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i want to design a power amplifier in Tanner L-Edit.

I want to write code in the .ext file but I don't know what syntax or language the .ext file is expecting. Is it spice? I couldn't find a good tutorial.

The second option is to use the Dev-Gen tool but it produced this error:

Device = Mosfet
Channe = N
Single Transistor Length = 1.00
Single Transistor Width = 22.00
Transistor Multiple Count = 22
Bulk Pattern = 0
Gate Finger Pattern = 0
Source/Drain Finger Pattern = 0
Generated by: Dev-Gen ver. 14.11

enter image description here

If I check the SPICE paramter back annotation as in this screenshot:

enter image description here

All I get is the error (when I choose the .ext file Generic_025.ext)

Extract definition file is not selected.
Please click Browse EXT File button to select the file.

enter image description here

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We prefer error messages to be in text format. That way, they're easier to read, and can be indexed by Google and by our search tools. I transcribed the text in your first image, but that doesn't look like an error message to me. Did you intend to write something different? – Kevin Vermeer Dec 9 '11 at 14:21
ok , thanks, no that is the error i get. and i assume that where the problem is. – 0x90 Dec 9 '11 at 14:31

1 Answer

up vote 3 down vote accepted

You seem to be going about things in a bit of an odd way, L-Edit is used for laying out IC's, from Tanner EDA you should really be using s-edit to design the schematic before laying out, as mistakes at the IC level can be very costly.

I believe that the .ext file is the extract definition file, the format for this is in the manual, it has been some time since I have looked at this.

Normally your silicon foundry will provide you with a process development kit which will include the design rules and extract definition. If not you will need to create this or get someone else to do this. I know tanner EDA and the European distributers EDA solutions provide this service but that costs money.

The Dev-gen function is only useful for creating individual devices such as capacitors and mosfets, to go from there you will need to create metal interconnects.

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it has been a long time since i have used dev gen, I know there is a good section in the manual, which is available via the help menu – Mumbles Dec 8 '11 at 21:34

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