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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2
votes
2answers
268 views

Why we need the PCB Panelised for assembly?

I have a PCB finished in invidividual size for customer but they gave me comment that it can't be used by their assembly vendor and ask me make the new batch for them, When we make the board in 2 up ...
5
votes
4answers
497 views

How can I make a decent ground plane in Eagle?

I've made a couple of simple PCBs as a hobbyist, and for the first time now I want to add a ground plane pour but I'm having some issues. As I have currently understood I need to: Create a polygon ...
3
votes
1answer
198 views

Understanding source and return current flow on PCBs

I'm looking for advice and tips related to PCB board layout and signal+ground trace/track routing. I'm designing a 2-layer analog-only PCB that has several I/O signals leading to and from other ...
0
votes
0answers
42 views

NOT consistent Euler Paths in logic diagram. What now?

i'm working with non-series-parallel arrangements, something like this: as you can see, the euler paths in pull-up and pull-down are differents. for example, in pull-up we have "abcde" and in ...
1
vote
1answer
56 views

Routing Audio Ground - needed or not?

I'm trying to build a guitar pedal switcher (efectively a box that provides multiple effect loops that can be independently bypassed from a single microprocessor) and while building a working ...
2
votes
1answer
131 views

RMII MAC side routing and signal integrity

I have some signal integrity and EMC questions. In my board LPC1768 RMII interface is connected to LAN8720. Because of pin locations some RMII signals must go through bottom layer. This is a four ...
1
vote
1answer
120 views

DDR4 routing / spacing guidelines

Where can I find the source of routing guidelines for DDR4. I'm talking about things like DQ to DQS timing, maximum length difference in ps for address and command and maybe maximum parallel run ...
3
votes
2answers
67 views

Multiple traces for single connection in Eagle

I'm manually routing a power distribution network in Eagle, and am trying to follow the IC vendor's recommendation to attach vias to the power plane both left and right of the bypass capacitor's ...
1
vote
1answer
107 views

Can I connect all ground connectors via the ground fill?

I am working on a very, very simple two-sided PCB design that connects one 8-pin header with 6 audio jacks, each of which has its right channel and ground connected. All grounds are connected via ...
2
votes
1answer
176 views

Four layer PCB power plane

I need to design a system on a four layer PCB. The layer stack-up from what I know would be signal / components ground plane power signal My problem is, I have a system with a power supply of +-5V ...
2
votes
1answer
182 views

How to route to a hidden pin in Altium

I'm using Altium Designer 14.2.3 and I have a connector on which are always two pins connected to each other. In my schematic library I have configured the Pins to be hidden and connected to the ...
0
votes
1answer
61 views

Power analysis after placement and routing of ASIC

How can I procure the files stating the details of power consumption of the chip after PNR in SOC Cadence Encounter?
3
votes
2answers
302 views

Bypass capacitor placement in Eagle

I've just placed a large FPGA in a QFP package with 144 pins in the middle of my board, and would now like to add bypass capacitors on the power supply pins. The power and ground pins are either next ...
2
votes
1answer
76 views

Eagle: Pins on FPGA exchangeable, depending on configuration

I'm trying to do the PCB design, using Eagle, for a small board with an FPGA that basically just routes the I/O lines to the outside. So, for the purpose of routing this board, the pins are basically ...
1
vote
1answer
599 views

Where is Cadence's Allegro Design Entry HDL 16.5 Snap o Grid Option?

I am looking for the snap to grid option? Any idea how to enable it? I did try looking on Cadence forums and documentations, but I did not find anything. Also any idea how I can move ...
10
votes
2answers
661 views

Acute angle routes in PCB

Following is from a PCB that I am presently working on. That particular path signals are of 100-400kHz signals. Is there any problem in having routes of this kind?
0
votes
1answer
167 views

Altium trace width rule applied to blanket only

In Altium, I set a rule for PCB trace width and clearances for a high current net but I only want it applied to that blanket that I have created in the schematic. I have monitoring lines that wont be ...
1
vote
2answers
251 views

Have I routed this PCB correctly per the schematic

This is my first PCB for production, and I'm not sure if I've correctly routed it. Mostly I'm concerned about trace running from pin 5 of IC1 to C3/C4 and how that picks up the +5V, which I've routed ...
1
vote
0answers
152 views

Routing rules for components in Altium

Is there a way to make a speciffic routing rule applicable only for selected components (or component class)? I want to define some "routing width" rules that will start routing the same net (e.g. ...
0
votes
0answers
39 views

Direct power based on voltage

Long story short, I've been asked to help in a board design but I don't have sufficient knowledge about them, so please bear with me. Here we go, I have two LEDs (L1 and L2). As a start both L1 ...
0
votes
1answer
216 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
votes
2answers
2k 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 ...
22
votes
2answers
1k 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 ...
0
votes
0answers
200 views

Eagle autorouting problems

Alright - I'm on the same project as I was in the last question I asked, where I am trying to mount four Spartan-6 FPGAs (specifically, the BGA256 variety) onto a DIMM-form-factor card. All has gone ...
3
votes
1answer
393 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 ...
4
votes
2answers
2k 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 ...
6
votes
2answers
567 views

Purpose of “wave shaped” PCB traces

On some PCB designs, specific traces are routed in curios ways. This probably has to do with high frequency design considerations and general signal behavior that i am not familiar with. Lets take ...
1
vote
2answers
229 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 ...
14
votes
2answers
421 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 ...
5
votes
2answers
279 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
votes
1answer
149 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 ...
-2
votes
1answer
98 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 ...
-2
votes
4answers
423 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. ...
0
votes
1answer
171 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 ...
3
votes
1answer
295 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 ...
3
votes
1answer
390 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 ...
11
votes
1answer
1k 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 ...
4
votes
2answers
1k 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 ...
5
votes
2answers
282 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 ...
2
votes
3answers
198 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 ...
6
votes
3answers
1k 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 ...
4
votes
1answer
1k 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 ...
1
vote
3answers
588 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 ...
2
votes
4answers
5k 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 ...
1
vote
0answers
651 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 ...
5
votes
3answers
574 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? ...
0
votes
1answer
49 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 ...
5
votes
2answers
323 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 ...
2
votes
0answers
719 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 ...
26
votes
2answers
839 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 ...