- Suppressing/amplifying specific frequencies
→ Tuned LC circuit match inductive and capacitive elements for a given frequency range - Resonant tank impedance response filter types
→ LC in series with load → band-pass
→ LC in parallel with load → band-stop (“notch”)
→ L in series, C in parallel with load → Second-order low-pass
→ C in series, L in parallel with load → Second-order high-pass - Filter roll-off/steepness determined by order
→ higher-order filter rolls off faster and is steeper
+ Can be used to manipulate current and voltage waveform timing
→ Soft switching: ZVS/ZCS
→ Pulse Frequency Modulation can be used to control output voltage