Received: by 10.66.74.102 with SMTP id s6mr5123248pav.21.1349844872596; Tue, 09 Oct 2012 21:54:32 -0700 (PDT) Path: t10ni23661256pbh.0!nntp.google.com!news.glorb.com!news.astraweb.com!border6.newsrouter.astraweb.com!not-for-mail From: josephkk Newsgroups: sci.electronics.design Subject: Re: Sub circuit in Ltspice. Date: Tue, 09 Oct 2012 21:54:31 -0700 Message-ID: References: <5R4cs.1631$nQ6.1153@newsfe15.iad> <2v8378lbv36vi85n0pl0ep7m8vqiksvhma@4ax.com> <5071BB58.75E17D4D@electrooptical.net> <47k378losfg5f0qvj69ce75u3bgekt2dhg@4ax.com> <5071E16A.9BA9C04D@electrooptical.net> X-Newsreader: Forte Agent 6.00/32.1186 MIME-Version: 1.0 Lines: 140 Organization: Unlimited download news at news.astraweb.com NNTP-Posting-Host: 95f0f8aa.news.astraweb.com X-Trace: DXC=O4:4Dj8DMc05WGRN4JSiW2L?0kYOcDh@:E\F4^F8S=41I3M1Q7=KWa4;n^U31oXNS:o]:[;Gbfke3MQ=a2cL^EV5K6m4Y:5Vk;?E10CIT5n`X1 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable On Sun, 07 Oct 2012 16:09:14 -0400, Phil Hobbs wrote: >TheQuickBrownFox wrote: >>=20 >> On Sun, 07 Oct 2012 13:26:48 -0400, Phil Hobbs >> wrote: >>=20 >> >Jim Thompson wrote: >> >> >> >> On Sun, 07 Oct 2012 09:16:33 -0700, Joerg >> >> wrote: >> >> >> >> >Jim Thompson wrote: >> >> >> On Sun, 07 Oct 2012 07:29:30 -0700, Joerg = >> >> >> wrote: >> >> >> >> >> >>> Jamie wrote: >> >> >>>> If I create a sub circuit in LTspice, will that circuit's = content be >> >> >>>> exported with the main file or do I need to include that along= with the >> >> >>>> file? >> >> >>>> I read the help file but it some what does not give me a = fuzzy feeling.. >> >> >>>> >> >> >>> If you place the whole subcircuit text into your schematic as a= SPICE >> >> >>> directive then it is included. That's how I always do it. = Typically to >> >> >>> the left or below so clients have a choice of printing it out = along with >> >> >>> the schematic or not. >> >> >>> >> >> >>> Much better than needing two files or having to load library = parts. >> >> >> >> >> >> What Joerg suggests is the equivalent of .INCLUDE in other = Spice's. >> >> >> Slows down the loading of the input file. .LIB is faster and = more >> >> >> efficient. >> >> >> >> >> > >> >> >What I meant is .SUBCKT in the input file. >> >> >> >> OK. I misread your intent. That's equivalent to a .LIB call... = only >> >> what you need is loaded. >> >> >> >> >I've never had any speed >> >> >issues, they load in a second or two. What does take forever is = sims >> >> >with gapped transformers in there, leakage inductance and all = that. And >> >> >then the office temp start to rise and rise and rise. >> >> >> >> Heats my office in winter ;-) >> >> >> >> > >> >> >I've got an Intel 1.6GHz dual core in there. >> >> >> >> That's what I have in my notebook (Thinkpad X61s): 1.60 GHz Intel >> >> Core2 Duo. It runs slower than my old Win2K machine (Analog3) with= a >> >> 2.20GHz AMD Athlon 64 and only 1G of RAM :-) >> >> >> >> >Rumors have it that the >> >> >Intel i7 could be almost twice as fast. Have you heard and = confirmations >> >> >in that direction? >> >> >> >> Since Analog1 (also 2.20GHz AMD Athlon 64, but WinXP Pro) crashed = and >> >> burned, I'm pondering what to replace it with. Mark/qrk is the >> >> resident expert on benchmarking. There's so much Intel malarkey = out >> >> there, it's difficult to know what would be best for a simulation >> >> machine. >> >> >> > >> >My main office machine is a nice Supermicro dual 8-core AMD Magny = Cours >> >with 32G of RAM and a nice RAID5 disc array. I bought it about a = year >> >ago for a bit under $4k. It runs CentOS 6.2 Linux, with kvm/qemu >> >virtual machines for XP/32 and Win7/64. >> > >> >LTspice flies. >> > >> >Cheers >> > >> >Phil Hobbs >>=20 >> It isn't "nice" if it doesn't have USB 3. also needs SATA 3, cause = RAID >> 5 on the old interface spec is no gain. >>=20 >> $4k??? Supermicro saw you coming. Or the guy you got to build it = for >> you. >>=20 >> I'd go with an EVGA dual XEOM MOBO and fill it with 6 or 12 way = (core >> pairs). Put all my money into the CPUs and MOBO. AMD mobos are all >> taking a hit these days, mainly because the idiots embraced and bought >> ATI. >>=20 >> Supermicro makes dual CPU mobos. Oh boy. They have always been = hugely >> overpriced and underfunctioned. >>=20 >> EVGA makes MODERN dual CPU motherboards. Supermicro is like Dell. = It >> is two year old technology the moment you buy it. With this, even = more >> than 2 years. >>=20 >> And the price difference is small enough that I stopped buying AMD 8 >> years ago. Intel Mobos and CPUs scream. > > > >How much heavy duty floating point do you do in a day? Have you done >any actual benchmarks for floating point performance between Intel and >AMD? > > >Cheers > >Phil Hobbs =46or pretty much anyone here, that reduces to how much SPICE simulations= do you run. If it is a lot, AMD based machines may still have an advantage. Otherwise not much difference, most anything since a 1.4 GHz P4 is overkill unless wasted away by the OS and Desktop. ?-)