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Re: abcd for cable modeling
John Woodgate
In message <ksu4kg+9r5j@...>, dated Fri, 26 Jul 2013, desi2209 <desi0985@...> writes:
I'm trying to model a cable in ltspice. I read some articles and everybody talk about the implementation of the ABCD matrix in spice. I will do the same but i don't understand how can i do...There is a good article about 2-port networks and the ABCD matrix at: but the 'ABCD matrix' is a very general concept and in order to do simulations you have to decide which particular matrix you want to use, h, k, z, y, a, b or s. If it's a high-frequency cable, you probably want to use the s-matrix. You need to search Files => Tables of Contents => All Files on the list's web site for 's-parameters', using your browser's search or 'Find' facility. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Why is the stapler always empty just when you want it? John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK |
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Plot Settings
ve3tou
When doing repeated simulations of a circuit with (for instance)
different parameter steps, the plot settings revert to default settings each time, so I have to do: plot settings/reload plot settings. This works, but is there a way to make it re-use the settings without doing this each time? Thanks Bob |
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Re: potentiometer
Thanks for your help.
Kind Regards, Mike From: "Helmut" <helmutsennewald@...> To: LTspice@... Date: 25/07/2013 18:49 Subject: [LTspice] Re: potentiometer Sent by: LTspice@... --- In LTspice@..., Michael.Harris@... wrote: the library symbols.Hello Mike, When you search in the mentioned "all_files.htm" you will find this place below. Files > Lib > Potentiometer > potentiometer.zip Just unzip it in a folder and run the example schematic(.asc). The zip-file contains the symbol potentiometer.asy and a subcircuit potentiometer.sub. Copy these two files into the folders of your schematics if you need a potentiometer. Best regards, Helmut |
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Re: potentiometer
Hi,
What you want the symbol of poteniometer. If yes reply ? With Regards B.Vengadassalabady ________________________________ From: "Michael.Harris@..." <Michael.Harris@...> To: LTspice@... Sent: Thursday, 25 July 2013 9:24 PM Subject: [LTspice] potentiometer ? Hi, I am looking for a potentiometer component but can not see one within the library symbols. Does anyone know where I can find one? Kind Regards, Mike |
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Re: Dead Time
Hi Anirban
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I needed to do this with a class D audio amp to actually get overlap for continuous conduction, needed to eliminate cross over distortion. (separate inductors for each fet) If youre using the comparator with a ramp or triangle signal, use a 2nd comparator with a slightly offset comparison voltage. The delay of one crossing to the 2nd gives a very reliable dead time. Other wise, use a one shot w/ some logic to get the delay. Al D. On 07/25/2013 06:53 PM, anirban wrote:
I need to introduce a dead time between two complementart PWM pulse, --
AC2CL I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything. - Nikola Tesla |
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Re: Article on EDN by Mike Robbins
--- In LTspice@..., Howard Hansen <hrhan@...> wrote:
To be honest, I just searched the group for "alternate solver" and looked at the earliest messages. The fact that the alternate solver has higher internal accuracy has been mentioned in this group quite a number of times. Best regards, Frank |
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Dead Time
Hi,
I need to introduce a dead time between two complementart PWM pulse, trying to turn on the high and low side of a half h-bridge using the ouput an inverted output of LTC1714 hi-speed comparator. The PWM pulses are acting great just need to have something to inject the dead time between the VOUT and VOUT! of the pulses which will then be sent to the input drive pins of the half bridge drivers. Thanks, Anirban. |
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.AC friendly up/down sampling
Hello
While searching for a good solution to .AC viewing of interpolation and decimation, among the results (simple multiplication, delays and VCCS/VS, VCCS and behavioural resistor), the varistor seemed to be the best approach. The Filter can now be viewed in frequency domain, too, for interpolation/decimation. For those interested, the schematic with the up-/downsampling section is here: Files/Filter/Filter/Up_Down_Sampling.asc Vlad |
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Re: HPCL-2232 LIB or SUB file
I know I shouldn't have washed my hands. They are not doing what I want them to do.
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The part number is HCLP2232. Dennis --- In LTspice@..., "dfoulke_belcan" <dfoulke_belcan@...> wrote:
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Re: HPCL-2232 LIB or SUB file
--- In LTspice@..., Macy <macy@...> wrote:
The part number is HCLP2232. Dennis |
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Re: Article on EDN by Mike Robbins
Hello Frank,
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Thank you for posting the link to the message Mike posted when the alternate solver was first released. A couple of tidbits in the message were especially interesting. One, "It is the hardest for other programs to duplicate." Two, "Basically two copies of the executable in LTspice" You must have a super memory to be able to recall a message that old in the LTspice message files. Howard On 7/25/2013 3:02 AM, Frank Wiedmann wrote:
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Re: potentiometer
--- In LTspice@..., Michael.Harris@... wrote:
Hello Mike, When you search in the mentioned "all_files.htm" you will find this place below. Files > Lib > Potentiometer > potentiometer.zip Just unzip it in a folder and run the example schematic(.asc). The zip-file contains the symbol potentiometer.asy and a subcircuit potentiometer.sub. Copy these two files into the folders of your schematics if you need a potentiometer. Best regards, Helmut |
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Re: potentiometer
Indeed, there is no potentiometer as a standard schematic symbol, built into LTspice. Does anyone know where I can find one?Sure. You can find them in the [LTspice] YahooGroup. Oh wait, that's where you are! Many people have created them already. If you really need a pot. symbol on your schematic, search this forum and you will find them. You can search through the message archive, but that would be tedious. I recommend downloading and opening this file: Files > Tables of Contents > all_files.htm and then search for "potentiometer.asy" or just "potentiometer". If you don't actually need the symbol, remember that a pot. is just two resistors in series. You can get by with just a pair of resistors and it will simulate exactly the same. Regards, Andy |
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Re: LTspice "cannot find files" on Windows 7 (only)
John Woodgate
In message <ksr6oq+m6c0@...>, dated Thu, 25 Jul 2013, sct5033 <sct12@...> writes:
The MS web site today says that SP1 is current for Win 7. ; =win7 <Sorry, confused. There was supposed to be an SP2 on the way, but when??? Win 8 seems to be taking all the resources at present. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Why is the stapler always empty just when you want it? John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK |
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Re: LTspice "cannot find files" on Windows 7 (only)
The MS web site today says that SP1 is current for Win 7.
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; =win7 <; s=win7> --- In LTspice@..., John Woodgate wrote:
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Re: Article on EDN by Mike Robbins
--- In LTspice@..., Howard Hansen <hrhan@...> wrote:
According to Mike Engelhardt, "it runs at about half the simulation speed but 1000x more accurately as far as the matrix solution goes", see (that message is from June 16, 2003, more than 10 years ago!). Best regards, Frank |
Frank Wiedmann