# Schematic design

**URL:** <https://sierraconnect.protoexpress.com/t/schematic-design/522>\
**Category:** Schematic and layout\
**Created:** [November 22, 2023, 7:45pm UTC](https://sierraconnect.protoexpress.com/t/schematic-design/522 "2023-11-22T19:45:35Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Sajal\_ee](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@Sajal\_ee](https://sierraconnect.protoexpress.com/u/Sajal_ee)\
**Post date:** [November 22, 2023, 7:45pm UTC](https://sierraconnect.protoexpress.com/t/schematic-design/522/1 "2023-11-22T19:45:35Z")

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Hello, this is my first post on this fourm. Do we have people here working on schematic design and pcb layout ?

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**Author:** ![lucy.sierracircuits](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/lucy.sierracircuits/32/8_2.png) [@lucy.sierracircuits](https://sierraconnect.protoexpress.com/u/lucy.sierracircuits)\
**Post date:** [November 22, 2023, 8:12pm UTC](https://sierraconnect.protoexpress.com/t/schematic-design/522/2 "2023-11-22T20:12:48Z")

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Yes, we do. What’s your question?

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**Author:** ![Sajal\_ee](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@Sajal\_ee](https://sierraconnect.protoexpress.com/u/Sajal_ee)\
**Post date:** [November 22, 2023, 8:21pm UTC](https://sierraconnect.protoexpress.com/t/schematic-design/522/3 "2023-11-22T20:21:35Z")

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I have seen in some designs that analog reference ground plane is separated from digital reference ground plane. I guess this is to isolate digital switching from analog plane. But do we need to connect them together at one point in the PCB, normally near connector, is that correct ?

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**Author:** ![allank](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/allank/32/259_2.png) [@allank](https://sierraconnect.protoexpress.com/u/allank)\
**Post date:** [November 22, 2023, 11:39pm UTC](https://sierraconnect.protoexpress.com/t/schematic-design/522/4 "2023-11-22T23:39:26Z")

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If you separate the two planes completely then the usual method is to either tie them together directly (at some appropriate place, like the input connectors or tie them together with a ceramic capacitor (or sometimes a small resistor).

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<div class="post-metadata">

**Author:** ![Sajal\_ee](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@Sajal\_ee](https://sierraconnect.protoexpress.com/u/Sajal_ee)\
**Post date:** [November 23, 2023, 7:31am UTC](https://sierraconnect.protoexpress.com/t/schematic-design/522/5 "2023-11-23T07:31:04Z")

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Yes, I also have seen another design layout in which they have two via near the main power connector with a text on the silkscreen that short them with 1.6 mm diameter lead. I did not find this in schematic but in the layout design they have it. Thanks again for reply.