Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- LTspice
- Messages
Search
|
Re: Regarding LT1521-5
John Woodgate
In message <1400658314.45008.YahooMailNeo@...>,
dated Wed, 21 May 2014, "Kesi Kumar kesikumar.iitg@... [LTspice]" <LTspice@...> writes: i want discrete circuit dirgram of LT1521-5 , i have block digram ofThe information you require is almost certainly confidential. You should explain your requirements to your Field Service Engineer or other formal contact at LT. In any case, you need to discuss the use of ANY electronic device in an implanted device with the manufacturer. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK |
|
Regarding LT1521-5
i want discrete circuit dirgram of LT1521-5 , i have block digram of LT1521-5 but i dont want block digram as i m working on implant device so i cannot block diagram so, can anybody suggest me from where should i get whole circuit digram of LT1521-5. I had seen ? details ...but actually i want searching for discrete diagram ....can anybody give me right path to proceed.. Thank You Kesi Kumar ? |
|
Re: Current Step Algorithm
> It is maybe faster to not use compares but formulate all as > float-operations: mul, div. That's not entirely true: multiplications and divisions are much slower compared to conditional checks, which may be the fastest, computational-wise. Still, I'll stick to what I said related to not using behavioural sources but, instead, E or G sources within a subcircuit. As they say, "your mileage may vary". Vlad ______________________ -- holding, among others: a universal analog/digital filter, block-level models for power electronics (and not only), math blocks with a more stream-lined approach, some digital ADC, DAC, (synchronous-)counter, JKflop, etc. |
|
Re: Photodiode
Hello,
A photo diode is simply a large area diode. The large area results in large capacitance Cjo. The incident light will be converted to current in the photo diode. Thus the second part of the model is simply a current source with current proportional to the amount of received light. This current source is parallel to this diode. The file "all_files.htm" with links to every file is here: Search in all_files.htm with "photo" and open/run the examples you will find. The do a second search with "solar". Best regards, Helmut |
|
Re: Analog Switch model with charge injection?
Hello,
The most simple solution will be one or two capacitors. One between the control voltage and the switch-input and the other between the control voltage and the switch-output. You can add some voltage dependence if you use a diode(Cjo) in reverse operation instead of a fixed capacitance. Best regards, Helmut |
|
Re: Current Step Algorithm
ehydra
Hi JH -
toggle quoted message
Show quoted text
Sorry, I can't help you because it looks to complicated what you have done. Maybe it helps if you post the whole circuit. Even then the result thru help is not a whole faster reconfiguration but with new parameter settings. tripdt etc. It is maybe faster to not use compares but formulate all as float-operations: mul, div. max/min is not in the help-file because the whole counter circuit is a hack and surely not very liked by Mike. - H. tindelsurf@... [LTspice] schrieb: Henry, |
|
Analog Switch model with charge injection?
I am looking for a model of, for example, a DG201 analog switch, that models the actual MOSFETS used in the switch. ?I would like the simulation to show the charge injection that takes place during switching. ?Any other analog switch of this generation would be fine, too. ?I know that Analog Devices has models that use "switch" elements, but I am looking for something that is a little more real. ?Does anyone know about these parts? Would someone know ?of a MOSFET model that is good for this generation?? Thanks in advance ? |
|
Re: Current Step Algorithm
Henry,
I was able to figure it out with your help... and got my simulation time down to ~4.25 minutes, a great improvement... but now I at least know that the count table isn't what is slowing me down significantly.? I just have a complex loop.? And as Helmut pointed out... I knew the DFF solution wasn't very stable. One final question: is there a good way to speed up the transitions of the Sample and Holds?? I tried using td/trise/tfall, but it didn't appear to effect anything. Thanks for giving me the hint on the max/min counts too... that helped a lot!? I couldn't find anything in the help files about that! Love this place - you guys always get me pointed the right direction. Just FYI - if anyone ever reads this again (the yahoo search sucks, so I doubt it)... I was able to make Henry's suggestion a window comparator by setting Vdir to be centered about 0 and making the following statement for B1: V=if(V(dir)<-0.05,-1,if(V(dir)>0.05,1,0)).? I also speed up the clock to 1k to get my 1ms count increments. JH |
|
Re: Photodiode
Emre wrote: ? ?"so i need photodiode model. But i couldn't found any photodiode spice model."
