Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

improving the group delay of my filter - help please

Status
Not open for further replies.

m229

Member level 2
Joined
Jul 22, 2001
Messages
53
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,286
Location
Iran
Activity points
415
design microwave filter

hi all;
i want to improve the group delay of my filter; what can i do? can anyone help me?

m229
 

toonafishy

Full Member level 6
Joined
Jun 18, 2002
Messages
369
Helped
38
Reputation
76
Reaction score
12
Trophy points
1,298
Location
Earth
Activity points
3,187
Sharp cutoff filters usually have poorer group delay. How sharp is your filter?
 

filterman

Member level 2
Joined
Jan 18, 2002
Messages
52
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
512
Re: design microwave filter

1. As another electroda member wrote you use linear filter , that will give you about 90% of bandwidth with equal delay. But those filters are quite complex.
2. Add delay equalizer-sfilsyn, filpro, eagleware, pcfilt can do it for you.
3. Another common method if possible , design a much wider filter that still meets your rejection. Thus you can use the center of the bandwidth which will have flat delay. If fizable this last approach is easy to realize.
 

m229

Member level 2
Joined
Jul 22, 2001
Messages
53
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,286
Location
Iran
Activity points
415
an explaination

Dear
suppose i have a bessel filter that is a maximally flat filter and have a flat group delay and have a bad magnitude response (relative to butterworth filter) and i want to improve the magnitude response and have that flat groupdelay.
or suppose i have a butterworth filter that have a good magnitude response but a bad groupdelay response (relative to flat groupdelay), so, iwant to improve the GD.
consequently, i want a filter with a "GD response similar to bessel and magnitude response similar to butterworth".
best regards,
m229
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top