Ask Experts » Education » Exam Questions »

Comparision of Active Filter and Passive filters

Date: 31 Jan 2011   Group: Education    Category: Exam Questions    Posted By: [Anonymous]   

What is Difference between Active Filter and Passive filters?

Find Answers

Author: MITHILESH DHUPIA    31 Jan 2011      Member Level: Silver     Points : 1    Voting Score: -1

passive filters are the combination of those components which do not require any external power supply such as resistors inductor and capacitors,on contrary active filters are the combination of active and passive elements like transistor
Author: zafar    31 Jan 2011      Member Level: Gold     Points : 7  (Rs 7)    Voting Score: 0


Active Filter :
Active Filter

  • These Make use of the active device and resistor and capacitor. No inductor is used.
  • As no inductor is used, circuit becomes compact and less in weight even at low frequencies.
  • It require dual power supply.
  • Input impedance is high.
  • As the output impedance is low, it can drive the low impedance load.
  • Load is isolated from the frequency determine network. So variation in load does not affect the characteristic of the filter.
  • It is possible to increase the gain.
  • Parameters like gain, pass band, cut off frequency can be adjusted.
  • High frequency response is limited by gain band width product and slew rate.
  • Variation in power supply voltage affects the output voltage.
  • Feedback through common supply rail may cause oscillations.

    Passive Filter :
    Active Filter

  • These make use of the passive components like inductor, capacitor, resistor etc.
  • Circuit becomes bulky and costly especially for low frequency because size of the inductor increases at lower frequency.
  • It does not need power supply.
  • Input impedance is less which loads the source.
  • Output impedance is more so it can not drive the low impedance load.
  • Load is not isolated from the frequency determining network so variation in load may affects the characteristic of filter.
  • It is not possible to increase the gain.
  • It is not possible to adjust the parameters.
  • No restriction at high frequency.
  • No power supply is used. So output us not affected.
  • No such problem arises.

    With best regards,

  • Answers      

    Post answer or solution to "Comparision of Active Filter and Passive filters"

    You can earn revenue online from Google AdSense and our revenue sharing programs by post valid, self written answers for the problem Comparision of Active Filter and Passive filters

    You must Sign In to post a response.

    Next Question: Write down the drawbacks of classical free electron theory?
    Previous Question: I am a class 12 ISC board science stream student and i am a bit confused about my career
    Return to Question Index
    Ask Question to Expert
    Category: Exam Questions

    Related Questions
    Popular Tags   What are tags ?   Search Tags  

    Awards & Gifts
    Active Members
    TodayLast 7 Daysmore...

    ISC Technologies, Kochi - India. Copyright © All Rights Reserved.