Layout is the process of designing a PCB including placement of parts and routing of traces.

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2answers
215 views

PCB Layout - Ground Plane Return Path

I am designing a 4 layer PCB with power planes and a ground plane, with mixed voltage signals and high currents. I have two possible isolated ground plane configurations, and I am wondering which ...
3
votes
1answer
81 views

Multiple fingers vs single finger layout (MOSFET transistor)

Please, provide a summary of advantages and disadvantages of a transistor layout with multiple fingers (MF) vs single finger? When laying out a MOSFET with a particular width and length, in an EDA ...
0
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0answers
43 views

PCB layout for filtering an input signal external to chassis

I read this Murata Know-How presentation on PCB layout for a filter for an input signal. Judging by this picture, do I have to make a separate polygon GND for filter output? And connect this polygon ...
2
votes
1answer
68 views

Help on defining the 8-layer stack-up for a high speed design

In many of the PCBs of my company we have done the stack-up as following: (stack-up A) Pads/GND/Some LF signals Signal1 Signal2 GND plane PWR planes (more than one due to several secondary supplies ...
0
votes
1answer
42 views

GPS chip antenna- design query

I am trying to design a gps data logger. I am not able to comprehend the chip antenna layout given here. The pads 1 & 2 in the layout share the same terminal? Isn't it same as connecting the ...
2
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0answers
36 views

Help with deciding my layout for EMC tests and SI. Different alternatives.

I am thinking what way would be the best to layout my system in order for it to have the best SI and pass EMC tests. My system consists in two PCBs joint by a flat flex cable (up to 7cm) and these are ...
3
votes
2answers
87 views

SMPS PCB Layout

I am using a couple of SMPSs (MPM3610) on a 4 or 6 layer PCB. The recommended PCB layout seems to use solid copper regions to connect the design together. Should thermal-reliefs be used on the ...
0
votes
1answer
54 views

DC barrel jack layout

1) I am using this DC barrel connector in my PCB and I want to make sure that when connecting a Center-positive power supply, my positive pin will be (1) and my two negatives will be (2) & (3), am ...
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1answer
35 views

Altium ring shaped pad

i'm trying to create an airtight soldered mount for a pipe on a pcb depth sensor board I'm designing. To do this I am trying to create a custom pad in Altium that is a ring and is also plated. I've ...
12
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5answers
777 views

Circuit board without EDA

For me there is no doubt that one of the most time consuming tasks when it comes to produce a new board is going from a ratsnest to the final layout. I must admit I am not an expert, but to me it ...
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0answers
38 views

How to know component size in Altium layout

I have a layout PCB in Altium Desiger and need to know the size of some specific components, ex: 0402, 0603 ... etc Is it possible to choose any component and know its size ?! BR
0
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1answer
32 views

Which side of SPI link harness to locate SDO pull-up?

I'm looking for some help/insight into a decision I am making about whether to change a circuit I have built. My slave device requires a pull-up on its SDO (MISO) pin which is open collector. When ...
3
votes
1answer
58 views

Guard Ring Nuances

I am working on a project for work and the OP-AMP we use requires a guard ring on the inputs. The original product was designed by another engineer we no longer have contact with. I'm revamping that ...
0
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1answer
53 views

MCP16301 Step Down Voltage Regulator PCB Layout Validation

I'm looking for some feedback/validation that the layout for this MCP16301 is correct. I'm trying to get 600mA 3.3v Out from 12 input. I'm using the circuit as described in the datasheet on page 23 ...
0
votes
1answer
30 views

StarRC extraction types vs process corners from foundry

When extract layout with extraction tools such as StarRC..., we have types of extraction such as RC, C types. From foundary such as TSMC, Samsung, they provide us with corners such as RCbest, RCworst, ...
2
votes
0answers
58 views

Flash memory : What are blocks and pages from a physical standpoint?

