Questions tagged [routing]

Questions relating to the routing of printed circuit boards (PCBs) which involves the placement of tracks on the board. It may be performed manually however many PCB CAD programs provide an autorouter to assist in the process.

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1answer
995 views

How do I create “beveled” T-intersection traces in Eagle CAD?

Frequently it is convenient to route traces on a PCB such that some other traces or pads are at right angles to a common bus. However, this creates "T" intersections which have 90° angles, which can ...
2
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3answers
14k views

Any-angle routing in Altium?

I have a design with a very thin and curvy board shape, so any-angle routing is absolutely required. My favorite EDA software is Altium, so right now I have only two options, both bad, for how to ...
29
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2answers
8k views

What is Manhattan routing?

In an answer by The Photon he mentions 'Manhattan routing' in regards to PCB design. I haven't found a lot of relevant information about this term on the internet; therefore the question: What is ...
3
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1answer
1k views

Are traces exiting a pad at an angle bad?

I have been told in the past that you should always have traces leaving a pad on a straight line. The reason I was given was that it could create an acid trap. From what I have read this is not ...
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2answers
8k views

What is the best way to layout a PCB with crystal oscillators and MCU?

I have heard that the clock circuit is a noise source and that the clock circuit is also sensitive to noise. I believe that keeping the clock circuit close to the MCU and keeping other routes or ...
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2answers
10k views

Purpose of “wave shaped” PCB traces

On some PCB designs, specific traces are routed in curious ways. This probably has to do with high frequency design considerations and general signal behavior that I am not familiar with. Let's take ...
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2answers
431 views

Routing in Altium

Here is a picture of board: I want to route pad 23 to 48. But the path gap is narrow. So I am not able to route it. Auto routing also couldn't route. I changed the design rules for solder mask and ...
15
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2answers
1k views

Why would the VCC/GND pins of an ATtiny26 not be aligned?

In the following pinout diagram for an ATtiny26 microcontroller, a 20-pin IC: The VCC/AVCC and GND pins aren't aligned. Surely it would be easier for PCB design to connect these by going straight ...
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2answers
929 views

Soldering lifted central pin of TO-252-5 package

I found a very nice voltage regulator of ST (LD39300). But the LD39300PT-R has a package with a lifted central pin (TO-252-5, DPak (4 Leads + Tab), TO-252AD). Here is a photo: I just want to do a ...
6
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1answer
203 views

Its ok use different layers for power?

For example in a double side board I'm using one layer as gnd and the other layer as power, and then I route the whole circuit inside the planes. Is that ok? Because I saw that usually both sides are ...
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1answer
150 views

Altium help with Routing

I am working with a new computer at my company learning Altium. I have created the schematic and the PCB files inside my project and successfully imported everything from the schematic to the PCB. My ...
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4answers
2k views

Triangulate with Ping [closed]

Is it hypothetically possible to triangulate the location within any accuracy of a server at an unknown location by using ping times? 9 computers with location known log on to a multiplayer server. ...
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1answer
367 views

STANAG 3350B pcb guidelines

What are the pcb routing standards that I have to follow for routing STANAG video signals on my pcb? Specifically, what are the impedance requirements? Is it better to route as a stripline or ...
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1answer
644 views

SPI routing question…Maximum length SPI can be routed

Basically my question is regarding maximum length of SPI routing, and route efficiently in my scenario and any timing issues(Setup and Hold). I am just explaining my scenario. Please bear with me, it ...
6
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2answers
1k views

Power Plane and Decoupling Capacitors Routing

Forgive me for my simplicity. I'm just a hobbyist and not an engineer by trade. I am trying to make my first 4 layer PCB in Eagle and I have a question I cannot find the answer to regarding power ...
13
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1answer
4k views

GPS Design Review (RF Input)

I've designed a PCB in Eagle to host a GPS Receiver module and a GPS patch antenna. The RF input to the module is specified as a 50Ω unbalanced (coaxial) RF input. I used this calculator to calculate ...
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2answers
11k views

Creating a high-current bus on a PCB

I'm planning a custom power-distribution / fuse-board for in-car application, but that requires carrying high currents (50A+ @12v*) on a PCB trace. Since I'd like to keep the board cost, and physical ...
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2answers
598 views

PCB Design Considerations - Copper Pouring

So after a very long effort, I think I've finally come towards the end of my PCB board design. It's a two layer board with no ground or VCC plains (Re-routing is not an option) as I can't go though ...
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3answers
246 views

Routing of an ASIC chip - time taken?

In a typical ASIC design cycle, how much time is taken by an EDA tool to complete the routing? Assume a fairly complex chip (like the Ivy Bridge). I've heard the entire chip design cycle is typically ...
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3answers
5k views

How to join 3 traces is a PCB?

Usually I route my PCBs never making a 90º turn as best practices recommends, but sometimes there are points were 3 traces must intercept, if I always do 45º turns, in this intersection will be a 90º ...
8
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1answer
10k views

How to connect ground planes together

What is the best way to connect ground planes together ? I know that ground planes are connected together at multiple locations in order to keep a low impedance GND across the whole board and provide ...
2
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3answers
1k views

Routing +12V and -12V for audio opamps?

I have 4 opamps which need +12 V and -12 V supply voltage. I have 2-layer PCB and want to keep it that way; the bottom layer is dedicated for GND of course. To keep noise/EMI as low as possible, +12V ...
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4answers
15k views

How to specify 100 ohm impedance on a pcb gerber

I've been using Altium for several years when I've needed to designed boards. However it's all been for simple analog designs and never anything too technical. I'm now trying to take a jump into a ...
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0answers
2k views

0.5mm Pitch BGA Fanout - Reasonable Vias, Drills, Traces and Clearances

I'm pretty new to layout and using Altium. I need to break out a 0.5mm pitch Spartan 6 BGA, I want to use "reasonable" vias, drills, traces, etc... but I don't really know what that means now a days....
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4answers
3k views

Does there exist an IC that allows on-the-fly routing of signals?

