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First Order Filter Circuit Section 14.1-14.3. First Order Filter Design LPF: RL HPF: RL LPF: RC HPF:RC.

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Presentation on theme: "First Order Filter Circuit Section 14.1-14.3. First Order Filter Design LPF: RL HPF: RL LPF: RC HPF:RC."— Presentation transcript:

1 First Order Filter Circuit Section

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

3 Filter Circuits High Pass Filter Low Pass Filter

4 Intuition

5 RL Low-Pass Filter

6 RL 100 Hz

7 RL 1000 Hz

8 RL 10,000 Hz

9 Summary Freq (Hz)Vout,mag/Vin,magPhase (deg) Approx imate (Phase) /2=0.9945, (0dB) /2=0.7295, ( dB) , /2=0.1345, (-17.4 dB)

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 1000 Hz

14

15 RL 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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