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Re: low noise amplifier
==>HELP==>F.A.Q==>Third-party Models-->
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..... Example for a 3-pin NPN transistor but defined with a .SUBCKT statement: ..... Bordodynov. 10.07.2013, 13:55, "Ferdian Cahyodwiputro" <ferdiancahyodwiputro@...>: thank you for your information by the way so i must create new design symbol with this parameter? |
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Re: low noise amplifier
Ferdian Cahyodwiputro
thank you for your information by the way so i must create new design symbol with this parameter?
________________________________ From: §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó <BordodunovAlex@...> To: "LTspice@..." <ltspice@...> Sent: Wednesday, July 10, 2013 12:21 PM Subject: Re: [LTspice] low noise amplifier ? Hi. Model: .SUBCKT q2SC5006_v111 7 8 9 Ccb 2 5 58f Cce 2 6 87f Cbe 7 9 0.67f Cb 1 2 180f Ce 2 3 180f Lb 5 7 1.09n Lc 2 8 0.79n Le 6 9 0.99n Lb2 1 5 0.004n Le2 3 6 0.004n Qnpn 2 1 3 q2SC5006_v111_M .MODEL q2SC5006_v111_M NPN +(IS=616e-18 BF=161 NF=0.99 VAF=50.0 + IKF=1.5 BR=14.4 NR=0.99 VAR=2.4 + IKR=0.32 ISE=38.2e-14 NE=2.19 ISC=80e-17 + NC=1.0 RB=4.37 IRB=759e-6 RBM=2.23 + RE=0.4 RC=5.0 CJE=2.21p VJE=0.954 + MJE=0.408 CJC=1p VJC=0.667 MJC=0.408 + XCJC=0.8 + FC=0.50 TF=20.0e-12 XTF=1e-3 VTF=0.668 +ITF=9.7 TR=0 PTF=40 EG=1.11 + XTI=3.0 XTB=0) .ENDS q2SC5006_v111 Bordodynov. 10.07.2013, 08:20, "ferdiancahyodwiputro" <ferdiancahyodwiputro@...>: dear everyone [Non-text portions of this message have been removed] |
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Re: A TVS does not work with load dump test??
I got it, thanks for all your suggestions.
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--- In LTspice@..., Jim Wagner <wagnejam99@...> wrote:
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Re: locking the graph vertical axis
Tony Casey
--- In LTspice@..., Kevin Cobley <kevin.cobley@...> wrote:
Hello Kevin, This topic comes up regularly (last week in fact). The solution to this is once you have adjusted the scales to your satisfaction, save the plot settings: - Make sure the plot window is active - Menu=>Plot Settings=>Save Plot Settings - After each simulation, Menu=>Plot Settings=>Reload Plot Settings It is very helpful to assign a hot key to this command - many people use the spacebar. To do this, from the control panel (hammer icon): Waveforms tab=>Hot Keys You can assign a large number of menu commands to hot keys; many are pre-assigned, by default. Regards, Tony |
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Re: A TVS does not work with load dump test??
Important intuitive point - TVS does not have sharp breakdown like a zener.
Note, carefully Bordodynov's specs. Breakdown (probably at 10-100mA) of 26.7V to 29.5V. Conduction voltage rises 9V by the time the conduction current rises to 15.4A. Of course, no ordinary zener can handle that sort of current. Jim Wagner Oregon Research Electronics On Jul 9, 2013, at 11:03 PM, §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó wrote: All you get it right. Carefully study the documentation for the complete set. [Non-text portions of this message have been removed] |
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Re: A TVS does not work with load dump test??
All you get it right. Carefully study the documentation for the complete set.
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Datasheet ----> Breakdown Voltage Vbr=26.7- 29.5V, Clamping Voltage Vc=38.9V at IPPM=15.4A Bordodynov. 10.07.2013, 09:46, "eqmqiq" <g9512728@...>: Thanks for everyone's suggestion, I put a new TVS from the LTspice library(SMBJ24CA) and set a series resistance(0.5 ohm) for the voltage source. |
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Re: A TVS does not work with load dump test??
