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.

1
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2answers
367 views

USB 2.0 data lines swap suggestion

I need your advice regarding the USB 2.0 signals routing. When I reach the USB connectors, the data lines (D+ and D-) have to be swapped. I have two options there: 1) swap the lines using vias and go ...
4
votes
1answer
545 views

Analog switch with a fixed state when not powered?

I am looking for a chip that could handle DPDT (or SPDT, or ultimately SPST) analog switch for audio routing (in the mOhm range resistance) and can guarantee one state when there is no power supply. ...
2
votes
1answer
45 views

How can I control the route to analyse with HyperLynx in a switch?

Good day to everyone. I recently started using HyperLynx from Mentor and I'm having difficulties in analyzing the signal-integrity of the signals due to having switches in the circuit. When I load ...
1
vote
1answer
151 views

Is this 0.4mm pitch BGA fanout OK?

I have not used any BGA packages before, but (lucky for me) my first one is a 0.5mm pitch device. Since the pitch is so fine, there is no room for vias between the pads, even at the smallest drill ...
1
vote
1answer
285 views

GND connections and ground plane routing?

When I let Altium do autorouting and then I define a ground plane using a polygon connected to my ground pin, I often get layouts where a GND line is flanked on both sides by the GND polygon, and then ...
0
votes
1answer
72 views

Does it matter how I cross a 2 MHz SPI clock signal on a two layer board?

Background Currently I am working on a breakout board which allows me to connect a number of external boards (analog and mixed signal) to an Arduino Micro, using a variety of connectors. The ...
0
votes
1answer
35 views

Room lines stills on my pcb and the top layers tracks are not displayed in 3D view, Altium

The fact is that I have routed. I would like to know how to proceed when this kind of thing happens when using altium. The routed tracks can be seen perfectly in 2D view. But when click 3D view I can ...
0
votes
1answer
215 views

Differential Pair Reference Plane Coupling

I am routing LVDS pair on a flex board. The signal is 264MHz. I used Saturn PCB design to calculate width and spacing between conductors. The targeted impedance for diff pair is 100 ohms, which is ...
2
votes
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....
1
vote
0answers
28 views

Altium: Stitching vias applying for multiple nets in multiple channels

I'm tryint to add stitching vias to my multichannel project. I have 5 nets for via stitching to be applied on each channel and 3 channels in the project. So 15 nets in total. Looks not too much to ...
1
vote
0answers
346 views

Routing through no connect pins in Altium?

I have an 0.5mm pitch BGA part I'm trying to route in Altium. The datasheet specifically calls out a number of balls on the part as having "no internal connection" and I've seen at least one ...
1
vote
0answers
67 views

BGA escape routing, understanding Altera app note

I'm trying to understand Altera's Application Note 114 "Designing with High-Density BGA Packages for Altera Devices". Specifically, I'm puzzled by the examples on page 19. The "through vias" example ...
0
votes
0answers
22 views

Unrouted Nets Error in Altium 18!

So, I use Altium 18 and I was checking the Board information for my PCB. Under Nets, it showed total of 24 Nets and 0 Unrouted Nets. During my checks I found one of the nets was unconnected, yet the ...
0
votes
0answers
51 views

Altium Designer: Copy room format does not modify polygon net name

I have a multichannel PCB with channels named U1, U2 and U3. I'm trying to copy the format of one channel to other two: component placement, routing, polygons. In the first place I was facing that ...
0
votes
0answers
78 views

4 Layer board with high current return path inner layer

So I am doing a layout for a 4 layer PCB 1 ounce/layer. The Chip supports up to 20A (motor controller driver). The application needs about 12 amps max ( I plan it let it go up to 17A in the event of ...
0
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0answers
29 views

Can 8051's ALE pin be equivalent to ground?

I want to add another port to the 8051 and I plan to do so by connecting port 2 (pins 21 - 28 of the 8051) to the Q inputs (pins 2 - 9) of an edge-triggered latch (74HC574). I will also connect the ...
0
votes
0answers
40 views

Why are my traces in eagle highlighted after I moved a component?

Good day, I am currently working on a PCB in Autodesk Eagle and was almost done routing when I had to move a component and now I have all these traces that are highlighted with lines and I don't know ...
0
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0answers
75 views

Lab power supply board review

I'm building "lab" (read: regulated) power supply. I've routed the board and I'm thinking if it has any chance to work. Here are schematics. The board: My main concerns: IC3 is ST1S14 - used here ...
0
votes
0answers
360 views

PCB grounds either side of common mode choke

I'm modding an old PCB that was put together long before I arrived here and I'd like some thoughts on what I think is a completely useless set-up where a separate comms ground has been routed ...