Calculate an R/I DC operating point

Calculate node voltages and branch currents for a saved resistor and DC current-source circuit in Altifigence Cloud.

Use these steps in Altifigence Cloud 2.1.2.10. Sign in, select an organization with an active paid plan eligible for SPICE DC analysis, and open a Cloud project. The calculation runs locally in your browser.

Prepare the circuit

Create or open a .cir file in your workspace. Use a title on the first line, resistor and independent DC current-source statements, one .op, and a final .end. Node 0 is ground. Give each node a resistor path to ground.

Keep the saved input within 64 KiB, 4,096 lines, 256 nodes including ground, and 1,024 elements.

DC current-source example
R1 n 0 10
I1 0 n DC 2m
.op
.end

Run the operating point

  1. Save the .cir file.

  2. In Flow Navigator, open Simulation → SPICE DC operating point.

  3. Under Saved workspace .cir file, select or enter the saved file's workspace path.

  4. Select Run DC operating point.

Read and save the results

Read Node voltages in volts and Branch currents in amperes. The result also shows the saved input path, SHA-256, and KCL residual with its accepted limit. Positive branch current follows the first terminal to the second terminal written in each statement.

Select Download result JSON to save the result, or Download table CSV to save the tables. To view a saved JSON result later, select Open saved result JSON.

Correct a circuit diagnostic

If the panel shows a diagnostic with a source line, use its Open … at line …, column … link to open that statement. Correct the circuit, save it, and select Run DC operating point again.

See Digital Design Studio for the project workspace.