| Electronics > Beginners |
| constant current source design |
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| Arjunan M R:
--- Quote from: Jay_Diddy_B on June 03, 2019, 01:08:03 pm --- --- Quote from: Arjunan M R on June 03, 2019, 01:00:59 pm ---Thanks. Which software did you use for simulating the current mirror? --- End quote --- Hi I used LTspice. You can download it from here: Link: https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html (I have the changed the colours from the default values, so I have a white background. Normally it is grey for the schematics and black for the waveforms. This is why it might look a little different). Regards, Jay_Diddy_B --- End quote --- i already have lt spice.I didn't recognize because of the background color. |
| Arjunan M R:
How did you define temperature? |
| Jay_Diddy_B:
--- Quote from: Arjunan M R on June 03, 2019, 01:29:29 pm ---How did you define temperature? --- End quote --- Hi, If you [CTRL] [RIGHT CLICK] on a part you will see a dialogue box like this: I have entered temp=75 on the line and [RIGHT CLICK] the Vis box, to make it visible on the schematic. The default temperature is 25C. Regards, Jay_Diddy_B |
| Arjunan M R:
; Thanks. How did you measure current vs voltage. |
| Zero999:
It's also possible to do a temperature sweep. http://electronicsbeliever.com/how-to-sweep-temperature-in-ltspice-with-step-by-step-tutorials/ https://www.eevblog.com/forum/blog/eevblog-301-ltspice-temperature-sweep-tutorial/ Another option is to set the temp to a variable and use the .step param command. For example: In the component attribute editor, as mentioned above enter: temp={temp_Q1} Add a spice directive to the schematic by clicking the .op icon on the tool bar and enter: .step param temp_Q1 10 90 20 That will then perform the simulation with Q1 at temperatures ranging from 10 to 90 degrees, in 20 degree increments. http://electronicsbeliever.com/how-to-sweep-temperature-in-ltspice-with-step-by-step-tutorials/ https://www.eevblog.com/forum/blog/eevblog-301-ltspice-temperature-sweep-tutorial/ https://www.analog.com/en/technical-articles/ltspice-using-the-step-command-to-perform-repeated-analysis.html |
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