I would like to know the link between the physical layout of NOR and NAND flash cells and the concept of blocks and pages. I would also like to know the exact reason for why erasure only happens in ...
1
vote
2answers
109 views

High DPI (4K) And EAGLE CAD

Anyone know how to make UI text and objects display larger in EAGLE CAD. I just got a laptop with a 4K display and it looks beautiful but the text in some programs is microscopic
1
vote
1answer
78 views

Draw routing on PCB without components

Is there any way to draw routing on a PCB in the software PADS Layout without any components, like the CAD images below? If PADS Layout doesn't work, does Eagle have this function? Also, can I resize ...
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0answers
29 views

Altium PCB Layout: Does each pcb footprint and trace segment have a unique identifier. Which stores information about at what time it was laid out?

Is there any information about when an element is placed on the PCB file in Altium? A unique chronologically generated ID maybe?
0
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2answers
81 views

Altium PCB Layout: The Difference of Through Via, Micro Via, and Burried Via

This is my very first time doing 4 layers PCB layout. What is actually the difference between Micro Via and Buried Via? Say I have Layer 1, Layer 2, Layer 3, Layer 4. What I know I use the Through ...
0
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1answer
39 views

Order of Physical Proximity for Decoupling Capacitors

I have completed a schematic for a PCB and selected a series of decoupling capacitors for usage with a variety Xbee format radios on one board (i.e. one at a time, but changeable). I have included in ...
3
votes
1answer
60 views

Place via for BGA component in Kicad

While layouting in Kicad I've encountered a problem to place a via for BGA component. I design 4 layers board, I have 20-pin BGA component on the front, and I want to place vias for it on the back ...
0
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1answer
45 views

Dipole antenna RF Layout

I am designing RF layout on PCB, my PCB is in Circular form, In Pic 1, is my current layout in PCB, since this chip antenna is dipole in nature , so to form the dipole antenna there should be mirror ...
5
votes
4answers
452 views

Can you load Gerber files back into a PCB layout designer such as Eagle?

There's a PCB I may need to change a solder pad, but the schematic and layout are gone and were not added to source control. Is it possible to load the Gerber files back into a designer to change the ...
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0answers
29 views

Stamp Errors in layout

I am working on layout. I have two power supplies. For this when I took a via from Metal1 to n well I got no issues. But when i consider another via from Metal1 to n well, I am getting the following ...
0
votes
1answer
33 views

Creating Cadence Virtuoso Layout in Rectangular MOS Power device [closed]

I am trying to create a Power MOSFET with W/L = 9.2mm/1.6u This value is as per the design specification obtained by simulation using schematic value. I am new to Cadence Virtuoso and would ...
0
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1answer
36 views

How to remove pin name from Eagle Device Page? [See Image]

How to remove those pin name from Eagle Device Page?
3
votes
3answers
219 views

CAN bus layout design

I am trying to design a CAN bus node. The CAN bus shall be split-terminated with 120Ohm, 60Ohm for each line. Therefore i tried using this paper to calculate a characteristic impedance of 60Ohm for a ...
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vote
1answer
85 views

USB 2.0 layout on 2-layer board

I have laid out this board that includes (among other lower speed connections) a 1 upstream and 2 downstream ports on a 0.5mm FR4. The USB differential traces are 0.6mm wide with 0.15mm spacing ...
0
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1answer
37 views

How to to design a PCB lib for components with variable dimensions?

I'm designing various PCB libraries for components. But sometimes they have variable dimensions: How should I design the pads for components with fluctuating values?
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2answers
99 views

Which layer contains the board outline in PADS Layout?

TL:DR If I create or import a board outline on PADS Layout, in which layer(s) is it drawn? Can I make it visible/invisible? On Mentor Graphics PADS, I'm trying to import a board outline from a ...
0
votes
1answer
109 views

Chess-Board schematic/pcb layout

Hey guys as described here I also want to make a chess board with some arduino support. Here I want to ask some questions regarding the schematic and the pcb layout I am planing to do. @Dmitry ...
4
votes
1answer
109 views

Optional feature in PCB layout of MMCX board edge connector. What's it for?

