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First Order Filter Circuit

First Order Filter Circuit. Section 14.1-14.3. First Order Filter Design. LPF: RL HPF: RL LPF: RC HPF:RC. Filter Circuits. Low Pass Filter. High Pass Filter. Intuition. RL Low-Pass Filter. RL Circuit @ 100 Hz. RL Circuit @ 1000 Hz. RL Circuit @ 10,000 Hz. Summary. Rule of Thumb (1).

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First Order Filter Circuit

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  1. First Order Filter Circuit Section 14.1-14.3

  2. First Order Filter Design • LPF: RL • HPF: RL • LPF: RC • HPF:RC

  3. Filter Circuits Low Pass Filter High Pass Filter

  4. Intuition

  5. RL Low-Pass Filter

  6. RL Circuit @ 100 Hz

  7. RL Circuit @ 1000 Hz

  8. RL Circuit @ 10,000 Hz

  9. Summary

  10. Rule of Thumb (1) • Phase • The phase change starts one decade before the cut-off frequency • At the cut-off frequency, the phase change is 45 degrees. • At one decade after the cut-off frequency, the phase change is 90 degrees. • The phase change is complete one decade after the cut-off frequency.

  11. Rule of Thumb (2) • Magnitude • The magnitude change starts at the cut-off frequency. • The magnitude response is 0 dB at cut-off frequency. • 20 dB per decade after the cut-off frequency.

  12. RL High Pass Filter

  13. RL Circuit @ 1000 Hz

  14. RL Circuit @ 1000 Hz

  15. RL Circuit @ 10,000 Hz

  16. Frequency: 1 KHz Low pass RL Filter Vout lags Vin High pass RL Filter Vout leads Vin

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