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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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