Write and run a complete JoSIM circuit netlist

Before starting

Use the intended licensed JoSIM®-Pro installation and a new writable working folder. Check its CLI version. This example was exercised on the recorded Windows 2.9 review CLI; final-package and other-platform checks remain open.

Save the circuit below as UTF-8 plain text named rc_basic.cir. Confirm the actual extension rather than a hidden .txt suffix. Node 0 is the reference; IN and OUT are node names. The initial * line is a comment.

Create the complete circuit

.PARAM DRIVE=1m supplies the PWL source amplitude: 1 mV here. R1 is 50 ohms and C1 is 0.2 pF, so the RC time constant is 10 ps. The source rises from 0 to 1 mV between 10 and 20 ps and then stays constant.

The R and C lines provide the electrical network, .OPTION selects VOLTAGE/BDF for this example, .TRAN requests a 0.5 ps integration step to 100 ps, and .PRINT requests two voltages and the R1 current. .END terminates the deck.

A Josephson circuit additionally needs the appropriate B instance and matching model card/library. Use the model guide for its parameters and scaling; this linear RC example does not establish junction physics.

* RC response: 50 ohm, 0.2 pF, 10 ps time constant
.PARAM DRIVE=1m
V1 IN 0 PWL(0 0 10p 0 20p DRIVE 100p DRIVE)
R1 IN OUT 50
C1 OUT 0 0.2p
.OPTION ANALYSIS=VOLTAGE INTEGRATION=BDF
.TRAN 0.5p 100p
.PRINT V(IN) V(OUT) I(R1)
.END

Run and inspect the saved deck

1. Run the command below from the working folder. If the executable is not on PATH, use its actual installed path as described in the CLI guide.
2. Read the first diagnostic and job status. Confirm rc_basic.csv is newly created, then inspect its headers and time span.
3. Keep seconds, volts and amperes attached to the exported columns. Check the response before introducing additional devices or models.

josim-pro-cli -o rc_basic.csv rc_basic.cir

Recognise success

The checked file has time, V(IN), V(OUT) and I(R1) columns, 201 finite samples and a 0–100 ps span. The output charges toward 1 mV after the input ramp; the reference at 50 ps is approximately 0.96853 mV.

For an independent check, let A=1e-3 V, T=10e-12 s and tau=50*0.2e-12 s. During the ramp, with u=t-10e-12, Vout=(A/T)*(u-tau*(1-exp(-u/tau))). After 20 ps, Vout=A*(1-(tau/T)*(1-exp(-T/tau))*exp(-(t-20e-12)/tau)). Before the ramp Vout=0.

The checked 0.5 ps run stayed within 0.5% of the 1 mV drive when compared with that ideal reference. The refinement guide makes the time-step effect explicit; this local criterion does not establish a production model tolerance.

If parsing or simulation fails

Use the exact diagnostic to check the saved filename, statement spelling, node connections, required model/library and complete .TRAN/.PRINT/.END lines. The analysis uses the saved file, not unsaved editor text.

Write output to a separate path and use a new result name after a failed attempt. For missing dependencies follow the include-recovery guide; for a matrix/topology diagnostic reduce to a complete small circuit before tuning the solver.