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Q&A

Posts tagged pcb-layout

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57%
+2 −1
Q&A Signals and plane on the same layer

Hi, I’m working on a PCB layout, which is only about the second board I’ve ever designed. I’d appreciate some help with the following issue: This board has two layers: The top layer is used f...

3 answers  ·  posted 13d ago by Eyal78‭  ·  last activity 7d ago by TonyStewart‭

62%
+3 −1
Q&A Does My Circuit Contain High-Speed Signals?

My circuit includes the following components: • PIC16 with internal clock, frequency: 32 MHz • ST LED2000 LED driver (a buck converter) with a PWM dimming input. The converter itself isn't a conc...

2 answers  ·  posted 11d ago by Eyal78‭  ·  last activity 7d ago by TonyStewart‭

71%
+3 −0
Q&A Power polygon and matching ground

For power polygon that primarily carry DC, how critical is it that it is located above a ground plane? If it is important, how crucial is it that the polygon completely overlaps the ground plane b...

2 answers  ·  posted 13d ago by Eyal78‭  ·  last activity 10d ago by Olin Lathrop‭

66%
+2 −0
Q&A Thick trace or a Polygon?

Suppose I use a wide trace as a power rail in my circuit (wide enough for the rated current, at a certain copper weight), and it doesn’t have an adjacent ground plane. If I have enough space on the...

1 answer  ·  posted 11d ago by Eyal78‭  ·  edited 10d ago by Eyal78‭

Question PCB pcb-layout
66%
+2 −0
Q&A Thermal Relief – Yes or No?

In my PCB design, I have 0402 components connected to polygons. To reduce the risk of tombstoning, I connected them using thermal relief. My guiding principle is that if heat dissipation is not sy...

1 answer  ·  posted 13d ago by Eyal78‭  ·  last activity 10d ago by Olin Lathrop‭

60%
+1 −0
Q&A Solder mask bridge issue

From what I understand, PCB manufacturing has a limitation on the minimum width of the solder resist—it cannot be too thin, typically not less than 5 mil. In many components, including those with a...

1 answer  ·  posted 17d ago by Eyal78‭  ·  last activity 12d ago by Olin Lathrop‭

33%
+0 −2
Q&A LNA layout consideration 1-1000MHz

Mini-circuits LNA PHA-LN13+ has suggested: Eval board Layout Eval Gerber The image took from the Gerber file (3rd ref.) (Though all 3-reference mentioned containing it): There I have som...

0 answers  ·  posted 10mo ago by mohammadsdtmnd‭  ·  edited 10mo ago by mohammadsdtmnd‭

Question RF pcb-layout layout
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Q&A Implementing local ground theory on PCB power distribution [closed]

I've tryed to implement a local ground concept told by Olin Latrop here : He have told: (What I've perceived)You should not connect every gnd point instantly to gnd plane, since it can inject HF ...

0 answers  ·  posted 12mo ago by mohammadsdtmnd‭  ·  closed 12mo ago by Olin Lathrop‭

60%
+1 −0
Q&A Noise from oscillator on top layer to clock on bottom layer with VCC & GND layers between

What effect does an oscillator potentially have on a SPI clk signal if the oscillator is on the top layer, with GND and VCC layer in between on a four layer board. I know running it on the same lay...

2 answers  ·  posted 1y ago by Hawk2020‭  ·  last activity 1y ago by Nick Alexeev‭

71%
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Q&A SDR SDRAM PCB Timing Budget

I am working on routing a microprocessor to two identical single data rate (SDR) SDRAM chips that are PC166 compliant, particularly Alliance AS4C16M16SB-6TIN. The 16 bit SDRAM chips are combined t...

1 answer  ·  posted 1y ago by DavidE‭  ·  edited 1y ago by Lorenzo Donati‭

75%
+4 −0
Q&A High Speed Digital Communication Bus Probing

For high-speed digital communication busses, what attributes do you generally advise to add to a PCB to help with validating the communication bus as well as troubleshooting the design? In particu...

1 answer  ·  posted 1y ago by DavidE‭  ·  last activity 1y ago by Olin Lathrop‭

66%
+2 −0
Q&A Using arc trace routing instead of 45 degree trace routing

Most modern CAD software for PCB design offers arc trace routing or a form of conversion between 45/90 degree angel trace routing and arc trace routing. Despite this, the overwhelming majority of c...

3 answers  ·  posted 2y ago by Mu3‭  ·  last activity 2y ago by Lundin‭

Question PCB pcb-layout
71%
+3 −0
Q&A What is a good PCB-layout?

I am an electrical engineering student and I just finished designing an ECG-amplifier circuit. Here is the schematic: - It is fairly simple. Initially, there is a 1st order highpass filter. Then...

1 answer  ·  posted 2y ago by Carl‭  ·  last activity 2y ago by Olin Lathrop‭

Question PCB pcb-layout ECG
66%
+4 −1
Q&A PCB ground planes with isolated voltage

I have designed a PCB that I need to work in which a microcontroller drives a 24 V brushed motor. The input power to the board is 24 V, this is then lowered to 5 V by a step down converter, and thi...

3 answers  ·  posted 3y ago by Alinik‭  ·  last activity 2y ago by KalleMP‭

80%
+6 −0
Q&A Standardized schematic/layout file formats for PCB CAD tools?

As we know there exists numerous different kinds of PCB CAD software. The big ones seem to be Eagle, KiCAD, Altium, OrCAD, Solidworks, DesignSpark and probably a few more. When it comes to mechani...

1 answer  ·  posted 3y ago by Lundin‭  ·  last activity 3y ago by Olin Lathrop‭

77%
+5 −0
Q&A PCB Copper Layer Spacing & Voltage Rating

One standard used for spacing conductors based on voltage is the IPC-2221. This standard differentiates spacing requirements for inner and outer conductors. Does the IPC minimum separation betwee...

1 answer  ·  posted 3y ago by DavidE‭  ·  edited 3y ago by Lundin‭

75%
+4 −0
Q&A Via on pad: acceptable or not?

I am designing a PCB with somewhat limited space. To save space, I am placing some vias on component pads. However, I am not sure if this is a good practice in PCB design. As far as I understand, t...

1 answer  ·  posted 3y ago by Mu3‭  ·  last activity 3y ago by Olin Lathrop‭

Question pcb-layout
75%
+4 −0
Q&A Thermal relief for through-hole on multi-layer PCB

When using through-hole ("THR") connectors on a multi-layer PCB, I frequently notice problems with the ground pins, when these are connected to the ground plane(s) through various "thermal relief" ...

1 answer  ·  posted 3y ago by Lundin‭  ·  edited 3y ago by Nick Alexeev‭