Schematic editor
Schematic editor
Draw analog and RF circuits with ports, components, net labels, and touch-friendly editing.
Tersa EDARF / analog
Electronic design, wherever you work.
Design, simulate, measure, and optimize electronic circuits across desktop, tablet, and mobile.
SchematicsAC / transientS-parametersSmith chartComponent tuner
Run / Live
Product proof
Designed for real circuit work.
Build a schematic, choose an analysis, add measurements, and tune values without leaving your device.
Measurements
Measurements and plots
Inspect traces, markers, frequency response, and derived measurements.
RF
RF and Smith chart
Analyze S-parameters, return loss, insertion loss, impedance, and Smith chart trajectories.
Updated July 27, 2026
Tersa EDA answers
What is Tersa EDA?
Tersa EDA is an RF and analog circuit simulation workspace for engineers, students, and hardware teams who need a focused schematic-to-measurement flow. It combines schematic capture, SPICE-compatible analysis setup, plots, RF measurements, Smith chart inspection, and component tuning in one product surface. The goal is not to replace large desktop EDA suites. The product is designed for quick experiments, tablet review, mobile debugging, and focused circuit tuning when the important question is how the response changes after a component value, port, or measurement is adjusted.
What RF measurements does it support?
Tersa EDA presents RF results around practical measurements: S11, S21, S12, S22, return loss, insertion loss, gain, stability-oriented traces, frequency markers, and Smith chart trajectories. The workflow starts from the schematic, adds ports and analysis settings, then keeps the plot and tuner connected to the circuit. This makes it useful for filters, matching networks, resonators, small-signal experiments, and quick RF review where the designer needs to compare traces instead of exporting data between separate tools.
What does the 500 MHz LPF example show?
The 500 MHz low-pass filter example demonstrates a complete RF workflow on iPad. It shows a 50 ohm ladder filter with series inductors, shunt capacitors, input and output ports, S-parameter simulation to 1 GHz, insertion loss, return loss, and component tuning. The blue S21 trace shows passband behavior and roll-off, while the green S11 and S22 traces help inspect matching. The tuning sweep makes cutoff movement visible as capacitor and inductor values change around the target frequency.
Features
From schematic to measurement.
Touch-friendly schematic editor
Create circuits with components, ports, labels, and reusable sheets on mobile, tablet, or desktop.
Simulation results
Run AC, transient, and RF analyses with clean plots, markers, and trace controls.
RF tools
Inspect S-parameters, return loss, insertion loss, Smith charts, gain, and stability metrics.
Component tuner
Tune component values and immediately see how the circuit response changes.
Workflow
From schematic to insight.
Build a schematic, choose an analysis, add measurements, and tune values without leaving your device.
01
Draw the circuit
Place components, connect nets, and define ports.
02
Choose analysis
Run AC, transient, or RF simulations.
03
Add measurements
Plot voltages, S-parameters, losses, and markers.
04
Tune values
Adjust components and compare the response.
Product demos
Watch real RLC workflows on iPhone and iPad.
Short product videos show schematic creation, simulation, measurement, and live component tuning in Tersa EDA.
iPhone shorts
Real-Time RLC Circuit Tuning on iPhone
Tune an RLC circuit directly on iPhone and watch the response update while component values change.
Open on YouTubeiPhone shorts
Building and Simulating an RLC Circuit on iPhone
Create an RLC schematic on iPhone, run simulation, and inspect the first measurement workflow.
Open on YouTubeiPad walkthroughs
Tuning RLC Resonance in Real Time on iPad
Use the iPad workspace to tune resonance and compare circuit response changes on a larger engineering canvas.
Open on YouTubeiPad walkthroughs
Building an RLC Resonator on iPad | Tersa EDA
Build an RLC resonator from scratch on iPad and move from schematic capture into analysis setup.
Open on YouTubeRF example
500 MHz low-pass filter example on iPad.
A concrete LPF case study built in Tersa EDA: schematic capture, 50 ohm ports, S-parameter simulation, insertion loss, return loss, and component tuning around a 500 MHz target.
Target
500 MHz LPF
Ports
50 ohm IN / OUT
Analysis
S-parameters to 1 GHz
Workflow
Schematic, plot, tuner
This example shows a lumped 500 MHz low-pass filter workflow, not a generic screenshot gallery. The circuit uses a ladder topology with 50 ohm input and output ports, series inductors, shunt capacitors, and RF measurements plotted from DC to 1 GHz.
The blue S21 trace shows the passband and roll-off, while the green S11/S22 traces help inspect matching and return loss. Tuning sweeps make cutoff movement visible as component values change.
500 MHz LPF S-parameter response
S-parameter response with S21 staying flat through the passband before the transition region toward 1 GHz.
500 MHz LPF tunable component parameters
Tuning ranges expose capacitor and inductor values so the cutoff behavior can be optimized directly from the schematic.
500 MHz LPF tuning sweep
A tuning sweep compares multiple S-parameter traces around the cutoff and stopband regions.
500 MHz LPF project workspace
The project workspace keeps the LPF schematic, simulation plot, variables, and tunable parameters in one engineering flow.
500 MHz LPF return loss and insertion loss
Return loss and insertion loss traces make it possible to inspect passband fit and out-of-band rejection.
RF Tools
Built for RF experiments.
Tersa EDA includes RF-focused measurements alongside everyday analog simulation: S-parameters, return loss, insertion loss, Smith chart trajectories, gain metrics, stability factors, and target-frequency markers.
S11 / S21 / S12 / S22
Return loss and insertion loss
Smith chart markers
Gain and stability metrics
Matching and tuning workflow
Analog
Useful for everyday analog circuits.
Use Tersa EDA for filters, dividers, amplifiers, diode circuits, RC transients, frequency response checks, and quick what-if experiments.
AC frequency responseTransient waveformsVoltage measurementsComponent tuningExample circuits
Screenshots
A workspace that follows the circuit.
Real app screens from projects, schematic editing, RF plots, Smith chart inspection, and tuning.
Projects
Schematics list
Schematic editor
Rectangular plot
Smith chart
Component tuner
Beta testing
Tersa EDA is now in beta testing.
We are inviting engineers, students, and RF/analog teams to try early builds and tell us what should be sharpened first.
Target beta release: around August 5, 2026.
Email us directly: hello@tersaeda.comFAQ
Is Tersa EDA a PCB design tool?
Not yet. Tersa EDA focuses on schematic capture, circuit simulation, measurements, plots, and analog/RF tuning.
Is it a replacement for ADS, AWR, or LTspice?
No. It is a lightweight workspace for quick circuit experiments, mobile review, and RF/analog tuning. It is designed to complement desktop engineering tools.
What can I simulate?
The first versions focus on analog circuits, AC and transient analysis, S-parameters, Smith charts, and component tuning.
Is it mobile only?
No. The interface is designed for mobile, tablet, and desktop screens.
What simulator workflow does it use?
Tersa EDA uses a SPICE-compatible simulation workflow for circuit analysis.