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Questions tagged [layout]

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

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42 views

USB 3.0 Length matching in PCB Layout

I'm doing PCB layout for a USB 3.0 connection and I'm curious about if there's a length match requirement between the unidirectional super speed pairs and the bidirectional high speed pair. This isn'...
4
votes
1answer
90 views

PCB layout rules

What are the design rules that should be applied when designing a PCB layout ? I am currently using Kicad, because it is free and it is simple to use. I made a layout for a L200 power supply. I wand ...
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1answer
1k views

What breadboard simulation software is this?

I'm not familiar with what software is available and cannot recognize the origin of this diagram. Does anyone know what software this is? I'm only guessing that it can perform simulation; it may just ...
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0answers
93 views

First 4-Layer Board + Layout advice please ( possible gnd loop solution ?)

This is my first 4 Layer layout. I've done many 2 layer boards in the past, but to be honest, I've been doing boards without taking special care when working with mixed signals ( Analog, digital and ...
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0answers
19 views

GDS, OASIS, etc. vs LEF/DEF: which is better?

I have two questions here. By the way, I have searched about the differences but I wanna know more. So, Can LEF/DEF format describe everything that GDS, OASIS, etc. formats, can? What can I do with ...
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3answers
2k views

Is it ever bad to run an IC VCC trace next to a ground plane with 1mm clearance?

Since my last board flopped, I looked at it again and noticed a ground loop (because the DB9 casing completed the loop). Now I adjusted my board so that there is no loop of any kind. Instead, I'm ...
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2answers
40 views

How can I attach the same footprint to subparts of the same IC in Altium?

I have two sub parts of the same IC (STM32L476RG). I have added these sub parts as two components in the same schematic library and have attached the same footprints for both of them. But when I ...
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1answer
32 views

How to get isolated area using Eagle CAD?

I've created an area using ratsnest and a simple route as you can see in the first example layout. Both belongs to the VIN net. Then I added a GND polygone. Using the ratsnet function I'm expecting ...
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2answers
37 views

How to generate board plot/image in Eagle

I designed my own PCB in Eagle so I have both the schematics and the board files. I would like to generate a figure like this one made for Arduino board in order to include it in the user manual that ...
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0answers
46 views

What is the cause of Capacitor short & Soldering pad short & Current unstable on PCB as powering up over time

For the first time, I made a 4 layer PCB and used a lot of 0402 cap / res on my board. But after I soldered the board, the circuit can only work for several mins. The four layers include 3 signal ...
2
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2answers
83 views

Putting GND on POWER layer

I have a four layer PCB, with a traditional: signal layer, power layer, ground layer and final signal layer. Due to the set up with the power rails, there are some large spaces on the power plane ...
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0answers
50 views

Creepage Distance in Altium Designer

I have a design with a high voltage and a low voltage part. Between the two I need to have a creepage distance of 8mm. Some optoisolators I use in my design are not wide enough on the PCB footprint, ...
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0answers
58 views

ADS keysight: layout of 2 diodes in same packaging

I am trying to design the layout in ADS of a circuit which has 2 diodes, although in the same packaging, so only 1 footprint is needed (actually SOT23). Main schematic: I have included both diodes ...
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1answer
61 views

Defining a circular cutout in a pad in Altium

I'm creating the footprint for a Wurth inductor, 744043100. The recommended land pattern is below. They use a radius 1.8 mm circle in the middle of the component to define a void in the pad. I'm ...
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0answers
19 views

Maximum metal length and single connection routing in Virtuoso Layout XL

In our process technology we have only 2 metal layers. The first metal layer can be used for routing but the second metal layer is used to make a jumper over metal layer 1 (in case of crossover) by ...
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0answers
18 views

CADSTAR PCB layout pad name

I am new to CADSTAR. But I have learned a lot in 2 months. I have the Schematic as shown. But when I generate the PCB file , I don't see the IC pad name/ number.(Marked in the following picture with ...
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1answer
74 views

Routing of PCB layout/layout review after the schematics [closed]

How do I learn PCB layout review by myself?
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2answers
88 views

Non-isolated DC-DC buck converter layout - which one is better

I'm doing a DC-DC buck converter routing, using TPS62130. As known, the key point to route a DC-DC converter is to reduce the current loop area. In my design, I have a dedicated ground plane, so I ...
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2answers
493 views

Single ground plane vs split planes?

