i have only used one transistor. I have used the beta value which was given in the ltspiceNo two transistors are the same. The actual value of beta will be different. Your simulation might not model the part exactly.
ok,but it can be clearly seen that operating voltage is less than calculated(5V).My point is, simulation might not model the real part exactly.
Your simulation shows the cursor position. It does not fall exactly on the load line.
I don't get it, what u mean by the standard.bjt?hi V,
This is what I see with your transistor, compared with the 2N3904 300 from the standard.bjt.
EView attachment 253945View attachment 253946
i used the standard formulas...How did you calculate the op?
hi,I don't get it, what u mean by the standard.bjt?
and what are these graph saying.....can u please explain me in detail...
what does it mean by spread in parameter?hi,
The standard.bjt are the bjt files in your LTS folders under lib/cmp.
The plots are showing there is a spread in the parameters for a particular transistor type.
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yes, in .step i vary the beta value and in .meas i want to find the value of Ic for different beta values.(spice error log file)A couple of points:
- The BJT model parameter "BF" is NOT the Beta value, it is the "Beta Factor". It is part of a calculation that will determine the actual performance in the simulation.
- It seems suspect that you are using the Letter B for two different purposes, in both the .step and the .measure statements.
sorry, but i still don't get it what r u trying to say,can u plz explain more
That is not what your statement is asking the simulator to do. You apparently did not read the LTspice Help file with much diligence. See my edit to post #15 as I was curious enough about your intention. Beta and Ic(q1) are NOT the same thing. The calculated value of Beta at any point is the instantaneous collector current divided by the instantaneous base current.yes, in .step i vary the beta value and in .meas i want to find the value of Ic for different beta values.(spice error log file)
That is not what your statement is asking the simulator to do. You apparently did not read the LTspice Help file with much diligence. See my edit to post #15 as I was curious enough about your intention. Beta and Ic(q1) are NOT the same thing. The calculated value of Beta at any point is the instantaneous collector current divided by the instantaneous base current.
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