From a touch-edited schematic to a measured response
Tersa is a compact workspace for learning, checking and tuning small analog and RF circuits. Create a schematic, configure an analysis and inspect the result without leaving the project. Simulation runs locally on your device.
- —DC operating point and DC sweep for bias and static response
- —AC analysis for small-signal frequency response
- —Transient analysis for time-domain waveforms
- —Linear two-port S11, S12, S21 and S22, return and insertion loss, and Smith charts
Try a 1.59 kHz RC low-pass filter
Build a first-order low-pass with R1 = 1 kΩ in series and C1 = 100 nF from the output to ground. With an ideal voltage source and no output load, the expected cutoff is fc = 1/(2πRC) ≈ 1.59 kHz.
- —Set the AC source amplitude to 1 V and sweep from 10 Hz to 100 kHz.
- —Plot the output voltage. A marker near 1.59 kHz should show about −3 dB relative to the low-frequency level.
- —For a separate transient check, apply a 0-to-1 V step. The output should reach about 63% after RC = 100 µs.
- —Use the tuner to change R1 to 2 kΩ, rerun and compare: the ideal cutoff falls to about 796 Hz.
Start small, then check your models
Explore the included RC and LC sample projects or draw your own circuit. Import supported SPICE model cards and subcircuits when needed; support for one model does not imply support for every simulator dialect.
- —Check model syntax, pins and parameters before relying on an imported part.
- —Full compatibility with LTspice models, directives or project files is not promised.
- —Check numerical settings and verify results independently before fabrication or safety-related use.