I have seen conflicting sources about ground plane design. I have been told at my work many times, just slap a single massive ground plane in and that works well enough, we don't deal with anything ...
2
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2answers
177 views

Ethernet ground multilayer pcb

I'm currently re-designing a 12-layer pcb. The only thing I am still struggling with is the routing of the ethernet. The layer stackup is as follows: Top Layer GND_1 MidLayer_1 PWR_1 MidLayer_2 ...
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2answers
79 views

Thermal stabilization of TH LED (layout recommendations)

I have to develop a circuit for LED-based optical reference. Due to specific requirements, only available LEDs are in TO-18 packages with metal cans. The problem is that LEDs experience spectral ...
2
votes
1answer
250 views

STM32 MCU PCB layout review (crystal & decoupling & ADC)

Introduction: I am designing a hobby electronic for first time, using STM32 to control a soldering tip. I read many documents of PCB layout, and also many information from this forum. And this is my ...
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3answers
147 views

Is it possible to request a mapped diagram of electricity usage from your provider? [closed]

Whenever I see our electric bill, it just shows the amount owed, and the amount used (in kWh). However, it would be really nice if we could request or pay a premium per month, for a service that ...
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0answers
41 views

RN2483 PCB Layout

I am designing a board based on RN2483. As i have none experience on RF design i am following the guidelines from microchip's datasheet as the pictures bellow. So my question is about the many vias....
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1answer
55 views

Do I have to route VCC and GND signals on PCB if planes are used

I am designi a board where I have a VCC plane and a GND plane.I have decoupling capcitors and was wondering if I should manually connect these decoupling capacitors with a trace since I plan to have a ...
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2answers
540 views

Unused area on layout

I have prepared the following PCB layout I am a hobbyist and when I look at other - professional - boards, mine looks a little strange when considering the empty spaces to the right, and to a lesser ...
2
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1answer
108 views

Mark decoupling capacitor

I'm working on a PCB. As ECAD software I am using KiCAD. All ICs will get two decoupling capacitor. One 100n ceramic and a 10uF electrolytic. For now I place them like shown in the picture at each ...
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0answers
108 views

6 layer PCB layout with RF antenna track

I am doing my first 6-Layer PCB with RF antenna connection tracks. I am using this stack-up: L1 Signal Layer L2 Ground Plane L3 Power Plane L4 Signal Layer L5 Ground Plane L6 Signal Layer I ...
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3answers
85 views

Plated PCB Hole Shorting Power to GND?

I’ve been soldering components to my PCB; all has been good, but recently, after soldering a big electrolytic through hole cap, the power and gnd plane were shorted. This persisted even after removing ...
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0answers
109 views

W5500 Ethernet Chip Layout Advice/Help

I am working on a project that includes the W5500 circuit, this is the first time i had the opportunity to layout Ethernet Interface circuits. Schematic: Whole board and W5500 Module Layout ...
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3answers
73 views

Current Sensor Layout

I'm trying to improve my circuit layout skills. I'm currently working on a board that needs some current sensors. I've included a screenshot of the layout. I'm hoping some gurus out there can point ...
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3answers
78 views

Should a trace be connected through multiple pins on a pin header?

