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Re: Including model with process corners for mosfets
Tony Casey
<snip>
--- In LTspice@..., "RobertTalty" <rtalty@...> wrote: </snip> Hello Robert, I think you mean ctrl-right-click. For the NMOS symbol, you don't get the component attribute editor unless you do this, you get the "choose new MOSFET" dialogue. For the NMOS4 device, right-clicking brings up the monolithic device editor instead. Regards, Tony |
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Re: Simple model for diffin-diffout amp
Hi AG,
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I would caution against using a simple E source based fully differential amp model. Usually G source with appropriate resistor results in a much better behaved model. I believe I suggested you download some ADC models. within that ADC collection are some fully differential CMOS opamp / OTA models. For a very simple model I would use .subckt ideal_differential_op_amp Vinm Vinp Outp VCM Outm R1 Outp N001 1 R2 N001 Outm 1 G1 N001 Outp Vinp Vinm 100MEG G2 Outm N001 Vinp Vinm 100MEG G3 0 N001 VCM N001 100MEG .ends ideal_differential_op_amp you can also include output caps to limit the bandwidth and change the resistor values to model the output impedance. I cant give you the exact models I use at work because they don't really belong to me. regards Robert --- In LTspice@..., "Apparajan" <dg1@...> wrote:
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Caps smaller than 0.5 uF?
When I look in the list the smallest shown is 0.5uF. When putting together a schematic with smaller caps, eg. 470pF I don't know any of the info on them other than the value. I see that the ones in the list have all the needed data. Is there a database or other info on smaller caps?
Thanks, Ken |
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Re: Including model with process corners for mosfets
Hi Tal,
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If you right click on the device, you should get the "component attribute editor" window the Prefix will be MN, change this to XN. The Value NMOS needs to be changed to match the subcircuit name. That's about all you will need to do. regards Robert --- In LTspice@..., "TALTITO" <sloimi@...> wrote:
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Re: Simple model for diffin-diffout amp
Apparajan
I am re-posting this since I din't get a boo or an aye or nay..
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Cheers AG --- In LTspice@..., "Apparajan" <dg1@...> wrote:
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Re: AC response
Ganesan
I am re posting this since I didn't get aye or nay...
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Cheers AG On 9/10/2011 6:46 PM, Ganesan wrote:
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Re: CD4060 and CA3130 spice models request
Hi KMR,
I think the nearest you are going to get to a CD4060 LTspice model is by using a CD4020 which is similar to the CD4060 but the CD4020 has not got an attendant oscillator. You can remedy this descrepancy in features between the two devices by adding an RC/Xtal oscillator using an external to the chip nand gates RC/Xtal oscillator to drive the CLK input of the CD4020 and 'Hey presto ! ' you have got a very similar to the CD4060 working set up. The CD4020 has an LTspice model and symbol in our LTspice library. Let me know how you get on. Good luck and regards, Michael To: LTspice@... From: kmr4uall@... Date: Tue, 13 Sep 2011 19:07:26 +0000 Subject: [LTspice] CD4060 and CA3130 spice models request hi i am a new member please help me i wants pspice models for these ic's IC = CD4060 (CMOS 14-STAGE RIPPLE-CARRY BINARY COUNTER/DIVIDER AND OSCLLLATOR ) and CA3130 (15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output ) please help me [Non-text portions of this message have been removed] |
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Re: CD4060 and CA3130 spice models request
Ganesan
Maybe substituting with A models and Helmut's expertise will get him
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over the hump.. It did for me.. Thanks everybody.. Cheers AG On 9/13/2011 4:22 PM, Rick wrote:
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Re: CD4060 and CA3130 spice models request
Ganesan
* 31 Oct 2006, 1:39 AM doom49 Joined on 10-14-2006 Posts 4 A model for CD4060 CMOS 14 Stage Ripple-Carry Binary Counter/Divide I am not successful to find a model for this I.C., do someone of you knows where I can find it? Thanks, Roby. 07 Nov 2006, 2:30 AM peleus Joined on 10-31-2006 Posts 2 Re: A model for CD4060 CMOS 14 Stage Ripple-Carry Binary Counter/Divide Hi Roby. In case you haven't found the model you need it is not very difficult to make the one. All you need is a schematic of the CD4060 logic which is easy to search for and then create the model utilizing LOGICEXP, PINDLY and CONSTRAINT digital behavioral primitives available in pspice for modeling digital devices. If you take a look at some digital library in pspice you'll see that some models are built using the latter primitives. Good look. D. *** On 9/13/2011 3:56 PM, Tony Casey wrote:
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Re: CD4060 and CA3130 spice models request
Tony Casey
--- In LTspice@..., "KMR" <kmr4uall@...> wrote:
Perhaps you should try a Pspice forum? This is a group for LTspice. I feel sure that if you looked in the Files section of the group site, you would probably find information that might help you. Almost certainly, any Pspice model you find for a CD4060 will not work in LTspice, unless it is transistor level model. Regards, Tony Regards, Tony |
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Re: Starting LTspice GUI from script file loading .sch and .cir - Linux
Tony Casey
--- In LTspice@..., "Axel K" <axelmklein@...> wrote:
Hello Axel, Running four instances of LTspice from a bash shell is not a problem, but I don't think it's possible to open two files at once, either in Windows or Linux, from the command line. I've tried in both and failed. It probably depends on the computer (number of cores etc), but when running from a bash shell, I've had up to 20 instances of LTspice running netlists in batch mode before problems set in. This is from a Python script, in which I check how many processes are currently active. What you want is not possible, as far as I can tell. SCAD3.exe only seems to accept only one target file as a command line argument, even in batch mode. Makes sense, really. Regards, Tony |
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Sensitivity Anlysis..
