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Re: Looking for a IDT74CBTLV3253 model.
Gunoi Nare
Ok.... I uploaded it. "From G. .... " G.
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Re: Current Dependent Voltage Source
rmoreno.phone?wrote: ? ?"I've tried to understand how to create a current dependent voltage source but am unable to comprehend how to get my simulation circuit to work.? Is there anything available to describe in detail how to do this?" Yes; there is the LTspice Help page for H-elements (current-dependent voltage sources).? But most of the reference descriptions there are most helpful for SPICE Netlists, and are a little vague about applying the same syntax to schematic symbols. Assuming that you are using a schematic: Voltage sources are our "ammeters".? Put a voltage source (probably set to 0V, but could be non-zero if that fits the rest of your circuit) in the branch where you want to sense the current, that will control your CCVS. Add an H element where you want it.? Then right-click on the H that is by itself.? Edit that field so that it looks something like this: Vxxx yyy.y where Vxxx is the name (reference designator) of the voltage source that is the "ammeter", and yyy.y is the transresistance or gain (in ?volts/amps) that you want. Andy |
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Re: Current Dependent Voltage Source
Hello,
Please take a look to this example from our Files-section.. ? Best regards, Helmut H. Current Dependent Voltage SourceSymbol Name: H Syntax: Hxxx n+ n- <Vnam> <transresistance> This circuit element applies a voltage between nodes n+ and n-. The voltage applied is equal to the value of the transresistance times the current through the voltage source <Vnam>. Syntax: Hxxx n+ n- value={<expression>} This is an alternative syntax of the behavioral source, arbitrary behavioral voltage source, B. Syntax: Hxxx n+ n- POLY(<N>) <V1 V2 ... V3> <c0 c1 c2 c3 c4 ...>
This is an archaic means of arbitrary behavioral modeling with a polynomial. ? |
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Modelling an optoisolator
I have a requirement to model an optoisolator in LTSpice. The optoisolator has an input LED that shines light on a photovoltaic cell on the output. Current in the LED will cause light to fall on the photovoltaic cell and cause a voltage to be generated on the output. I have measured the input-current-to-output-voltage characteristics of the device - Vout=F(Iin). The transfer function F is somewhat nonlinear. I have created a table of measurements listing the output voltage for a set of specific input currents. Now I am trying to build an LTSpice model that functions similarly to the actual device.? A simple first-order approximation of the device would be a current-controlled voltage source with the transfer function defined as a table. i have tried all kinds of ways to define the table in a LTSpice current-controlled-voltage-source, but no luck. Can anyone show me how to do this? What does the spice directive look like, and where (and how) do you put it in LTSpice? A second-order model will need to take into account that output impedance will also affect the output voltage (at low impedances the output becomes more like ?a current source), but that is for another day. |
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Need help to design a transimpedance amplifier
Hello ?guys..
I want to design a trans-impedance amplifier to detect currents of the APD (in the range of 200 nA to 100 micro A). Could some one suggest me the best IC with less bias current, single supply (+5 V only) and how to design a high sensitive TIA..? (typically, for every 100 nA change in the current, 100 mV voltage should be displayed). |
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Re: DanTherm model (SOAtherm)
I just discovered the LT application video on the SOAtherm-NMOS device. ?This looks like a really neat function. ?Searching the archives comes up with a thread from last year about converting datasheet information into SOAtherm models, but it looks like MatLab is needed. ?I'm not MatLab fluent (used it once, 20 years ago), but I'd like to model the FETs I'm using in my designs. ?Does anybody have any hints/tricks/recipes for determining the values of the entries in Dan Eddleman's DanTherm model? ?The library has these elements that determine the thermal model:
? * The following two lines are customized for each DanTherm model *? .param Tambient=85 RthetaJA=50 Cheatsink=0? .param Imult=1.00E+01 Iexponent=3.00E-01 R6=3.18E-02 C6=1.77E-04 R5=1.01E-01 ?C5=2.77E-04 R4=2.74E-01 ?C4=1.60E-03 R3=8.49E-01 ?C3=8.83E-03 R2=7.34E-02 ?C2=3.30E-03 R1=1.05E-03 ?C1=1.82E-03 Do I need to contact Dan to get his modeling information? Thanks, Carl |
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Re: Looking for a IDT74CBTLV3253 model.