I'm designing a modular board, where the two modules are connected through pin headers. For mechanical stability I have more pins than traces and my question is that which is the better: route each ...
1
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1answer
52 views

MCU ADC and signal conditioning circuit layout

What are the rules of thumb for physical spacing of signal conditioning circuitry (say - some sort of high-speed sensor followed by a voltage follower opamp followed by a RC anti-aliasing filter)? ...
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1answer
74 views

Routing Ethernet Connections

I am routing Ethernet traces from a Colibri iMX6ULL computer-on-module to RJ45 Ethernet connector (In-build Transformer). The layout design guide says that Ethernet ...
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2answers
85 views

PCB Layout designing [closed]

Propagation delay is more in which topology (stripline or microstrip)??? I am having mutiple signals in a high speed board and some signal are routed too long than how can i say that board trace is ...
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0answers
48 views

Ethernet coupler with ground plane

I am designing a simple pcb with pass trough for ethernet using RJ45 Cat6 connectors. Rj45 in and Rj45 out Is it favorable from EMC perspective if both the connector shields are connected together ...
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2answers
67 views

High Speed design rules for 10GHz [closed]

When any layout is called High Speed Layout? What are the pins we should look for considering any board layout as a high speed design?
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1answer
68 views

USB Diff Pair used by 2 devices on PCB

My PMIC uses the DP/DN pair of USB type C to get the maximum current that it can draw to power up the circuit or charge the battery. The problem is that i don't have a hub and the signal from ...
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1answer
50 views

HDMI Through Hole Layout Issues

So this is my first post so please forgive me but inform me if I'm breaking any forum rules. I'm trying to layout a through hole HDMI connector in Eagle. The issue I'm running into is that the gap ...
1
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1answer
64 views

DDR Trace Length Inside Package from Simulation Model

The DDR4 in question is a Micron MT40A512M16JY. From the vendor site, you can get the datasheets, specs, sim models. I assume from the sim models you should be able to see the trace length of each ...
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1answer
133 views

can't remove a pad outside the board in ALtium designer 2016

i accidently placed a pad in my pcb layout outside the pcb box. but now i cant remove it. could you suggest a method to remove it? i use altium designer 2016.
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6answers
9k views

Have I placed too much on this PCB layout?

I am doing my first PCB layout (using Altium) and have finally gotten past the auto-router stage. The result is a mess and there are some missing nets and design rule violations. Have I packed too ...
0
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1answer
350 views

How to calculate the differential impedance for a stackup design

The design is basically a copy from a reference design. I used a few different tools to calculate the trace impedance with different results. While the manufacturer uses Si9000, the result does not ...
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1answer
176 views

How does my crystal PCB layout look?

Please suggest if the layout is fine: it is 25MHz 3225 crystal. I maintained short traced for XIN and XOUT. I maintained a guard ring around the crystal. I have grounding in layer just below. the ...
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1answer
43 views

Regarding 50ohm Impedance control trace

We have the query regarding Stack up, 50-ohm Impedance traces and its Reference Layers. Recently We want to fabricate 6 layers 50-ohm impedance controlled board. but in this PCB We have to Routed 50 ...
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1answer
114 views

Why use more than one contact in VLSI layout?

I saw the following layout in one of the standard cell library provided to us by the University. In the layout, the yellow color diffusion layer is connected to blue color horizontal M1 metal layer ...
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1answer
103 views

Why did this “backwards” power jack pass ERC in EAGLE?

As will become obvious, I am new to Eagle and PCB layout. I set out a simple design, starting with a power jack. The power jack seems to clearly have a "+" terminal labelled, so I connected that to ...
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3answers
186 views

Using Extra-Wide Traces

I am currently laying out the board for an audio amplifier I am working on. The power requirements aren't very high - there won't be much more than 500mA flowing through any given trace. However, I ...
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1answer
163 views

switching power supply pcb layout

I'm studing for the best practice to route a switching dc to dc step down regulator. Especially this TI's part (http://www.ti.com/lit/ds/symlink/tps54340.pdf). At the page 37 there's a layout example....
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2answers
451 views

Replicate PCB design on stripboard

I'm thinking about making a DIY project (this one). I'm a complete n00b, I just have some theoretical knowledge about electronics from some university courses, and I'd like to learn some more. I was ...