Hi Guys I m trying to make a power nmos I have used the mult

Question

Hi Guys I m trying to make a power nmos I have used the multiplicity parameter in my spice file but in my layout I have made it using several nmos in parallel is there anyway I can get the LVS check not to fail because in the netgen LVS it has defined each transistor as a different net

Matthew Guthaus · Answer

Are you using the open pdks setup tcl Providing a test case might help us debug There is a parallel property in netgen

Stefan Schippers · Answer

< U02J59Q3FM0> Are the transistors truly in parallel that means all transistor terminals are connected together gate to gate source to source and so on How can netgen assign a different net to each

Eric Smith · Answer

I think you mean like in section 3 2 1 of the ngspice manual right <http ngspice sourceforge net docs ngspice html manual manual xhtml tab multiplier>

Eric Smith · Answer

That s not going to pass LVS because ngspice will autogenerate names for the parallel devices that don t exist in the netlist so the netlist compare can never pass

Nikhil M · Answer

< U025WQVVA75> yes that s right Doesn t pass on netgen Sorry for the late response i was out sick for 2 weeks

Nikhil M · Answer

< U01819B63HP> yes they are completely in parallel I used the setup tcl mentioned by < U0175T39732> didn t work Not sure if we need an enhancement on Netgen to deal with this when M factors are present

Matthew Guthaus · Answer

< U02J59Q3FM0> You need to provide a test case

Nikhil M · Answer

< U0175T39732> sure ill set up an LVS and get back