Thanks for everyone's suggestion, I put a new TVS from the LTspice library(SMBJ24CA) and set a series resistance(0.5 ohm) for the voltage source.
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the simulation result shows the voltage is clamped at 36V, but the breakdown voltage of the TVS is 24V, I don't understand why...? wrong parameter setting?? I update the asc file to TEMP folder with the same file name " TVS_clamp.asc" --- In LTspice@..., Andy <Andrew.Ingraham@...> wrote:
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Re: low noise amplifier
Hi.
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Model: .SUBCKT q2SC5006_v111 7 8 9 Ccb 2 5 58f Cce 2 6 87f Cbe 7 9 0.67f Cb 1 2 180f Ce 2 3 180f Lb 5 7 1.09n Lc 2 8 0.79n Le 6 9 0.99n Lb2 1 5 0.004n Le2 3 6 0.004n Qnpn 2 1 3 q2SC5006_v111_M .MODEL q2SC5006_v111_M NPN +(IS=616e-18 BF=161 NF=0.99 VAF=50.0 + IKF=1.5 BR=14.4 NR=0.99 VAR=2.4 + IKR=0.32 ISE=38.2e-14 NE=2.19 ISC=80e-17 + NC=1.0 RB=4.37 IRB=759e-6 RBM=2.23 + RE=0.4 RC=5.0 CJE=2.21p VJE=0.954 + MJE=0.408 CJC=1p VJC=0.667 MJC=0.408 + XCJC=0.8 + FC=0.50 TF=20.0e-12 XTF=1e-3 VTF=0.668 +ITF=9.7 TR=0 PTF=40 EG=1.11 + XTI=3.0 XTB=0) .ENDS q2SC5006_v111 Bordodynov. 10.07.2013, 08:20, "ferdiancahyodwiputro" <ferdiancahyodwiputro@...>: dear everyone |
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Re: A TVS does not work with load dump test??
Everything said here is correct. The voltage source has precisely zero
output resistance, so it will sustain the driven voltage at whatever current, no matter how hard the TVS tries to shunt it. However, the other thing I find noteworthy is that your TVS is conducting hundreds of amps even with the normal operating voltage (12.8V) when there is no spike. I do not think you have set up its model parameters correctly. Despite the fact that you have a TVS schematic symbol, the parameters you gave it are for an ordinary silicon diode. LTspice comes with two TVS diodes in its standard diode library. They use different parameters than the ones you've specified. Regards, Andy |
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Re: A TVS does not work with load dump test??
The voltage source is virtually ideal; it?has virtually no output impedance, so there is nothing across which to drop the voltage and it can supply virtually infinite current. The current through the TVS is limited by its own impedance. If you look at the current through the TVS, you will see that it is over 800 Amps. If you add some parasitic series resistance to the voltage source, like a real voltage source will have, you will see that the TVS does, indeed, clamp the voltage.
? ?? - Philip ________________________________ From: eqmqiq <g9512728@...> To: LTspice@... Sent: Tuesday, July 9, 2013 8:07 PM Subject: [LTspice] Re: A TVS does not work with load dump test?? ? Hi, I have already put the file into TEMP folder, the file name is "TVS_clamp.asc", thanks a lot for your help!! --- In mailto:LTspice%40yahoogroups.com, ¨¢???????? ?????????¡Á <BordodunovAlex@...> wrote:
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Re: A TVS does not work with load dump test??
Hi, I have already put the file into TEMP folder, the file name is "TVS_clamp.asc", thanks a lot for your help!!
