Technical skill tree
Competence should be visible, specific and evidenced.
AoN does not reduce an engineer to one global level. Each branch progresses independently, and higher levels require stronger technical evidence.
Global level semantics
L0 → L5 means the same thing everywhere.
Fundamentals
Can explain the core idea and solve a constrained foundational problem.Guided application
Can apply the skill in a structured lab or simulation and interpret the result.Independent engineering
Can independently design, analyse or debug a non-trivial case under stated constraints.Experimental / reproducible mastery
Can connect theory to reproducible experimental or independently reproduced evidence and defend discrepancies.Synthesis and contribution
Can synthesize the skill across contexts, review advanced work and create technically reliable contributions for others.Ontology v0.1
36 initial skills across 6 branches.
Display names may evolve, but machine IDs remain stable so old exercises, portfolios, MAJAL submissions and reviews do not break when the taxonomy grows.
Electronics
DC/AC circuits, passive networks and circuit reasoning.
electronics.dcDC circuit reasoning
Ohm's law, KCL/KVL, power and loaded networks.
electronics.theveninThévenin and Norton equivalents
Equivalent-source reasoning, input/output resistance and loading.
electronics.acAC and complex impedance
Phasors, impedance, admittance and sinusoidal steady state.
electronics.rlcRC/RL/RLC networks
Frequency response, resonance, damping and first/second-order networks.
Analog Electronics
Biasing, small-signal models, feedback, oscillators and noise.
analog.bjtBJT fundamentals
Operating regions, biasing and transistor circuit intuition.
analog.small-signalSmall-signal analysis
Linearisation, gm, rπ and incremental circuit models.
analog.feedbackFeedback
Loop gain, closed-loop behaviour, bandwidth and stability intuition.
analog.millerMiller effect
Equivalent input/output capacitance and bandwidth consequences.
analog.cascodeCascode architectures
Gain, isolation and Miller-effect suppression in cascoded stages.
analog.noiseAnalog noise
Thermal, shot and device noise; input-referred noise and noise budgets.
RF & Microwave
Transmission lines, Smith chart, S-parameters, matching and filters.
rf.transmission-linesTransmission lines
Distributed circuits, characteristic impedance, propagation and standing waves.
rf.reflectionReflections and matching fundamentals
Reflection coefficient, return loss, VSWR and power transfer.
rf.smithSmith chart
Impedance/admittance mapping and graphical matching reasoning.
rf.two-portTwo-port networks
Z, Y, ABCD/T representations, conversion and cascade reasoning.
rf.sparametersS-parameters
Travelling-wave description of N-port networks and physical interpretation.
rf.touchstoneTouchstone data
Read, validate and interpret measured/simulated S-parameter files.
rf.matchingRF impedance matching
Design and evaluate lumped/distributed matching networks under constraints.
rf.filtersRF filter design
Specification-driven filter synthesis, simulation and measurement.
Measurement & Instrumentation
Oscilloscope, VNA, calibration, uncertainty and reproducibility.
measurement.interpretationMeasurement interpretation
Distinguish measured quantity, model prediction, uncertainty and artefact.
measurement.oscilloscopeOscilloscope measurement
Probing, bandwidth, loading, triggering and quantitative waveform measurement.
measurement.vnaVector network analyser
Configure a VNA, understand reference planes and acquire S-parameters.
measurement.vna.soltSOLT calibration
Perform and reason about SOLT calibration and the calibrated reference plane.
measurement.uncertaintyMeasurement uncertainty
Identify uncertainty sources, repeatability limits and defensible reporting.
measurement.reproducibilityExperimental reproducibility
Provide enough raw data, conditions and method detail for independent reproduction.
Nanoelectronics
Semiconductor physics, transport, Hall/TLM, 2DEG, quantum wells and graphene.
nano.semiconductor-physicsSemiconductor physics
Bands, carriers, statistics and semiconductor device foundations.
nano.transportElectronic transport
Conductivity, mobility, scattering and transport regimes.
nano.hallHall characterisation
Extract carrier sign, density, mobility and sheet resistance from Hall measurements.
nano.tlmTLM contact characterisation
Extract sheet resistance, contact resistance and transfer length from TLM structures.
nano.2deg2D electron gases
Population, confinement, transport and electrostatics of semiconductor 2DEGs.
nano.quantum-wellsQuantum wells
Confinement, subbands and coupled electrostatic/quantum reasoning.
nano.grapheneGraphene electronics
Band structure, carrier transport, gating and graphene device characterisation.
nano.plasmonics2D plasmonics
Collective carrier oscillations, dispersion, damping and coupling structures.
Research
Paper reproduction, numerical models, model validity and open problems.
research.model-validityModel validity
State assumptions, domains of validity and failure modes of analytical/numerical models.
research.numerical-methodsScientific numerical methods
Implement, verify and test numerical calculations against limiting cases.
research.reproductionPaper/result reproduction
Reproduce a published result with traceable assumptions, parameters and code/data.
research.peer-reviewTechnical peer review
Review technical work for correctness, assumptions, reproducibility and clarity.