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About designing the boards which carry the components of an electronic circuit, including placement of parts and routing of traces. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, say which tool and version you are using.

0 votes
1 answer
121 views

Can I place a regulator in this way?

The regulator supports both digital circuits and analog circuits, which is shown in the diagram below. My question is: can I place the regulator at the analog part? The regulator supplies the digit …
richieqianle's user avatar
  • 1,622
3 votes
2 answers
3k views

Tips on routing multiple powers(+5/-5/+15/-15/3.3 and etc. ) for a four-layer PCB

The most tedious thing for me while routing PCBs are the powers. I have made several PCBs of these kind and it seems that I have not learned much from the process. The power connections are always a m …
richieqianle's user avatar
  • 1,622
2 votes
2 answers
549 views

How should Ground vias be placed?

I am using vias to filter the input power. The following to pictures show two ways of placing vias. I think both of them are inappropriate since the vias are not "fully" connected with ground through …
richieqianle's user avatar
  • 1,622
1 vote
1 answer
387 views

Where do the return currents go for a MCU with multiple Vdd and grounds?

I am reading this article on mixed signal design: https://www.maximintegrated.com/en/app-notes/index.mvp/id/5450 When signals have really high speed, the return current will tend to follow right unde …
richieqianle's user avatar
  • 1,622
2 votes
3 answers
192 views

How to design connectors when I do not know what the customers want?

My PCB needs to export four sets of voltages to our customers' PCBs. Eight pins in total are needed. Eight pins at my side are to be connected with eight pins at customer's pcb side. Our pcb is to be …
richieqianle's user avatar
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9 votes
3 answers
9k views

50MHz SPI PCB routing, use vias or resistors?

I am trying to route the SPI between MCU and ADC. However, the pin orders between MCU and ADC are not matched, there are crossings. A four-layer board is used.(signal - ground - power - signal) I ten …
richieqianle's user avatar
  • 1,622
7 votes
2 answers
2k views

How on earth shall I design the ground planes for mixed signal circuits, split or not?

Our circuit is like following: There are four layers, including top, power, ground and bottom. My way of grounding: I follow the instruction by Maxim: https://www.maximintegrated.com/en/app-notes/ind …
richieqianle's user avatar
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1 vote
3 answers
533 views

Four layer PCB, leaks current on edges

I was testing a four-layer PCB and got electric shocks several times when trying to touch the edges of the PCB. The four layers are: top/+15V/ground/bottom layer. It seems that there are several "whi …
richieqianle's user avatar
  • 1,622
5 votes
4 answers
3k views

For Multiple ADC circuits PCB layout grounding, why is "single point ground" important?

I am reading this article from Maxim on mixed-signal circuits grounding: https://www.maximintegrated.com/en/app-notes/index.mvp/id/5450 Everything makes sense to me until I read the "Grounding Chall …
richieqianle's user avatar
  • 1,622