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--- In LTspice@..., ¨¢???????� ?????????¡Á <BordodunovAlex@...> wrote:
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Re: inductance with a permeability in dependency of frequency
--- In LTspice@..., "sawreyrw" <sawreyrw@...> wrote:
The permeability of some magnetic core materials is highly frequency-dependent - a good example is the amorphous materials marketed as parts for common-mode chokes. At common test frequencies, these may measure ten to 100 times their effective inductance when applied in the narrow-band conducted emissions frequency range (100KHz-1MHz), where the impedance is most critical. RL |
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Re: OT/Left Field...
For the person who must run LTspice on a tablet there is the Microsoft
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Surface Pro. See: <> For comparison a 128Gb Iipad price is $799. Howard On 7/9/2013 12:40 PM, Andy wrote:
As you may know, Mike Engelhardt has said before that LTspice isn't going |
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Re: arbitrary solar cell model
What made your netlist confusing to me, where a schematic would have helped, is figuring out the interconnections between the subcircuits, and between them and the other elements. Having nodes marked as "OUTPUT" that are actually inputs to the subcircuit, does not help. Your original note talked about both series and parallel connections, so I expected to see both. Not seeing that, I had to do a bunch of tracing, mentally re-constructing the missing schematic, to figure out whether this was the series case or the parallel case. So a schematic definitely would have helped. It would have made it less confusing, not more. actually the output should not have the distortion in -1.8kA ! and it should continue constant like a diode :)But you never described how this "distortion" manifests itself. Specifically, what did LTspice calculate that differed from your hand calculations of your formulas at the same operating point? (Indeed, did you do any hand calculations at the point or points in question, that show what the signal or signals ought to be?) Saying that signals look funny is one thing. Saying that they are incorrect requires some proof. You have not offered any proof that LTspice's findings are incorrect. In doing that, I think that you would probably find where the error is. Regards. Andy |
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Re: arbitrary solar cell model
--- In LTspice@..., "hamed" <l0st_l0rd@...> wrote:
Agree, but it is teditious to debug and/or examine a *.CIR file. No one is interested in a .cir file. - as Rick sawreyrw said. No one will do that job for you. So if you cannot transform the *.CIR file to an *.ASC schematic you will not get much help! hws |
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Re: File of where the keyboard shortcuts are stored
scad3.ini is now named LTspiceIV.ini. I believe its location is $APPDATA$\LTspiceIV.ini. The exact location of $APPDATA$ is dependent on your version of Windows. On this computer, it defaults to C:\Users\<username>\AppData\Roaming\. Regards, Andy |
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File of where the keyboard shortcuts are stored
Hello. I once knew how to transfer the keyboard shortcuts from my desktop to my laptop of LTspice. I have searched for it and found instructions that say that a scad3.ini file is located in Windows, but that may be old...there is not such file.
Does anyone know where the keyboard shortcuts are stored, so that I may simply copy them to my other computer? Thanks for your help! |
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Re: arbitrary solar cell model
hamed <l0st_l0rd@...> wrote:
the reason that I use arbitrary model not a standard diode is that I cannot control temperature change for each solar cell in diode model.You can. See the Help utility: LTspice IV > LTspice > Circuit Elements > D. Diode Syntax: Dnnn anode cathode <model> [area] [off] [m=<val>] [n=<val>] [temp=<value>] See that last expression? That is the temperature you want that particular diode instance to have. It overrides the global temperature setting. Each diode can have its own temperature. (Didn't someone else in this thread already say that?) Regards, Andy |
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Re: arbitrary solar cell model
Dear Fred
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Thank you very much for your answer. the reason that I use arbitrary model not a standard diode is that I cannot control temperature change for each solar cell in diode model. Furthermore, the reason that grounds are different is that two cells are in series. Actually I should say that I am not so good in schematics environment and I am used to netlists while I can control the nodes easier. In this model by varying the temperature of each cell most of elements values will change and it is the reason that I cannot use the standard diode model. Kind regards Hamed --- In LTspice@..., "qrx3" <fredh@...> wrote:
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