X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
Mime-Version:	1.0 (Apple Message framework v1085)
Subject:	Re: [geda-user] Translating SI notation to SPICE
From:	John Doty <jpd AT noqsi DOT com>
In-Reply-To:	<CAM2RGhT1dSepoZA=VN0oetb20PTitw1=UhvLyXtS=xmJz_kO3g@mail.gmail.com>
Date:	Wed, 21 Nov 2012 19:43:07 -0700
Message-Id:	<37FD988D-FEBC-42EB-99CA-851EFD167D02@noqsi.com>
References:	<20121116030224 DOT 5c7750ee AT akka> <201211160225 DOT qAG2PrVD005630 AT envy DOT delorie DOT com> <20121116035513 DOT 14519 DOT qmail AT stuge DOT se> <201211160357 DOT qAG3vUXo017504 AT envy DOT delorie DOT com> <20121116041216 DOT 16057 DOT qmail AT stuge DOT se> <201211160428 DOT qAG4Sh3h018631 AT envy DOT delorie DOT com> <llhhn9x25t DOT ln2 AT skate DOT rswarbrick> <k88cd4$3i2$1 AT ger DOT gmane DOT org> <20121117163351 DOT 14988 DOT qmail AT stuge DOT se> <5C6FC5CD-A358-476D-A8CA-C9AF2E72A914 AT noqsi DOT com> <20121117185520 DOT 25698 DOT qmail AT stuge DOT se> <E2A7C157-E0AB-437B-B8FD-1DA96C64AF39 AT noqsi DOT com> <k89b87$fip$1 AT ger DOT gmane DOT org> <B8C80ED4-E795-41D2-9D76-513A7D09666C AT noqsi DOT com> <k8bv02$1ca$1 AT ger DOT gmane DOT org> <9C626D0F-7D63-4FBE-8D63-37A2FFAD96FE AT noqsi DOT com> <CAM2RGhQXd_-f3AD2W0iNTvbUU0o8O727f0sR=vkEjC-zg0PmVw AT mail DOT gmail DOT com> <71EA2CF8-8F64-4A51-B7C4-5F26EE8F4088 AT noqsi DOT com> <CAM2RGhR3tC52C8Jj9171a5xogwPy9PA_6DrOBF=F3742cbvAhg AT mail DOT gmail DOT com> <CAM2RGhRPE5YpB4p6hBbZwUE-DF4vdMCn-UoZONe9bNPHX+FN-Q AT mail DOT gmail DOT com> <D904E454-596B-4B02-82B6-0CA2EC854690 AT noqsi DOT com> <25B41A6E-E2ED-4EEB-ADAE-558B8B!
	CFB993 AT noqsi DOT com> <20121119145732 DOT 2B114813BDB3 AT turkos DOT aspodata DOT se> <E5ECF326-39B6-4325-B3C0-66EAD03186AE AT noqsi DOT com> <20121119182107 DOT 98F08813BDB7 AT turkos DOT aspodata DOT se> <4F02B9C0-5C7A-4C7B-A23C-C99285C4CFFB AT noqsi DOT com> <CAM2RGhT1dSepoZA=VN0oetb20PTitw1=UhvLyXtS=xmJz_kO3g AT mail DOT gmail DOT com>
To:	geda-user AT delorie DOT com
X-Mailer:	Apple Mail (2.1085)
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id qAM2hD0H026771
Reply-To:	geda-user AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
X-Mailing-List:	geda-user AT delorie DOT com
X-Unsubscribes-To:	listserv AT delorie DOT com

On Nov 21, 2012, at 2:20 PM, Evan Foss wrote:

> Is it naivety to suggest that we just apply the scale from engineering
> notation only for component values to end in their unit type? All
> other cases remain the same since there are as far as I know no units
> that have 2 letter abbreviations.

There are many ambiguous cases. One question in my mind is how to decide which attributes to translate. Your concern suggests I should have different syntax in the spice-prototype attribute for SI dimensioned numerical quantities versus other attributes.

> 
> The question in my mind is just what to do with the meter units you
> want to use. By all means we should have them but what is spice going
> to do with them?

It is very common to specify the characteristics of elementary SPICE devices in terms of their geometry. In some cases, the dynamic range is extreme. MOSFET gate widths range from nanometers (components of fast, low fanout internal gates) to meters (folded up in power devices).

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com

- Raw text -