Author Topic: DaveCAD: Representation for a MOSFET?  (Read 3482 times)

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Offline NivagSwerdnaTopic starter

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DaveCAD: Representation for a MOSFET?
« on: October 18, 2019, 09:09:34 am »
When using DaveCAD how do you draw MOSFETs? 

(Context: Drawing all the bits of a MOSFET is a PIA)
 

Offline T3sl4co1l

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Re: DaveCAD: Representation for a MOSFET?
« Reply #1 on: October 18, 2019, 09:49:41 am »
TimCAD will sometimes draw an "insulated gate JFET" style symbol.  Generally prefers the full version, since S/D matters.

Can't speak for DaveCAD, obviously...

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Offline Ysjoelfir

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Re: DaveCAD: Representation for a MOSFET?
« Reply #2 on: October 18, 2019, 01:01:42 pm »
KaiCAD usually draws the normal MOSFET symbol but with a straight line for the substrate/drain/source part and leaves out the double connection for the source and the body diode, instead just draws one connection and an arrow. basically like

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Greetings, Kai \ Ysjoelfir
 
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Online Zero999

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Re: DaveCAD: Representation for a MOSFET?
« Reply #3 on: October 18, 2019, 01:05:15 pm »
ZCad normally draws the full MOSFET symbol, but only bothers with the body diode, if it's relevant to the circuit.
 
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Offline TheUnnamedNewbie

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Re: DaveCAD: Representation for a MOSFET?
« Reply #4 on: October 18, 2019, 02:40:04 pm »
I tend to go with the standard symbol used by analog IC communities - like a BJT (so arrow towards the 'gate' line for PMOS, away for NMOS), but the source and drain lines are perpendicular to the 'gate' line, instead of at an angle. So kinda like a JFET, but with the arrows like on a BJT.

This is simply the way the community I work in has agreed to do it. I used to try the more 'correct' symbol as dictated by standards but the only thing it achieved was to confuse people looking at my work.

Image of the symbols I use:
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Offline bjbb

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Re: DaveCAD: Representation for a MOSFET?
« Reply #5 on: October 18, 2019, 04:02:49 pm »
in order of precedence

1. IEC 60617
2. ANSI Y32
3. your national standard harmonized with the IEC standard
4. your employer's standard library.
 
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Offline mc172

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Re: DaveCAD: Representation for a MOSFET?
« Reply #6 on: October 18, 2019, 04:09:52 pm »
I draw a bipolar transistor and write an M next to it because I can't ever be arsed to draw or the bits nor remember where the bits all go.
 
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Offline NivagSwerdnaTopic starter

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Re: DaveCAD: Representation for a MOSFET?
« Reply #7 on: October 18, 2019, 04:20:58 pm »
... because I can't ever be arsed to draw or the bits nor remember where the bits all go.
That in a nutshell was what motivated the question.  :-DD
 

Offline Kasper

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Re: DaveCAD: Representation for a MOSFET?
« Reply #8 on: October 18, 2019, 05:08:56 pm »
I draw a bipolar transistor and write an M next to it because I can't ever be arsed to draw or the bits nor remember where the bits all go.

Haha nice.  I just put some right angles and write 'pmos' or 'nmos' and the body diode. Must have the body diode.
 

Offline SparkyFX

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Re: DaveCAD: Representation for a MOSFET?
« Reply #9 on: October 18, 2019, 07:48:36 pm »
I look it up. E.v.e.r.y.t.i.m.e.
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Offline TheHolyHorse

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Re: DaveCAD: Representation for a MOSFET?
« Reply #10 on: October 18, 2019, 08:12:19 pm »
I look it up. E.v.e.r.y.t.i.m.e.

There's always something that you just can't remember if your life was depending on it. :-DD
 


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