I'm designing a circuit requiring MMCX board edge connectors, specifically using the Molex 73415-0961 jack. When looking through the datasheet for suggested PCB layout, I see mention of an additional ...
20
votes
3answers
1k views

What's the purpose of traces that are later punched out?

I've found this odd feature on an FPC in a Camera than handles button and switch input. You can see there are traces that look like they were once connected and later punched out to be cut. The one ...
0
votes
2answers
111 views

How to Allow Shorts Between the same Net in Altium

I have some pads and tracks that are different primitives but are the same net in an Altium layout. Altium keeps flagging these as ShortCircuit DRC violations, but they're the same net, so I don't ...
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0answers
28 views

Can Inkscape be used for layout editing for photolithography?

Inkscape is capable of exporting DXF files, a format that is accepted by photolithography masks manufacturers. Before I start working on layouts with Inkscape I would like to know if the exported DXF ...
1
vote
1answer
38 views

Resolving airwires in EAGLE for valid wires

I have a board(brd) file in Eagle which shows several airwires for connected nets. I have tried to fix the airwire via ratsnesting, confirming net names and just about every resolution I could ...
3
votes
1answer
284 views

The need for SMD neck-down constraints

I am designing a PCB which has +5V input from a USB jack and I want this power trace to be as large as possible to reduce input resistance. While doing my large traces on my PCB tool, one of the stock ...
2
votes
1answer
235 views

Spikes induced on PCB. EMC problem?

I designed the following PCB, where after testing a faced a severe (EMC related?) problem. This board houses an STM32F103 developing board. On the right of the PCB, there are 6 thermistors connected ...
3
votes
3answers
178 views

PCB layout needs improvement

I have been working on this layout. Lack of my training, my layout looks amateurish. Can I please get some general direction/tips on improving this design? Some details: Breakout board with USB/...
5
votes
1answer
63 views

Placement of two independent crystals

This one is completely about PCB layout. I have two 26MHz crystals in the design, one for each processor on the board (TXC 7M-26.000MEEQ-T, datasheet: http://www.txccrystal.com/images/pdf/number-...
6
votes
4answers
941 views

What does “V.A.” mean in datasheet dimensions?

I'm looking at a datasheet for an LCD panel (pdf link to datasheet). I don't understand these two encircled dimensions: What does the acronym "V.A." mean for these dimensions? I have referenced a ...
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vote
3answers
79 views

routing of signals

My doubt relates to a routing style of signals. Speed is not the criteria as the signals are not high speed. Kindly refer the image below please - . There are 2 ways to route signals. They are both ...
7
votes
1answer
501 views

PCB microcontroller layout in a mixed-signal system

This is a direct continuation of this question. So here's my layout, what do you think about the microcontroller side? EDIT: based on Armandas' answer, I'm now under the impression that the ...
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vote
2answers
147 views

Board to Wire Connector Type used between Small Display and Main PCB

I'm in the process of designing a PCB/Prototype and looking at different types of board-to-wire type connectors. In particular, I want to connect an SPI OLED display to the main PCB. It needs to be ...
7
votes
1answer
298 views

Two-sided connectorless USB on a PCB

This question is inspired by Connectorless USB on a PCB. I saw a cool USB LED on AliExpress that can be inserted in either direction: I'd like to build a board with a similar symmetric ...
11
votes
2answers
701 views

How many ground and power pins to have in a connector?

I'm designing a daughter board for a project. There are 35 I/O pins that need to go to the board. How do I determine the number of ground and power pins to include? How do I determine the placement of ...
35
votes
5answers
5k views

Why should you use two resistors in parallel on an LED?

So I was looking over the Arduino R3 schematics and noticed this little design choice: What is the reason for doing something like this? I mean it's hard to know what the designers were thinking, ...
0
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1answer
116 views

Where is pin 1 in Molex connector?

In 54722-0604, which is the pin #1? connector page at molex.com
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59 views

Layout recommendations for an older DC/DC

I'm currently working on getting an old voltage regulator chip from TI to work. The TPS65530 is an 8-channel DC/DC Converter and thus quite crowded. I have not been able to find a reference design ...