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easygoing
Joined: 24 Jul 2003
Posts: 23
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 02 Sep 2003 8:35 About LTCC |
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Can anyone discuss LTCC used in RF front end?Maybe I could do it in coming future.
From some webs, I find that it is mainly used in passive elements,especially filters and vco...
Anyone advices?
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godz
Joined: 22 Sep 2003
Posts: 34
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| 28 Sep 2003 14:28 Re: About LTCC |
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Hi,
LTCC is one of the low cost MCM technologies, you can find good info about this in the following website www.valtronic.com.
regards,
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VSWR
Joined: 07 Feb 2002
Posts: 639
Helped: 53
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| 28 Sep 2003 23:16 Re: About LTCC |
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- long delivery time
- not for high power design (bad heat conducting)
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 28 Sep 2003 23:19 good use |
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| They are very good for making modules that use transmission lines like filters and couplers. I saw one that was multilayered and had about six filters in a square cm or two.
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JoeSchmo
Joined: 09 May 2002
Posts: 18
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| 06 Oct 2003 3:49 Re: About LTCC |
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LTCC is a good approach for a front end when cost and/or complexity are driving the design. It has decent thermal charateristics, although electrically, due to the roughness of the metalization, the losses can be a little higher than soft substrate.
Reasons to use LTCC:
- Extremely complex multilayer circuits (30+ Layers) including over 80,000 vias (blind, if necessary) per layer
- Touch labor is low compared to similar circuits in other substrates
- Very good precision
Reasons not to use LTCC:
- Vendor stability. The vendor's firing profiles vary to the point that you design to their process
- Shrinkage. While in local precision is excellent, a large scale shrinkage is rather unpredictable. Flatness is also an issue
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