How to reduce second and 3'rd harmonic on low pass filter ?

Status
Not open for further replies.
J

jackie1116

Junior Member level 2
Joined
Nov 15, 2005
Messages
22
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,447
Does anyone have this experience with is .and i want to know,as below

(1) Increase orders in passive Low pass filter whether it can reduce the harmonic

(2) i use NPO cap. and hight Q inductor whether it can reduce the harmonic

(3)if i design LPF and HPF on one board,what is importance to reduce harmonic


Hope advancer can help me !

very thank a lot!
 

Re: How to reduce second and 3'rd harmonic on low pass filte

jackie1116,
The higher the order of a filter, the steeper the gain/frequency slope will be. So for a given cutoff frequency, a higher order filter will give more attenuation of harmonics. The ultimate slope of a low pass filter is 6n dB/octave or 20ndB/decade.
~
Higher Q inductors and capacitors will allow you to get closer to the ideal frequency response. Finite Q introduces additional resistive components that effect the frequency responce. The priniipal advantage of an NP0 caacitor is its small temperature coefficient of capcitance, although it does ave higher Q that other ceramic types.
Regards,
Kral
 

    J

    jackie1116

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…