You could have looked for photodiode SPICE models in this group's Files area. ?There are several there already.
Go to the [LTspice] group's main webpage and read the instructions there about downloading and searching the "Table of Contents" list. ?Then search it for "photo" and see what comes up. ?(Don't search only for "photodiode" because that won't find "photo diode" or "photo-diode" etc.) ?When you find a link in that listing, click on it and your web browser will take you to the directory where the file can then be downloaded.
And as Dan says, go directly to the manufacturer's website and look for SPICE models.
Regards,
Andy |
|
Re: Photodiode
If you are trying to simulate the behaviour of a photo diode used as a radiation detector - Good Luck!
You can find PSpice models for a number of photodiodes at Vishays home page. But! You can't just state - a photo diode! There are different underlying technologies that are exposed to light. All with a different behaviour. Grab one of the models in Vishays zip archive amd modify to your diode spec. Cheers Dan Andersson, M0DFI On 20 May 2014 06:06:06 -0700 "emreozupek@... [LTspice]" <LTspice@...> wrote: Hello everyone, |
|
Re: incrementable voltage counter
ehydra
I think a positive real td is implicit here because if not the CLK input can't be a clock. One of it's phase would be removed and the signal would be static thereafter.
toggle quoted message
Show quoted text
Or? - H. Vlad imbvlad@... [LTspice] schrieb: I forgot to say it: you should add one of |
|
Re: incrementable voltage counter
ehydra
Thanks Vlad! I'm proud of it.
toggle quoted message
Show quoted text
One can add limits on both extremes. I upload an example. So add a programmable divider, phasedetector and a VCO and you have a digital PLL. It shows all possible states. Another fine idea is to 'substract' two of it (add a b-source which minus the outputs) for having a add/subb counter with two separate CLK inputs. Don't forget it won't work if the float-variable mantissa overflows! 23bits good for 8 millions hits. About your suggestions I have to think. Thanks. - H. Vlad imbvlad@... [LTspice] schrieb: Look for counter_3.zip !Nice job! If you want to avoid the behavioural voltage (not necessarily, |
|
Re: incrementable voltage counter
I forgot to say it: you should add one of
td/trise/tfall/tau/[Rout,Cout] (as Helmut reminded recently) to at least one of the A devices and the inverter. As it is now, it works but, because of the loop, it may cause problems in larger circuits. This is similar to the DFLOP problem: if td=0 then _Q and D will have the same states, but _Q needs to change because of D, hence the "time step too small" errors. Vlad ______________________ ltspicegoodies.ltwiki.org -- holding, among others: a universal analog/digital filter, block-level models for power electronics (and not only), math blocks with a more stream-lined approach, some digital ADC, DAC, (synchronous-)counter, JKflop, etc. |
|
Re: incrementable voltage counter
> Look for counter_3.zip ! Nice job! If you want to avoid the behavioural voltage (not necessarily, but recommended), you could replace it with an E or a G source with "table(500m,-1,501m,1)" and then you're as fast as it gets. My choice would be a G source with A2's output as resistance (which will have to be specified to Rout=1, it defaults to 1k).
Vlad ______________________ -- holding, among others: a universal analog/digital filter, block-level models for power electronics (and not only), math blocks with a more stream-lined approach, some digital ADC, DAC, (synchronous-)counter, JKflop, etc. |
|
Re: incrementable voltage counter
Won't those make for far too many devices compared to Henry's circuit? Vlad ______________________ -- holding, among others: a universal analog/digital filter, block-level models for power electronics (and not only), math blocks with a more stream-lined approach, some digital ADC, DAC, (synchronous-)counter, JKflop, etc. |
|
Re: PA10M schematic problem (izzydad2000)
I think he replied to his own upload that he managed to fix it, it doesn't appear in normal conversations but in standard "upload" messages. I could be wrong, though. Vlad ______________________ -- holding, among others: a universal analog/digital filter, block-level models for power electronics (and not only), math blocks with a more stream-lined approach, some digital ADC, DAC, (synchronous-)counter, JKflop, etc. |
|
Re: incrementable voltage counter
Why not a couple of flip-flops (in a cascade counter) and an R-2R ladder?
toggle quoted message
Show quoted text
Jim Wagner Oregon Research Electronics On May 19, 2014, at 9:59 PM, helmutsennewald@... [LTspice] wrote:
|
to navigate to use esc to dismiss