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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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2answers
65 views

How can I reduce noise caused by shift register updates?

I have a couple of designs using 74HC595BQ-Q100,115 shift registers. Some are using the SO-16 package, some the DHVQFN16. Some have five shift registers, some have three. ALL have a significant ...
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1answer
35 views

Altium error: “Could not find closed shape” when creating region from primitives

I have imported a dxf onto mechanical layers, and want to use this to create the pads for a component footprint. My approach is to select the whole outline of the would-be-pad on the mechanical ...
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1answer
31 views

ZigBee end-device could not connect to Coordinator

I'm using Atmel's ATMEGA256RFR2 (link) for Zigbee (802.15.4). I needed to redesign the antenna part because with the previous design it did not produce good range. Here is my other (answered) ...
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2answers
96 views

Best way of switching between different resistor/capacitor values in a layout?

In my project I would like to switch between different resistors/capacitors on the fly, preferably without having to open the containing box around the PCB. Therefore, one idea was to use a jumper (...
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2answers
100 views

How can I layout these regulators to minimize board size and EMI?

I have three switching regulators. A 12V, 5V(green box), and 48V(purple box). The plan is to supply both regulators through -/+12vout pours. If I am trying to minimize board size while also ...
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1answer
57 views

Component case size and spacing for ESD protection circuit

As im searching for TVS diodes, I see a 30KV rated diode array has pins RIGHT next to each other. Aren't they so close that a spark can easily jump between pins?? I read a few time that you need a ...
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0answers
38 views

RF sampling ADCs(ADC12DJ3200 ),PLLS and regulators placement and layout

I am novice in PCB component placement and layout. I have just started my career in Hardware design. We have designed a schematic for Data Acquisition System. In our design, we are using three RF ...
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1answer
82 views

Are input filters always required for switching power supplies?

This is a follow up to the questions here and here I recently designed a PCB that contained a buck regulator (LM2576 5V). You can see the PCB layout in this question. After converting the input 12VDC ...
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1answer
57 views

Question about PCI-E gold finger fanout

I'm planning a PCB project with PCI-E connector. After looking some docs about PCI-E. I find one problem about the fanout the PCI-E gold fingers, the X16 pinout defines as below (part of whole 164 ...
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1answer
66 views

Is it possible to manufactrure a stencil for this paste-mask using the usual stencil making methods?

I have this footprint from the KI-CAD footprint library (LFCSP-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm_ThermalVias). The paste-mask shows several circular paste areas under the thermal pad. The separation ...
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3answers
2k views

Design of 50 ohms RF trace for 2.4GHz…Double layer FR-4 PCB

I will use a 2.4GHz transceiver on my new project. The PCB material will be FR-4 with 1.6mm thickness and the connector is a SMA. My doubt is about the RF trace that should have 50 ohms impedance. ...
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1answer
46 views

Altium - Invisible unrouted nets/components?

I've got a design in Altium and while routing, I moved a few resistors. They somehow accidentally got deleted and wouldn't undelete. I brought them back with an ECO, and placed them where I want them. ...
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0answers
78 views

GSM noise from a 2-layer PCB with SIM800C

I've designed a 2-layer PCB that contains a 12-5V buck converter (P2576L-50 - a Clone of the LM2576), 3.3 (AP1117-33) and 4V (MIC29302WU) shunt regulators, an STM32 micro and a SIM800C GSM module. ...
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82 views

Capacitor IC layout

What is the reason behind this connection of the plates of capacitors in layout? Why is one of the plates was formed by 2 metal layers?
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1answer
45 views

capacitor layout

I have this passage from a Mr Maloberti related to the topic of Layout of Capacitors and I don't know how to interpret it: The second-order effect must be taken into accout when precise capacitors ...
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1answer
116 views

High Voltage on PCBs: design and layout questions

I am designing a PCB that has high voltage (DC) on it. It will be located on a CubeSat (so, space). The PCB (HV-PCB) will receive the HV (3 kV max) from a DC-DC converter through a Coax cable; the ...
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1answer
69 views

NMOS transistor in layout [closed]

