5:20 PM