Questions tagged [layout]

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

Filter by
Sorted by
Tagged with
2
votes
1answer
70 views

How to place two inductors on the pcb? Which is better: example A, B or C?

I'm making a single phase pwm rectifier as my final year project. General topology consist of an inductor that connects ac voltage source with an inverter, as in the picture below: But since this is ...
0
votes
0answers
62 views

Microcontroller Oscillator Layout for ESD immunity

I have a small portable USB device failing ESD immunity. It's a two layer board with a solid ground plane on the bottom. I have diode protected inputs, and there's a TVS on the USB connector, and I'm ...
0
votes
0answers
20 views

LED driver logic, analog & power grounds & signal integrity

I am using a TLC920 LED driver and it has three ground pins: Logic, Analog and LED. What are some best practices for a layout with these? All three with be joined somewhere and my understanding is ...
0
votes
0answers
11 views

Poly density issues in differential pair layout

I have designed layout for differential pair in 10*10um2 of area. I have used dummies and guard ring around the differential pair to avoid PVT variation. here while running the DRC(Design Rule Check)...
2
votes
2answers
100 views

Why won't zones flood into vias or other plated through holes that are part of a footprint in Ki-CAD

I am using KI-CAD. Visible in the picture is a GND_USB plane (yellow) on layer 2, and also the top layer (red). I have a QFN package with an exposed pad in the center. For some reason the ground ...
0
votes
0answers
65 views

Bluetooth module PCB layout

On my PCB, I have the Bluetooth module (ANNA-B112) on the top layer. Due to space constraints, I had to put some components on the Bottom layer of the PCB beneath the Bluetooth module. The main ...
0
votes
1answer
83 views

Why do MoM capacitors need bulk connection?

In recent am doing layout of crtmom in 180nm technology node. I found the bulk connection to MOM capacitor. I dont understand the why MOM cap need bulk connection or bulk terminal in design. usually ...
0
votes
0answers
33 views

Purpose/Difficulties of having a common mode choke

This question is related to common mode choke. I know I have asked this question a couple of times in this forum and I have also read related questions and answers. But I am not able to get the total ...
0
votes
1answer
23 views

Net name requirement for PCB design on upverter

I am using Upverter to do my PCB design. Whenever I have 3 or more connections on a net, it shows me a warning saying that I need to explicitly name it. I would like to know if this is just a quirk ...
1
vote
2answers
127 views

SMA connectors minimum distance on PCB

I am designing a board, which will have several SMA connectors. I am mainly concerned about the minimum distance between SMA connectors on the board, since we need also account for the size of the ...
1
vote
3answers
154 views

High Speed Signals PCB guidelines [closed]

How quick does a signal have to be in order to be considered a high-speed signal? What are the limits and threshold where you can get away without special PCB layout?
0
votes
0answers
20 views

xpedition designer

I am here to clarify regarding on schematic creation using mentor xpedition designer,I finished my schematic drawing using xpedition dx designer so now i want to take my work another level(layout) for ...
1
vote
1answer
22 views

Allegro padstack not showing my pads

I have implemented a schematic for an IC (BGM13S32F512GA-V2R) and I am trying to create a footprint but when I try to place the padstacks, they do not appear in the default library... so I went into ...
3
votes
5answers
1k views

How should chips with pins on bottom be drawn?

When you are drawing a schematic for an IC, and there are pins in the bottom center (in my case I am drawing for the BGM13S32F512GA-V2R), how should they be drawn? I have looked into some beginner ...
1
vote
2answers
76 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 ...
1
vote
1answer
141 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 ...
0
votes
1answer
33 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) ...
2
votes
2answers
101 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 (...
1
vote
2answers
110 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 ...
0
votes
1answer
67 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 ...
0
votes
0answers
48 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 ...
2
votes
1answer
114 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 ...
0
votes
1answer
87 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 ...
2
votes
1answer
69 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 ...
9
votes
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. ...
1
vote
1answer
76 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. ...
2
votes
0answers
150 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. ...
0
votes
3answers
100 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?
0
votes
1answer
52 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 ...
0
votes
1answer
121 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 ...
1
vote
1answer
100 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?
0
votes
1answer
160 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 ...
2
votes
1answer
66 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 ...
7
votes
4answers
438 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
votes
2answers
82 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 ...
0
votes
2answers
159 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 ...
0
votes
1answer
126 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 ...
3
votes
2answers
162 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 ...
0
votes
1answer
81 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 ...
1
vote
2answers
83 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 ...
0
votes
0answers
44 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 ...
0
votes
0answers
88 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
votes
1answer
188 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
votes
2answers
57 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 ...
1
vote
0answers
45 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
votes
1answer
98 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-...
0
votes
1answer
45 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 ...
1
vote
2answers
160 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 ...
0
votes
2answers
75 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
vote
0answers
50 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 ...

1 2 3 4 5 10