Analog Filters

Course topics

  1. Introductory Course.
  2. Transfer function approximations (Butterworth, Cebîşev, Cauer, Bessel).
  3. Frequency scaling. Frequency transformation. I and II order transfer functions.
  4. The sensitivity of Electric Circuit.
  5. Passive dipole synthesis.
  6. Passive filter analysis and synthesis.
  7. Active filter synthesis. Design methods.
  8. First and second order Op-Amp-RC active filters.
  9. Design procedure for cascaded Op-Amp-RC active filters.
  10. State variable Op-Amp-RC active filters. Multiple feedback active filters.
  11. LC ladder filters with inductance simulation.
  12. Transconductance-C active filters. Transconductance-C biquads.
  13. Transconductance-C filter design.
  14. All pass filters. Delay time mitigation.

Laboratory work

  1. Transfer function approximation for given specifications.
  2. Passive filter analysis and synthesis.
  3. Sallen-Key biquad filters.
  4. Tow-Thomas biquad filters.
  5. State-variable filter design and analysis.
  6. Transconductance-C biquad filter design.
  7. Analog filter applications.

Proiect meetings

  1. Specifications. Reference overview.
  2. Computing the necessary order of the filter.
  3. Cascaded biquad analog filter design.
  4. State variable active filter design.
  5. LC ladder active filter design.
  6. Nonidealities. LTSpice simulation.
  7. Documentation. Proiect presentation.

References

  1. A. Mateescu, Semnale şi sisteme. Editura Teora, Bucureşti, 2001. UTCN Library
  2. S. Ştefănescu,Filtre, Editura tehnică, Bucureşti, 1987.
  3. M. Ţopa, V. Popescu, C. Rusu, A. Burian, Semnale, circuite şi sisteme. Îndrumător de laborator II, EdituraCasa Cărţii de Ştiinţă, Cluj-Napoca, 1997. UTCN Library
  4. A. Gogu, M. Ţopa, Semnale, circuite şi sisteme. Îndrumător de laborator III, Editura Casa Cărţii de Ştiinţă, Cluj-Napoca, 1999 UTCN Library
  5. Wai+Kai Chen (editor), The Circuits and Filters Handbook, ECRC Press, 2002.

Course description