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Supply voltages: Docu-Task for Hagen :-)
by David Lanzendörfer 05 Mar '18

05 Mar '18

Hey Hagen Could you please elaborate on that "we can work on any supply voltage we want internally" from yesterday in the mumble conference a little bit further? Maybe some circuit diagram in LaTeX and some explenatory text I can include in the dimensioning section would be fantastic! Kind of like a small explenation how one could get 2 or 3 stacked transistors to operate with TTL and CMOS logic levels with out V_Tn~=0.8V and V_Tp~=-0.8V Cheers David

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Re: [Libre-silicon-devel] Drive-in (diffusion) time
by David Lanzendörfer 03 Mar '18

03 Mar '18

Hi Shuyun > The p-well and the n-well will need around 12 hours of diffusion each. > How does the diffusion machine work? > Is there a timer after which the furnace will reduce the heat and slowly > cools the wafer down and then goes into standby until I take the wafer out? > If yes: > Do you think it is possible that I just come there in the evening, put the > wafer in and come back the next morning, taking it out? I've reduced the time for the p-well to 3 hours by reducing the depth of the well. Now I only have got the n-well left, which needs to be diffused for 12 hours. So still the question: Can I put the wafer into the diffusion chamber over night? Cheers David

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Frequencies
by David Lanzendörfer 27 Feb '18

27 Feb '18

Hi Hagen! What are the frequencies you get right now simulating your gates with the parameters: n-device p-device C_ja 3*10^-4 pF/um^2 5*10^-4 pF/um^2 Cjp 4*10^-4 pF/um 4*10^-4 pF/um Just for curiosity Cheers David

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QtFlow and standard gate design
by David Lanzendörfer 25 Feb '18

25 Feb '18

Hi Until I've gotten the features back I've broken by splitting up QtFlow into more modular submodules for building them with CMake you can use Magic for designing the first gates: http://www.ece.iit.edu/~eoruklu/courses/ece429/tutorial/magic.html I've got a Qt5 based Magic editor which understands Magic so we will be able to pick up where we leave with Magic and go on with QtFlow, as soon as the tool is being repaired. Also today I've advertised QtFlow during the Twitch-Stream of Noopkat and some folks already have git clones the project and promised to "bombard me with pull requests" (will see whether they keep their promise) Anyway. Tomorrow I will start doing some simulations of the drive-in process step in Octave and will update the LaTeX files for the process spec accordingly. For all who didn't attend the mumble session (which was basically everyone except Hagen and me). The tasks for this week: * Getting a formula for the dopant concentration in the n-well for a given time and temperature * Rework the dopant specification (top to bottom) based on specs from Hagen resulting from his simulations of his logic gate designs with the worst stacking numbers (4 transistors in series!) * Working on QtFlow Cheers David

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Values: pirate pad
by David Lanzendörfer 25 Feb '18

25 Feb '18

Hi We're going to collect the target parameters for our architecture here in this pirate pad: http://piratepad.net/eFacTaaVT5 Then I check whether they are realistic from our physics point of view. Cheers David

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Mumble
by David Lanzendörfer 25 Feb '18

25 Feb '18

Hi Please don't forget the mumble conference we have in 10 Minutes: IP address: 109.109.202.102 Port: 64738 Cheers David

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Well depth, mathematics
by David Lanzendörfer 25 Feb '18

25 Feb '18

Hi I've now gone through the theory for forming n/p-wells and it seems we have to do a diffusion simulation of the partial differential equations called the "continuity equation"/ Or does someone have a more specific equation already around which is a specific solution to the case of Silicon+Boron and Silicon+Phosphorus? If yes, could you maybe hack a piece of LaTeX with it as content? Cheers David

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Diffusion
by David Lanzendörfer 24 Feb '18

24 Feb '18

I'll be putting this into the LaTeX file in the chapter "Diffusion" for calculating the drive-in temperature and time: http://slideplayer.com/slide/12275641/ I'll notify you when I'm done doing so, then you folks can verify my numbers. Cheers David

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