Apparajan
Let s take a simple 2 resistor divider and a battery I want to step one of the resistors by 1% or 10%.(small change sensitivity v. large change sensitivity ) I want to plot
"(Delta(Vout)/Vout)/(Delta(R)/R)"... How do I do this? Or has this question been already answered..? Cheers AG |
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Starting LTspice GUI from script file loading .sch and .cir - Linux
Hi *,
In Ubuntu with Wine I want to have a setup of 4 LTSpice GUIs started together. I'd like to have a schematic and a .cir file loaded for every instance of LTspice. Does anybody know how to load two files, a .sch and a .cir, at the start from a script? The line <env WINEPREFIX="/home/xxxx/.wine" wine C:\\Program\ Files\\LTC\\LTspiceIV\\scad3.exe -wine AAAA.sch AAAA.cir &> does not work. Thank you in advance. Axel |
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Re: Pole/Zero analysis
Tony Casey
<snip>
There is a long story to this, featuring another of P Bax's invaluable</snip> Yes, I knew that sooner or later you would send this discussion into a siding. :-) Going back to Peter Baxandall: the man was a genius, and all done without Computer Aided Disease - er, I mean Design. Tony |
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Re: General SPICE environment setup
Tony Casey
--- In LTspice@..., "martin562284" <martin.sadler@...> wrote:
Hello Martin, This was discussed a couple of weeks ago. In Linux it is easy, because you can soft link even networked libraries into the LTspice installation tree or the project directory, without fear of them being overwritten, yet they can also be shared between users, if required. For example, for the latter option, just keep a template project directory that already contains the requisite soft links, and simply replicate that for each project. Suitable archive tools can be made to de-reference the soft links for the purpose of creating zips with the required libraries for exchange and archival purposes. I figure this can possibly also be achieved in Windows now since Vista, which permits soft linked network folders (WinXP doesn't). But I haven't tried it. Regards, Tony |
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Re: Pole/Zero analysis
John Woodgate
In message <j4o6mi+dnim@...>, dated Tue, 13 Sep 2011, Tony Casey <tony@...> writes:
Of course you are correct in the case of a single MC driver, but due to poor (crossover) design, some systems exhibit ridiculously low impedance at some places in the frequency band.Some might; I know one well-known manufacturer had crossovers burn up about 40 years ago due to a 'parasitic' series-tuned circuit in the crossover than no-one had noticed. However, there is also a dynamic effect which causes high peak current demands even though the steady-state impedance is well-behaved. This effect was pointed out by Matti Otala (he of TIM ?fame?), with fairly complex examples. But Peter Baxandall pointed out that a simple RC circuit does it with a low-frequency square wave voltage applied. As, of course, LTspice will willingly demonstrate (must get back on-topic somehow!). In cases like this, it is entirely possible that the resistor improves things, but only insofar as it disguises a design failing.But 0.22 ohms is really too little, in most cases, to fix the problem. There is a long story to this, featuring another of P Bax's invaluable contributions, but it really is OT here. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK When I point to a star, please look at the star, not my finger. The star will be more interesting. |
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Re: General SPICE environment setup
--- In LTspice@..., Martin Sadler "martin562284" wrote:
--- In LTspice@..., "phoenixosu" wrote:FYI, the name of the software is "LTspice" with a lower case "s."I wish there was a way to add permanent libraries to the tool, Hear, hear! If we could have one and only one wish, this oneYou can more or less do this now if you know how, but it is a really bad idea unless you are certain you will never need to share your work with anyone else (including with yourself when you are on another computer at a later date trying to go back and recreate your now-forgotten wonder design). To share successfully, you will have to hunt down all your custom components and symbols that you have made to appear to *you* as just another part of standard LTspice. Keeping all user project files in a dedicated folder for each project allows you to easily recognize and zip together all your custom work for run-out-of-the-box sharing. Unless Mike were to a "Ferret & Zip" tool that discretely bundled up all your dangling custom bits with a single button click, this idea is better left as an unfulfilled wish. -- a.s. |
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