A study on EMI noise source modeling with current source for power conversion circuit

Dedicated computational models for the electromagnetic emissions of integrated circuits

“…The LECCS model is defined in the frequency domain and consists of an equivalent internal impedance of the IC and an equivalent internal current source that expresses the internal noise source caused by the switching operations of transistors [11]. It is able to predict the conducted emissions and analyze the immunity up to 1 GHz [2].…”

“…with Z i the synthesized circuit impedance of the equivalent circuit, Z s the measured or simulated internal impedance of the power supply and I v the measured power current [11].…”

“…The values R and C are, respectively, the on-resistance and the capacitance between drain and source [11]. And since the functional blocks of ICs consist of CMOS transistors, the approximated equivalent circuit model of an IC can be described by an RLC-series circuit in parallel with an equivalent internal current source.…”

N-Conductor Passive Circuit Modeling for Power Converter Current Prediction and EMI Aspect

“…Many measurement possibilities can be imagined, such as: open circuit (if possible), loaded, open circuit when shorting (if possible) or loading other ports, etc. Some, examples for output impedance extraction can be found in [20]- [24]. However, in some cases, depending on the converter output impedance, the filter impedance and the considered frequency range, the output impedance matrix can be neglected.…”