Author Topic: Built in resistors in PCB  (Read 926 times)

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Offline daqqTopic starter

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Built in resistors in PCB
« on: July 31, 2019, 09:50:49 am »
This is pretty awesome:

https://www.pcbcic.com/wp-content/uploads/2017/10/5-Ohmega_Design_Version_18_1.pdf

Basically resistive material is built into the conductive layers (even internal) of a PCB and the technology seems pretty precise, enabling stuff like termination/pullup resistors on the inner layers between the balls of a fine pitch BGA.
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The following users thanked this post: Brutte, ogden

Offline Brutte

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Re: Built in resistors in PCB
« Reply #1 on: July 31, 2019, 11:44:30 am »
Carbon ink comes to mind, although carbon ink can be only applied to surface and vias (no internal layers afaik).

I am not sure how to integrate that in a toolchain (managing libraries, testing, DRC, etc). For termination of GHz signals under FPGA it might have its place but in mainstream electronics the access to this kind of service seems quite limited. For analog applications and 3% tolerance - niche market.

I am waiting for a built-in transistor  :popcorn:

 

Offline soldar

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Re: Built in resistors in PCB
« Reply #2 on: July 31, 2019, 03:26:02 pm »
I can see in the future PCBs where the tracks are really printed and the ICs are embedded inside the PCB, not on the surface.

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Offline daqqTopic starter

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Re: Built in resistors in PCB
« Reply #3 on: July 31, 2019, 05:45:17 pm »
Quote
I can see in the future PCBs where the tracks are really printed and the ICs are embedded inside the PCB, not on the surface.
Some of this is actually being done already:
https://www.microsemi.com/product-directory/services/3710-package-miniaturization-services
https://nmi.org.uk/wp-content/uploads/2016/10/1-IMAPS_UK_2016_Ostmann.pdf

The initial costs must be insane, but probably worth it.
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Offline GlennSprigg

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Re: Built in resistors in PCB
« Reply #4 on: August 01, 2019, 12:00:30 pm »
I was led to believe that some original IC's, had 'Pseudo' components, like....
Very thin 'tracks' as resistors, and very CLOSE tracks as Capacitors ??
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Offline SiliconWizard

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Offline @rt

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Re: Built in resistors in PCB
« Reply #6 on: August 01, 2019, 02:15:25 pm »
If I etch the copper I might get a capacitor.
 


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