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Single ended to differntial LPF - RF Cafe Forums
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ljoseph
Post subject: Single ended to differntial LPF Posted: Wed
Aug 19, 2009 3:02 pm
Captain
Joined: Tue Sep 04,
2007 7:54 am
Posts: 13
Location: Dallas
Hi,
I have calculated
the values for a 230 Mhz LPF for single ended configuration with source
and load impedance of 100 ohms. I want o convert this filter to differential.
How to convert the L and C values from single ended to differential?
Single ended filter values (5 pole butterworth)
L1=30nH
L2=16nH
C1=29pF
C2=27pF
C3=6pF
Top
Paul Chriss
Post subject: Re: Single ended to differntial LPFPosted: Mon Sep
21, 2009 10:41 pm
Captain
Joined: Sat Mar 04, 2006 10:12
am
Posts: 8
I swear I don't work for them, but I just did a Google
Search and found this program that does the job.
http://www.appliedmicrowave.com/Filter1B.htm
Maybe you can downlaod a trial version?
Top
Alberto
Post subject: Re: Single ended to differntial LPFPosted:
Wed Oct 07, 2009 6:05 pm
Captain
Joined: Sun Oct 04,
2009 5:17 pm
Posts: 6
The 4 series inductors (2 for each branch
of the differential filter) value will be equal to the single ended
value divided by 2. In your case
L1a = 15 nH
L1b = 15 nH
L2a
= 8 nH
L2b = 8 nH
Capacitors, instead, will keep their original
value:
C1 = 29 pF
C2 = 27 pF
C3 = 6 pF
Best regards,
Alberto
Posted 11/12/2012
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