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Low pass filter circuit questions

  • Engineering
  • Thread starter thenerveman
  • Start date
  • #1

Homework Statement



Why does a low pass active filter give a constant gain and no filtering when the capacitor is removed? What type of circuit does this become? Support your answer with equations.

also

Does the amplitude eventually roll off as the frequency was increased toward to a very large value? how would you determine this value? Why does this occur?

Homework Equations



not sure


The Attempt at a Solution



i dont know where to start really. Our professor is a week behind in his lectures and he assigned this.. I am stuck on these two questoins.
 

Answers and Replies

  • #2
NascentOxygen
Staff Emeritus
Science Advisor
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1,068
Search for a low pass filter constructed around an OP-AMP.
 
  • #3
1,506
17
The capacitor is the frequency dependent component and, as nascent oxygen has indicated, an op amp has some frequency dependency
 

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