Can somebody please describe the way that NMOS transistor layers: DIFF POLY1 NIMP PIMP are related to the cross section of it?
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1answer
38 views

Placement of varistor with respect to fuse

My design includes a pretty standard AC/DC converter powered by mains for intended use at home. For overvoltage and overcurrent protection, I am planning to use a combination of varistor and fuse ...
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1answer
63 views

ADC signal close to D+/D- signals layout suggestion

My circuit is laid out in way so that the analog front end is on a different pcb than the MCU board. The two PCBs are connected with a vertical connector of which 4 pins are used to transfer two low ...
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3answers
232 views

Which is the preferred approach to PCB layout for signal vs power traces in analog circuits, and things to consider?

I have had to layout 2 layer PCBs several times now for analog signals, and am just beginning to learn the process. I often face a similar question in one form or another with regard to laying out ...
2
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2answers
72 views

SOIC-8 IC input pins small spacing at high voltage

I'm looking at a high common mode voltage difference amp (AD629). The input voltage between the two input pins next to each other will be 150VDC. Normally the pads should be bigger on the PCB than the ...
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2answers
150 views

What tool produces this type of layout?

I don't under this layout figure (5.c) in pic attached. This is a screenshot from research paper in this link:- https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7573442 Alternate link for the ...
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1answer
73 views

Does anybody have PCIe (3.0) aka PCI Express module card edge connector technical drawing? [duplicate]

I was searching through the internet to find PCI Express card edge connector footprints / technical drawings / pin spacing / layout of the module cards that you stick in these connectors you can find ...
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2answers
121 views

How to design a CMC (Common Mode Choke) footprint to allow no-pop solution

How would you design in CMC's with a 0504 (1210 metric) 4-lead package to allow for a no populate (do not pop, DNP,DNI) solution? I am thinking 0402 0ohm (zero ohm) resistor but cannot picture the ...
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1answer
56 views

Is it feasible to manually draw from scratch a 2-layer PCB inside HFSS

I am trying to replicate a new planar marchand balun Is it feasible to manually draw from scratch a 2-layer PCB inside HFSS ? Or should I use external PCB drawing tool such as Kicad or Altium, then ...
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2answers
66 views

Guidance on the use of pins of LM1117

I plan on using this 3.3v regulator It has 4 pins on the SOT-223 package I plan on doing the following ( but want to check ) Pin 1 - Gnd Pin 2 - Vout - 3.3v -- Tied to pin 4 feeding my circuit Pin ...
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0answers
33 views

Pi Filter Design / Realization with 915MHz u.Fl

I'm putting a u.Fl connector into a new LoRaWAN design (915MHz). Apologies ahead of time if the scope of my questions are too wide for one post, but I think it's all closely related. I'm going to ...
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0answers
65 views

DC/DC Buck Converter PCB Layout Help

Most examples I find are for buck converters on a PCB of their own with massive traces. I want to make sure this layout is fine with the planes I'm using(both top and bottom copper pour layers are GND)...
3
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1answer
166 views

Zigbee PCB layout - bad signal reception

I'm using Atmel's ATMEGA256RFR2 (link) for Zigbee (802.15.4). However I could not reach more than a few meters of range between my nodes. Here is the antenna design layout and schematics I'm using, ...
0
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2answers
47 views

Antenna mounting confusion from Datasheet

I ordered a few samples of a particular antenna, because of the datasheet showed a rather peculiar layout - so I wanted to see what the actual component is and how it performs. Antenna is Abracon's ...
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0answers
42 views

analog and digital ground connection point selection

I've read some articles that say the connection point of digital ground and analog ground should be at the power supply output port. However, when there are two or more power supplies which are ...
0
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1answer
58 views

AC power tracks, PCB design guides

I was wondering about this board Im reviewing. Theres a switching power supply module in this board (red rectangle). switching power supply used: https://pt.aliexpress.com/item/220-v-a-3-3-v-5-9-12-...
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1answer
42 views

SMT electret microhone PCB mounting [closed]

I see a lot of SMT microphones in vendors' lineups. All of them orient normal to the PCB--either up or down. I'm working on a design where the microphone has to point parallel to the PCB. On the ...
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2answers
101 views

How important is it to track from centre of pad in PCB routing?