Gunoi Nare wrote: ? ?"yes I refer to the Digital lib.i attach here a simple counter .asc file . Please tell me what I do wrong." No attached files!? They are removed by Yahoo's servers. ?(Apparently, a lot of other garbage was not removed.) Please upload your .asc file to the "Temp" folder: Andy |
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Re: Looking for a IDT74CBTLV3253 model.
Hello Gunoi,
Please take a look to the example file here. It shows how to use the digital devices in LTspice. DIGITAL_A_DEVICES_1.ASC ? ?EXAMPLE: Place an AND Right mouse click on it.? A dialog will popup, SpiceLIne: Vhigh=3.3 Vlow=0 Ref=1.65 SpiceLIne2: Td=1n Trise=1n This AND has 0V/3.3V output, input threshold 1.65V, delay 1ns, rise and fall time 1n. Use the nmos4 and pmos4 for the switch. Connect both in parallel as shown in the datasheet's schematic. Connect the substrate of the nmos4 to GND.?Connect the substrate of the pmos4 to VCC(3.3V). Best regards, Helmut |
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Re: Looking for a IDT74CBTLV3253 model.
Gunoi Nare
Danke Helmut This is more than i bargained for :( G.
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Re: Looking for a IDT74CBTLV3253 model.
Gunoi Nare
Thank yu, Andy.
yes I refer to the Digital lib.i attach here a simple counter .asc file . Please tell me what I do wrong. G From: "Andy ai.egrps@... [LTspice]" <LTspice@...> To: [LTspice] group <LTspice@...> Sent: Sunday, July 31, 2016 6:00 PM Subject: Re: [LTspice] Looking for a IDT74CBTLV3253 model. ? Gunoiar?wrote: ? ?"Also, I observe that the logic library contains only the graphical description on certain ?devices but lacks the simulation definitions." I am confused what you mean by that. Are you talking about the logic parts in the [Digital] section of the library?? They all have actual models already.? What's missing are the parameters that MAY need to be set, to get realistic performance. I am not aware of logic parts in the LTspice library that are graphical symbols only. Some analog parts, e.g., MESFETs, SCRs, IGBTs, valves/tubes, and varistors, are symbols only and you must provide the model. 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Re: course of HOWTO build models like (sanken) STR-A6100
Hi I'm creating a UCC25600 behavorial model, just as a challenge, and have almost completed it. I used switches for the? push pull drivers but I'd like to use mosfets. I've tested part of it?using the TI EVM schematic. Output driver waveform is square with dead time. But the?circuit has trouble converging.?Driver output might be too square... :-) stay tuned... |
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Re: INA282
At 08:41 AM (-0700) 7/27/2016, riscy00 wrote:
---------- Original Message ---------- Please see folder RiscyLTC---------- End of Original Message ---------- Strange... I tried the TRAN CIR file in PSpice... it barfed. Tried it with LTspice IV (with call to nom.lib commented out), it runs, though with an output list of PWL points it didn't like! In today's typically screwed up models, the TI INA282 model qualifies as gross over-kill... the model makers are so intent on capturing every little minutiae of their device that they fail to note that the object is to have the model run in a system which includes other devices... AND run on other simulators than PSpice or TINA. When I have some time I'll try to simplify it to the point where it can run anywhere. ...Jim Thompson Web Site: <> |
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Re: course of HOWTO build models like (sanken) STR-A6100
Hi, Tamura Kentai:
The example is NOT suitable to used in the real world, it's just a demo to see if the STR-A6100 could behave well. It's absolutely not suggested to use it in real world. Especially, the transformer was just roughly put parameters, it's meaningless and absolutely NOT proper-tunned. And the model of STR-A6100 is just simple sub-circuit for behavior reference. I really hope to see the day, those companies could release those models of SPICE to their customers to spread their application of those products. For example, if I never use the STR-A6100 IC, I would never know there is a company called (sanken) exists in the world. Thank you for your opinions. Best regards.? |
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Re: course of HOWTO build models like (sanken) STR-A6100
ericsson:
よろしく、お垳いします Good day. It's excited here to see someone who is interested in the (sanken) product STR-A6100 series. The Japan's companies seems not good at promotion of their products though they have good qualities. I personally think they should release more SPICE tool & support in simulation. About the STR-A6100, may I ask a question, ?could the example really be used in the real world ? Is that an exact design instance ? Thank you とも、ありがとう、ございます 弥翫宗湊 Tamura Kentai |
Nicholas Jankowski
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