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memarian
Joined: 11 Aug 2004
Posts: 175
Helped: 22
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 01 Oct 2007 12:55 Ultra Wideband Bias-TEE Equivalent circuit |
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Dear,
I want to use a wide band ~1W MMIC Amplifier,that i must using it's output RF power pin
for DC Supply. Usually i use a Bias-TEE for this purpose but a Wide band Bias-Tee
has about 1~1.5dB insertion Loss.I need to find another solution to avoid that Loss.
(Maximum 0.5dB Loss is acceptable).
My FREQ. Range is 6~14 GHz(this MMIC is usable up to 20GHz @ 27dBm).
Does anyone have any solution?
this MMIC have a Output Return Loss < -10dB (VSWR~2) in it's bandwidth.
Thanks.
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fwbsys
Joined: 19 Apr 2007
Posts: 3
Helped: 1
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| 02 Oct 2007 16:14 Re: Ultra Wideband Bias-TEE Equivalent circuit |
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Hi,
as i designed a circuit with an era amplifier i've used a capacitor and inductor in the dc supply path to surpress the the HF-parts ... the loss was between 0,5 and 1dB if i remeber right ... i used a 500µm rogers substrate with 1200µm hf-coplanar lines an a 200µm dc-supply line 800MHz - 5GHz
mayba you can try to vary the dimensions of your dc-supply or hf line?
cu
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biff44
Joined: 24 Dec 2004
Posts: 1175
Helped: 149
Location: New England, USA
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| 04 Oct 2007 16:39 Ultra Wideband Bias-TEE Equivalent circuit |
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I would use one of these broadband conical inductors from Piconics.
http://piconics.com/
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Abhishekabs
Joined: 12 Jan 2007
Posts: 342
Helped: 30
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| 11 Dec 2007 7:38 Ultra Wideband Bias-TEE Equivalent circuit |
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I want to design a bias tee for measurement of S parameters using test fixture.
How should I design broad band bias tee?
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wjnbry
Joined: 09 Sep 2003
Posts: 57
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| 06 Jan 2008 10:43 Re: Ultra Wideband Bias-TEE Equivalent circuit |
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| Abhishekabs wrote: |
I want to design a bias tee for measurement of S parameters using test fixture.
How should I design broad band bias tee? |
i've the same idea.give me some information if you get it.
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shogun
Joined: 05 Feb 2003
Posts: 27
Location: Forests of Japan
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| 24 Jan 2008 2:46 Re: Ultra Wideband Bias-TEE Equivalent circuit |
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If the circuit if operating above 1Ghz and you have the board space you will need to use a radial stub. It will act like an open circuit at your frequency of interest.
Shogun
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laipi
Joined: 27 May 2004
Posts: 3
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| 09 Apr 2008 8:54 Re: Ultra Wideband Bias-TEE Equivalent circuit |
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Without detail information your frequency area, it is hard to give any design tip.
As you having said, you are going to use it to measure S-parameter, so it is small RF signal you are dealing with, then how much of the biaing current through the biasingh path? THis will determine your choice for the RFC.
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james cook
Joined: 04 Sep 2005
Posts: 89
Helped: 5
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| 11 Apr 2008 12:39 Re: Ultra Wideband Bias-TEE Equivalent circuit |
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hope following pappers help
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mirabella2
Joined: 22 Jul 2007
Posts: 17
Location: Solar system, Saturn
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| 17 Apr 2008 9:16 Re: Ultra Wideband Bias-TEE Equivalent circuit |
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| memarian wrote: |
Dear,
I want to use a wide band ~1W MMIC Amplifier,that i must using it's output RF power pin
for DC Supply. Usually i use a Bias-TEE for this purpose but a Wide band Bias-Tee
has about 1~1.5dB insertion Loss.I need to find another solution to avoid that Loss.
(Maximum 0.5dB Loss is acceptable).
My FREQ. Range is 6~14 GHz(this MMIC is usable up to 20GHz @ 27dBm).
Does anyone have any solution?
this MMIC have a Output Return Loss < -10dB (VSWR~2) in it's bandwidth.
Thanks. |
ADCH-80 or ADCH-81 to 10Ghz:D
http://www.minicircuits.com/pages/s-params/ADCH-80_VIEW.pdf
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masud_809
Joined: 27 Sep 2006
Posts: 104
Helped: 11
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| 27 Apr 2008 16:50 Ultra Wideband Bias-TEE Equivalent circuit |
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| You mean for designing broad band dc-bias network, at high frequencies, there's no need to design radial stubs?!! and we can use only a capacitor and inductor to isolate the RF signals?
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