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gladiator
Joined: 29 May 2002
Posts: 57
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 29 Jul 2004 21:37 Analog filter design using op-amp |
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| any info about gilter design using opamp
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 29 Jul 2004 23:12 Re: Analog filter design using op-amp |
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| There are many free and low cost programs for this. You can get a free program for small filters or a 20 day trial of a complex program at http://www.nuhertz.com/filter/ FilterFree is the free one.
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aslak
Joined: 04 Nov 2001
Posts: 29
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| 30 Jul 2004 18:34 Re: Analog filter design using op-amp |
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Hello,
Very simple but useful filter design software, Filterlab, available from Microchip's web page:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en010007
Rgds,
Aslak
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DoctorX
Joined: 02 Sep 2004
Posts: 73
Location: USA
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| 04 Sep 2004 0:36 Re: Analog filter design using op-amp |
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| Read the "Design of Analog Filters" by Rolf Schaumann, Mac E. van Volkenberg. Better yet, ask for the 600+ pages solution manual from Oxford Univ Publication. There are step-by-step guide to the design of analog opamp filters.
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Regnum
Joined: 17 Jun 2004
Posts: 264
Helped: 12
Location: Hurlingham
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| 04 Sep 2004 2:20 Re: Analog filter design using op-amp |
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An excellent book about active filters design:
"PRINCIPLES OF ACTIVE NETWORK SYNTHESIS AND DESIGN"
by Gobind Daryanani
Wiley
A very good filter-design software (free!):
TI FilterPro
http://www-s.ti.com/sc/techzip/slvc003.zip
Regards
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harkonnen
Joined: 14 Apr 2002
Posts: 72
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| 04 Sep 2004 8:25 Re: Analog filter design using op-amp |
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Here is a very nice online tool to design OpAmp filters:
You just use the OpAmp in a BiQuad configuration.
h**p://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/filter/filter.html
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ykishore
Joined: 02 Sep 2004
Posts: 53
Location: india
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| 04 Sep 2004 12:28 Re: Analog filter design using op-amp |
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Hay! That's very simple.
My answer will be useful to you if you want to design filters using opamps through your brain but, not using any software.
You just need to procedd like tthis:
Since the passive filters are designed using L,C,R components you need to the same even in the design of filters using opamps.
You take an opamp and add on the passive components mentioned above. Visualise the operations. That is all. But, generally C is preferred instead of L since Inductors and notas effecient as C and moreover they have in general bigger sizes which one doesn't like to have in their circuits.
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DoctorX
Joined: 02 Sep 2004
Posts: 73
Location: USA
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| 15 Sep 2004 21:45 Re: Analog filter design using op-amp |
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| I prefer to do hand (by Matlab) design. Post your detailed specifications, I may be able to post back a design example.
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wylee
Joined: 17 Feb 2004
Posts: 113
Helped: 5
Location: Malaysia
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| 16 Sep 2004 4:10 Analog filter design using op-amp |
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Does anyone has any tools/article on how to design Integrated Analog Filters in CMOS?
especially those circuit which using on-chip capacitors
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 17 Sep 2004 13:57 Re: Analog filter design using op-amp |
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| gladiator wrote: |
| any info about gilter design using opamp |
Filter design using opamp will mean you make the filter ACTIVE filter. Books are for this purpose.
Search and find any book which covers active filter design. This coverage I guess is possibly a chapter in this case.
Look for Filter handbook or book dedicated to filters which covers kinds of Active Filters a little better.
Just search here or possibly in www.
djalli.
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 17 Sep 2004 14:03 Re: Analog filter design using op-amp |
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| wylee wrote: |
Does anyone has any tools/article on how to design Integrated Analog Filters in CMOS?
especially those circuit which using on-chip capacitors |
OPAMPS are sometimes and why not in most of times CMOS technology.
So you build analog filters using CMOS technology. If you want finer filter in terms of so many things, you select better opamp (JFET ones are mines preferably) and reccomended is to tweak in different topologies of filters (Thomas1,2, SAB, Akerberg).
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DoctorX
Joined: 02 Sep 2004
Posts: 73
Location: USA
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| 18 Sep 2004 0:44 Re: Analog filter design using op-amp |
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Take a peek at this and see if it helps.
http://www.oit.pdx.edu/~haiqiao/analog%20filter%20design/index.html
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xwcwc1234
Joined: 21 Jul 2001
Posts: 313
Helped: 5
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| 28 Dec 2004 7:52 Re: Analog filter design using op-amp |
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How about to design a swited-cap filter ? Is the same as to design a active filter ?
Added after 2 minutes:
To DoctorX,
Can you upload the book "Design of Analog Filters" and the accompany solution manual here ? Thanks.
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Okkam
Joined: 08 Dec 2004
Posts: 7
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| 28 Dec 2004 12:05 Re: Analog filter design using op-amp |
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Hi
Good set of CAD-programs includind filter-design CADs from Linear Technology
http://www.linear-tech.com/company/software.jsp
Best regards.
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Learner
Joined: 01 Nov 2004
Posts: 143
Helped: 2
Location: Area 621.xxx
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| 28 Dec 2004 19:06 Re: Analog filter design using op-amp |
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| DoctorX wrote: |
| Read the "Design of Analog Filters" by Rolf Schaumann, Mac E. van Volkenberg. Better yet, ask for the 600+ pages solution manual from Oxford Univ Publication. There are step-by-step guide to the design of analog opamp filters. |
Does anyone know if this book is available for download here or some where on the net?
Thanks!
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Regnum
Joined: 17 Jun 2004
Posts: 264
Helped: 12
Location: Hurlingham
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| 06 Jan 2005 3:07 Re: Analog filter design using op-amp |
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look, someone has uploaded the book I pointed before.
(It is the best I ever read on active filters design)
"Principles of Active Network Synthesis and Design"
http://www.edaboard.com/viewtopic.php?t=98055
Regards,
Regnum
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nand_gates
Joined: 19 Jul 2004
Posts: 898
Helped: 117
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| 06 Jan 2005 5:44 Re: Analog filter design using op-amp |
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If some one here has solution manual for ...
"Design of Analog Filters" by Rolf Schaumann, Mac E. van Volkenberg.
Please upload here.....
This is the best book to start with active filter design!
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mists
Joined: 14 May 2002
Posts: 380
Helped: 33
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| 06 Jan 2005 6:44 Re: Analog filter design using op-amp |
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firstly, it is more important that someone can share the book
| nand_gates wrote: |
If some one here has solution manual for ...
"Design of Analog Filters" by Rolf Schaumann, Mac E. van Volkenberg.
Please upload here.....
This is the best book to start with active filter design! |
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chinito
Joined: 05 Jul 2004
Posts: 133
Helped: 4
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| 06 Jan 2005 18:29 Re: Analog filter design using op-amp |
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| I think one can start with matlab's filter design tool. Once you are satisfied with the specs and the transfer function you get from matlab, you can start looking into butterworth, chebyshev, eclliptical etc types of filters. That's how I would do it anyway.
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xwcwc1234
Joined: 21 Jul 2001
Posts: 313
Helped: 5
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| 07 Jan 2005 4:26 Re: Analog filter design using op-amp |
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| Study with Matlab is the second step , the first step is you should have some knowledge from book . Tool is tool , can not get any foundamental knowledge from there .
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iamchrisk
Joined: 20 Dec 2004
Posts: 7
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| 07 Jan 2005 5:28 Analog filter design using op-amp |
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hey thanks
i have tried some of the softwares which are really helpful.
but i would like to ask
"Is it possible to design a active LPF (one stage op-amp only!) with one band got -20db/dec another band got -40db/dec?
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