Engineering Board Exam Reviewer · Passive Filters · medium
For the RC low-pass filter shown (R=6.8 k , C=22 nF), by how many degrees does the output voltage lag the input voltage at 3.19 kHz?
- 71.6°
- 18.4°
- 45°
- 90°
Answer
A. 71.6°
Solution
fc=1/2π RC=1.06 kHz. = -1!≤ft(f/fc )= -1!≤ft( 3.19 kHz1.06 kHz )=71.6° (lagging).
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