Do there exist ICs with N input pins and N output pins which, either via EEPROM setting or via on-the-fly control by a microcontroller, allow one to route each of the N inputs to ANY of the N outputs? ...
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1answer
55 views

Routing Current to Many Individual Channels [duplicate]

Possible Duplicate: How to implement an isolated connection matrix I need to put current on up to 30 lines; one at a time. What kind of electronics solutions are there to this kind of problem. ...
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2answers
715 views

Satisfactory Margin for Traces from PCB Edge

I've had problems routing too close to the edge of a PCB before and was wondering if there's a suitable rule-of-thumb that I should use (maybe to put in a design rule in Altium somehow with my keepout)...
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0answers
1k views

Add external antenna to router with only internal antennas? [closed]

Does anyone know if its possible to add an external antenna to a router with only internal antennas? I'm trying to improve the signal of my Linksys e4200v2. I'd like to add a high gain antenna if ...
31
votes
2answers
3k views

Ground ring — good or bad?

Here are two routings: Which is better? On one hand, the first is bad because ground ring is one-turn coil, hence induction current will be appear. On other hand, the second is bad because potential ...
25
votes
6answers
31k views

Finding air wires in Eagle

I am almost done routing a board. However, is telling me that there is still one more wire. I have looked but I just can't seem to find it. Is there a to make Eagle tell me where it is?
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2answers
11k views

EAGLE PCB How to set drill clearance?

I have designed an land pattern for a micro USB connector. The connector have 2 x 0.9mm drill holes under it. The problem is the clearance distance around these holes being to big and overlaps the ...
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1answer
1k views

Altium Camtastic Auto-Rout PCB Border is routing over edge of board

I typically draw rout tool paths by hand, but I though I would give Altium's built-in router a try. The command I am talking about is Rout->Auto-Rout PCB Border within the CAM document mode. The ...
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2answers
584 views

Does pin order matter at all for this RAM?

I am trying to route a pic32 chip to a 128kB SRAM chip and having a bit of a hard time getting all 17 address lines and all 8 data lines connected. I am trying to tie the first 16 address pins to ...
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2answers
4k views

Sharing an oscillator between two ICs

I have a microcontroller and an FPGA on the same board. If they're both going to run at the same clock speed, can I just use one oscillator to clock them both? There seems like there is something I ...
3
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3answers
3k views

SDRAM issue - LPC1788

I have been using an NXP LPC1788 dev board which I have developed my application on (.NET Microframework Cortex-M3 Port). Everything was well and good on this board, I had no issues with RAM or ...
8
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1answer
3k views

My 12 MHz crystal does not oscillate

I am having trouble with a board I have had fabricated. The processor is an NXP LPC1788 Cortex-M3. I am using a 12 MHz external crystal to clock the processor as recommended in the datasheet. ...
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5answers
4k views

PCB (Auto-)Routability

Background I'm working on a fairly dense mixed PTH/SMD (plated through hole / surface mount) component PCB design. I'm using Eagle CAD for it for the schematic capture / layout and I'm using the auto-...
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2answers
3k views

Is it normal to have a rats-nest of VCC/GND traces under an IC?

I'm attempting to route a simple board, the first I've done in 15 years since I routed a 12V linear power supply in the equivalent of mspaint. This board consists mainly of an LPC2387, which is an ...
10
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4answers
23k views

Changing all via and routing sizes at once (Altium Designer, PCB Design)

I have a completed PCB design drawn by Altium Designer. I want to increase via sizes. But there are too much of them, and changing all of them one by one will be a very long and bothersome work. Is ...
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3answers
5k views

I2C routing configuration

I have several slave devices communicating with a microcontroller master on an I2C bus. My PCB is only about 1" x 1" and the devices are only communicating at 400 kHz. What is the best way to ...
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3answers
2k views

CPU considerations for PCB software (routing) when purchasing a new computer

My company uses Altium Designer for PCB design and the most CPU intensive operation seems to be the autorouting. My question is, when considering a new computer, would it benefit autorouting ...
63
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10answers
33k views

Why is there such a strong preference for 45 degree angles in PCB routing?

I've always wondered this: every single modern PCB is routed at 45 degree angle increments. Why does the industry prefer this so much? Doesn't any-angle routing offer more flexibility? One plausible ...
4
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6answers
3k views

Using TopoR with EagleCad

I just learnt of TopoR routing software. It routes PCB traces without grids, with curves and arcs for reduced trace length and vias. http://www.toporouter.com/ But its not a complete PCB routing ...
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11answers
31k views

Solid ground-plane vs Hatched ground-plane

So recently when i was routing a PCB , I came across the option to either fill/pour my ground plane with either solid or hatched copper. I've also noticed that the old arduino duemilanove also had a ...
3
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1answer
629 views

How do I connect a pin that is not included on the main symbol or any of the gates of an Eagle part?

In Eagle, I've dealt with a couple of parts that have pads that don't seem to be accessible from the schematic: HTSSOP packages with a thermal pad that should be connected to a ground pin; a battery ...
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9answers
17k views

Do you layout in mil or mm?

I have been using 10 mil trace with 10 mil spacing. The PCB vendors quote that they like traces down to 7 mil. But then I ran across a PDF showing how to fan out a QFP to get all the signals ...
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8answers
12k views

Advice on going from rat's nest to routed PCB

Can anyone offer any useful strategies on going from a rat's nest to a routed PCB? (I'm using Eagle and aiming to make single/double sided PCBs at home) Drawing the schematic is fine, but when it ...