Is There Any CSV Current Source Block? SOLVED

Except for CSV Voltage Source, Is There Any CSV Current Source Block? I need it to model a piezoelectric sensor as an current input (arbitrary waveform) for other readout circuit design.

Thanks in advance if someone can help.

James

by JamesWang
July 03, 2020

What a really great question - I found out a lot about CIRCUITLAB! (I was unable to find an element like CSV current source).

Try this procedure (it works on my system):

1] Run simulation "CSV Voltage source Example" https://www.circuitlab.com/editor/#?id=7mzk9j BUT with only one output V(PWS_CSV_OUT).

2] Export the results as a CSV file (at the top right of the Transient Analysis graph "Export Plot CSV").

3] Open the CSV file in a text editor. Copy the data points WITHOUT the final comma.

4] Paste the data inside the brackets of PWS() in the current source. (Magically, the LF characters disappear).

5] Check this example I_source_control https://www.circuitlab.com/editor/#?id=49ytmx28mg38

Note: I don't know the size limit for expressions such as PWL() and PWS(). In the example there are 250 data points in a file of 5k5bytes.

Happy experiments!

by EF82
July 03, 2020

2 Answers

Answer by mrobbins

Another approach is to use the CSV Voltage Source to generate a voltage, and then use a current source controlled by that voltage. This effectively creates a CSV-backed current source!

Here's a simulation with a working example:

Importantly, this uses the Behavioral Voltage and Current Sources support inside the simulation engine to define the current of I1 algebraically.

ACCEPTED +1 vote
by mrobbins
July 06, 2020

That's cool!

I never think about assigning a t-dependent variable by an output and then further use this variable as an t-dependent input for Current Source block.

Thx, dude.

by JamesWang
July 06, 2020

Answer by JamesWang

HI, EF82

Thx for your instruction.

Following your idea, I've made a similar example like this ( https://www.circuitlab.com/circuit/959uj4y7de5z/arbitrary-current-waveform-by-pws )

+1 vote
by JamesWang
July 05, 2020

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