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ye_zhongh
Joined: 25 Jan 2008
Posts: 19
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 02 Apr 2008 15:02 balun dc feed |
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| I know a balun is a three-port device, one unbalance input and two balance output. The two balance outputs have the same magnitude of signal with 180 degree phase difference. But I find that there exist DC feed in some balun products. I don't know what they are used for. Who can explain it to me? Thx in advance.
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fanshuo
Joined: 21 Jun 2007
Posts: 381
Helped: 5
Location: Netherlands
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02 Apr 2008 16:15 dc feed port balun |
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maybe it is a active balun
then you need power
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02 Apr 2008 16:15 Ads |
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ye_zhongh
Joined: 25 Jan 2008
Posts: 19
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03 Apr 2008 1:48 balun+dc feed |
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| you're right, It needs power. Then how does the dc feed affect the performance of the balun?
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fanshuo
Joined: 21 Jun 2007
Posts: 381
Helped: 5
Location: Netherlands
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03 Apr 2008 8:25 dc feed for rf balun |
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That depends on the design of the balun
I do not know yet
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ye_zhongh
Joined: 25 Jan 2008
Posts: 19
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03 Apr 2008 14:25 balum function |
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| I can give you the paper from the IEEE which I am puzzled about. If I post it here, it's charged and I don't know how to set it free. So maybe I can send it to you by email. OK? Mine is ye_zhongh(at)yahoo.com.
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kspalla
Joined: 19 Aug 2008
Posts: 848
Helped: 140
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22 Dec 2008 14:33 baluns with dc feed |
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I do not think active balun with out gain.
The reason could be based on the next stage level requirement.
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padpan
Joined: 02 Aug 2006
Posts: 18
Helped: 3
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21 Apr 2009 12:56 balun dc feed 차이 |
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The DC feed is basically used to feed with DC the balanced inputs (or outputs) and should have minimal effect on the balun performance. Of course, those feeds/teeminals can play a vital role if they are used in the impedance transformation, but 50:50 Ohm conversion will actually require AC gnd for those nodes...
--padpan
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