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Tel: (541) 745-3935
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Corvallis, OR 97330

SEMINAR6
HIGH PERFORMANCE FILTERING

(Half Day)

The ripple attenuation of single stage filters is limited by the size of the "L" and "C" at low frequencies, and by the parasitics of the filter components at high frequencies. Classical multi-stage filters (with equal L-C sections) can increase ripple attenuation for a given total filter inductance and capacitance, but closing a feedback loop around these filter is next to impossible due to excessive phase shift and/or resonant peaking. However, various filter circuits and design techniques can be used to improve filter attenuation while minimizing the L and C required, and still allow closure of a stable, high bandwidth feedback loop.

Topics discussed in this seminar include:

PASSIVE FILTERING METHODS

  • Classical multi-stage filters
  • "Dominant L" multi-stage filters
  • "Wave traps" for high attenuation at selected frequencies
  • Broadband ripple rejection techniques
  • Ripple steering in coupled inductors
  • Resonance damping of multi-stage filters
  • Feedback around multi-stage filters
    • Using LF and HF feedback paths
    • Using the Nichols chart

"ACTIVE" or ELECTRONIC FILTERING METHODS

  • Poly-phase power conversion
  • "1-D" ripple cancellation
  • Active filtering using feedback
  • Active filtering using feedforward
  • Switchmode/linear hybrids

This seminar is often combined with the related half day "SMPS Feedback and Control" seminar for a one-day seminar.

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