开云体育

A correctly made model would not care whether the voltages are +/-15, or +30, or (+20 & -10) volts.? It's all just relative.? From the op-amp's perspective, the only difference is where the external

I was considering the 15 V unbalance, not the absolute values. But it was just a guess. A generic model would probably not show that, or not work at all. -- This email has been checked for viruses by

Jim, Your schematic in the photo you uploaded ( /g/LTspice/album?id=301539 ) shows two NPN transistors, but the description that accompanies it mentions "2N3904/6" which implies that

Sorry, I also should have said this:? Ground the Emitter and connect the negative collector voltage source to the transistor's collector. Obviously, the graph you uploaded needs to be inverted (or

Sweep the collector voltage. Sweep the base current over a number of steps. Do not do this as a .TRAN simulation. In your circuit, remove R1, R2, and R3.? Replace V1 with a current source. Use one

Andy, Thanks again for all your help and suggestions. And yes, test.asc is just that – a schematic for testing the circuit in another schematic. The schematic I didn’t post was the one I was

I noticed that the generic SPICE macromodel for the ADA4084 states that it was tested only with 30V (+/-15V) supplies. The built-in LTspice model does not say.? But I would hope that it works ALMOST

Compared to the netlist in btdeboi's?message ( /g/LTspice/message/159418 ) , there is one omission in your schematic.? Change the formula of the B-source B1, from this: to this:

Hello , in the attacehd zipped file I have created a basic PNP biasing circuit . The simultion is in time domain , I added plots of different ports. Is a there a way by clever type of sweep to

It might not be so good with +20V and -5V rails. I doubt that is tested. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

Yes, I know that was Mike's argument, and of course he is notoriously unbiddable. So I suggest it could be an option in the symbol creating page, 'Do not add full path to the model file'. Or the

Hello Andy, it's ok now, I move it to the good folder.

This is what happens if you don't start a new thread: Email threads. </g/LTspice/photo/301567/3901017?p=Name%2C%2C%2C20%2C1%2C0%2C0> Changing the subject doesn't affect how they are

I tried to simulate a negative resistance using btdeboi's netlist, but I can't complete the schematic. Can you help me complete it ? See Negative Conductance.asc

Chris, Analog Devices has another SPICE model for the ADA4084, downloadable from the part's webpage.? The model that comes with LTspice has elements that require LTspice.? The downloadable model is

Chris, Here is another thing that seems to help:? Add a pull-up or pull-down resistor between the output of the op-amp and its V+ or V- supply.? I used a 10K resistor and that seemed to do a nice

What are the _IN and _OUT supplies?? I'm guessing they are on schematics you have but did not upload? Andy ( #DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2 )

Chris, These kinds of internal "oscillations" are more mathematical, not real.? Has nothing to do with being unity-gain stable.? I just want to suggest the possibility of some sort of numerical

Hi Andy, Thank you for all your help. I had wondered if oscillations were the cause the problem, and were associated with the ADA4084-2 model since replacing it with opamp.sub made things run

Hi Andy and John, To answer John’s question: Both the LM317 circuit and the “M1” circuits are voltage-controlled current sources whose loads are the 0V DC voltage sources whose names terminate