What I'm mostly curious about is why that wasn't caught by the timing analysis ?

Hello all, I am facing some difficulties in creating a multi finger transistor in magic with parallel connection by overlapping the diffusion area. I could realize a parallel connections of two transistors by placing them individually and by connecting the source with source, drain with drain and gate with gate. By default left side diffusion area is assigned as source and right side as drain, When i try to overlap the drain diffusion area and merge two of the drain terminals together by flipping one of the transistors, I couldn't succeed in generating the overlap (SD-DS) . When i generate the spice netlist , I could see the transistors are only in series connection(SD-SD). Is there any way to realize parallel connections of transistors by overlapping the diffusion area?

@mehdi @Tim Edwards I have two questions with recent developments: 1) Will there be a meeting on coming Thursday (March 6) with some clarifications? Tim was supposed to present but I think that might not happen with recent developments. 2) Should we move this channel also over to Fossi Chat server, if this slack is going to close. We can continue discussions there.

#164 MOSFET PSP model usage of NF parameter Issue created by hpretl When I do a simple testbench in ngspice simulating just a single LV-NMOS (I assume it is the same for PMOS and HV variants, but I have not checked it), I see that the model parameter

rg

is not reacting to the number of fingers I set. This is not ideal, as the PSP model can model extrinsic resistances. From the PSP model doc: image The calculation of

rg

is: image In the model file of IHP's PDK, the PSP model is instantiated like that: image This means that essentially the

nf

(number of fingers, here called

ng

, which is not consistent) parameter is never passed on to the PSP model, instead only the width of a single finger is used in the model, and the multiplier parameter

m

is then increased by

nf

as passed on to the model as

mult=ng*m

. In this way, the intrinsic model does not know about the true

nf

and

m

parameters. This is also confirmed by looking at the model parameters in ngspice, which always shows

nf=1

. Maybe this can be changed in a future release? It looks like some capabilities of the PSP model are bypassed in this way. IHP-GmbH/IHP-Open-PDK

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Does anyone know how you'd implement a bucket brigade on Sky130 ? The trick is to manage to create a lot of capacitance between the drain and gate of a mosfet. Looking at they seem to have a second poly deposition after the n+ implants of the drain and use that as the capacitance. But AFAIK that's not an option in sky130.

I am a beginner using XSCHEM. I designed a NAND gate using NFET and PFET and created a symbol from it. However, when I use the symbol in a test bench, it results in an error. Is this a known issue? Thanks.

There was a linkedin post ~ 1 month ago mentionning NV (OTP?) devices on iHP SG13G2 but I don't see anything about that in the PDK ? Is there doc somewhere about this ?

@Tim Edwards are the install instructions for Xcircuit up-to-date on the opencircuitdesign website? I tried installing it but after running

./configure

(without any options, I am guessing it takes the default values then) and then running

make

, I am getting this missing file/directory error

Please assist me in determining whether this circuit operates as a monostable and how to obtain square wave output if it does.