When reading through the review comments of a PCB, there was one which raised some questions for me: "Aim to route tracks out of pad centres and in line with the pad, not exiting at an angle." I ...
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2answers
69 views

High current on PCB to through hole connector

If I have a though-hole connector with 3.5mm pin spacing and the manufacture rates it for 14 amps per contact, how am I supposed to safely carry anywhere near that current over the PCB? Specifically, ...
1
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0answers
37 views

Marchand balun layout

For this marchand balun schematics in ADS, how to instruct the ADS layout generator to use coil shape (for area saving in IC) ? Besides, anyone have any experience with planar layout of marchand ...
3
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1answer
52 views

how will a connector affect a transmission line?

I am laying out an RS485 driver and read a few design guides which recommend a 120 Ohm termination resistor. This makes sense since the characteristic impedance of twisted pair cables is in the 100 ...
2
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3answers
118 views

RF loop Antenna design layout

I am designing a bioimplantable circuit for a biomedical implant. The goal is to have an extremely tiny device in a flexible substrate (Dupont Pyralux) that must be powered wirelessly. My problem ...
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0answers
27 views

Highlighting feature of any net becomes latched on in Altium 17.1 PcbDocs

When routing a net, highlighting of startpoint/endpoints is great, but when a net I am no longer working on remains highlighted, it becomes an annoyance. This is happening multiple times a day and the ...
0
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1answer
124 views

Differential pairs; length matching between pairs

I'm currently busy routing a high speed design containing MIPI signals @ 2,5Gbit / lane to a connector on an 8 layer board. As MIPI also contains a clock pair, it is advisable to match the length ...
3
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0answers
63 views

7030 SMD LED pad configuration

I have not done a lot of work with SMD LEDs and have a question about the pad layout. I have done quite a bit of research and haven't found much helpful info yet. I am working with 7030 SMD LEDs ...
0
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1answer
39 views

Unlock movement/edit of internal polygon layers in altium 19?

I changed an internal plane to a signal layer and now I want to be able to move objects in this layers like polygon, however I seem to be unable to do so. How can I unlock polygon move/edit in this ...
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2answers
104 views

EAGLE Names not showing up on board after footprint update

I added the >NAME attribute to the footprint of a device and now the names are not shown on the board. I have already tried to update the library (with library --> update all) and also the replace ...
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2answers
164 views

PCB input smoothing capacitor layout

I got some 0.1uF ceramic capacitor in front of my mcu IO pins to smooth the inputs values/spikes I was wondering if this placement is bad or not because their position is "over" the input so maybe (...
1
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1answer
108 views

Compare (Diff) ODB++ Files

A few years ago I was making layout changes to a PCB and wanted to be 100% sure that one particular interface did not change at all. My layout contractor generated an ODB++ compare file (I would also ...
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1answer
45 views

how to confirm that PCB Ethernet layout does not affect perfornace

short version: - How to test if ethernet traces on PCB causing any distortions to the signal? - Is it possible to generate ethernet signals from a windows computer and measure them with an ...
1
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1answer
234 views

ESP-WROOM-32 layout USB-UART

I want my layout will include female headers to connect CP2102 MICRO USB to UART TTL Module 6Pin so I could just 'stick' it to my PCB while uploading the code. The 5V for the ESP will be supply from ...
4
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1answer
162 views

Ground planes disposition in Ethernet connection

I am designing a board that will have sensible analog signals and a processor communicating with the external word via Ethernet and I want to avoid that common mode currents couple into my analog ...
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0answers
37 views

Cheap RF 433.92MHz design, PCB track antenna [duplicate]

I'm doing a RF remote control project using a PCB with microcontroller and with simple onboard antenna layout as transmitter and a 433.92MHz receiver RWS-371F-6 model. Here is the datasheet of the ...
0
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1answer
64 views

On-PCB SPI Distance Considerations

I've been reading about ringing and overshooting and all sorts of things, but all without getting a real "feeling" for how likely these things are to affect my circuit. I've got a chip generating an ...