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67 Threads found on edaboard.com: Differential Route
Can you please tell me how to route the differential pairs in ANY ANGLE in Expedition PCB?
First you have to assign the not nets or xnets as differential pairs. Specify clearly the trace length & track to track spacing. In case you are not able to get this. try to run the pairs to be routed parallel from source to destinatio (this mentod is not recomended.)
Hi there, This is my first time doing a differential pair layout, and I am hoping to gain some helpful pointers. My partially complete differential pair is shown in the attachment (screenshot). I am using Cadence Virtuoso. My transistors are W/L = 56um/4um. I am using the 2D structure dAsBdBsAd dBsAdAsBd where d = drain, s= source, and
Hi, I am designing a fully differential amplifier with capacitive feedback with a 32:1 capacitor ratio. I need the capacitors in common centroid. In addition each of the two signal paths should be the same. I have attached a picture of what I think the geometry should be. To get common centroid, I have made the unit caps = 2 x smaller unit caps.
Hi all, Can anyone tell me how to route differential pair(with 10mil, spacing 5mil) in PADS 2007? Thanks, Demigod+
Hi I am trying to route some differential pair signals using the tools in Altium Designer. However when I start to route the tracks a message comes up saying there are rule errors on all layers and will not let me route the tracks. How do I find out where these violations are in the design? Thanks Jon
The first place to check is the differential pair design rule itself. You'll find it in 'Design>Rules>Routing>differential Pairs Routing'. You need to have the minimum, preferred, and maximum gaps set for each layer, as well as the maximum uncoupled length. If this rule isn't properly set up, the software won't be able to establish the proper se
Hi all, Some times when i use blaze router for differential pair it doesen't allow me to route as a allows only as a single ended traces. THis will happend only for few nets.Eventhough I assigned them as differential pair nets i couldn't able to take as a pair. Regards, Monolisa
Hi all, In Allegro, we can calculate the differential impedance using differential Impedance calculator and give constraints and route them. But is there anyway to confirm that, these differential signals are now having the required impedance after routing the traces. pls help sandhya
On Semiconductor is the leader for ECL and PECL components. They took over the product line formerly run by Motorola. Go to and search for PECL. You will find numerous design guides. You can fanout PECL. However, the routing must be daisy-chained with the termination resistors at the far end. Most common mistakes
I am new to Orcad Layout plus,and am designing board for Ethernet. Is there any Consideration to route differential Pairs. and what are the steps has to be considered for routing.Maximum speed of my Ethernet board is 10MBPS Regards Rajan.K
hi the differential pair routing will help in cancelling out noise impact. so, even if it is analog signal we can use differential pair. i.e., the reason why we usually route the inputs of an op-amp as differential pair. hope this info. helps Regards
Hi, How to route the speaker interface signal in PCB.Whether i have to route as differential pair or i can go with ordinary signal routing(Signals named as +ve and -ve). help me to do better Regards Rajan.K
Hi,everyone: I use Virtex5 and ISE10.1. I connect one chip’s single ended clock to the N-side of clock capable pins of Virtex5 FPGA by accident on my PCB board. But Xilinx’s manual demands :“1)Do not connect a single ended clock to the N-side of the differential clock pair of pins, for example IO_L3N_GC_3. 2
While trying to create differential pair of signals using route flip chip signal ,I fill the advanced options form and in that I select "Named" nets under that.But when I enter the nae of the name of the nets,it says cannot find "those particular" nets in design.then **No net has been selected.Could someone help me with this?
yes..you can route signal in power layers too. remove power shapes from certain areas and route the signals. But make sure you have at-least one reference plane for all the signals routed in different layers of the board including the signals in power planes. This is to maintain the single ended impedance of (...)
Hi Everyone, Are there any design constraints to route differential signals in ORCAD?Please some one help. Regards DB
Hi All, I am new to this membership. i am very glad to see the comments in this website. I too have some doubts, kindly give comments. I am using ARES PCB designer, when I try to route a differential pair there was no option I noticed. Is it possible to do differential pair routing in ARES PCB Design? Is there any way to do it? Can (...)
Hello, I am interested in how to find a good way to route differential pairs in the internal layers. This normally is a good idea except the fact now you have 2 reference planes, in which most tools can not calculate this b/c they are not set up to. Example is using the Saturn PCB toolkit to calculate differential pair calculations. It (...)
Is there a autoroute function for differential traces on CADSTAR?
Apart from it's DC bias function, the ethernet magnetics mainly provides common mode isolation. Both sides are 100 ohms differential transmission lines. Impedance matching wise, the magnetics are almost transparent. There are two simple conclusions: - the on-board part should be good 100 ohm matched differential pairs. The overall losses aren't
In my project,differential signals are input to my FPGA,the output is single.Can I make use of LVDS pins to tap this issue.?
Not sure what your question is. Are you asking how to route differential pairs?
Hi, Here are my suggestions to route ethernet signals. I assume the interface speed is 100Mbps: 1. Keep the distance between PHY chip and Ethernet Transformer (magnetics) as short as possible. 2. route the RX+, RX-, TX+ and TX- differential pairs as 100ohm differential characteristic impedance. You can use Saturn PCB tool (...)
He swears by a Cadence product that lets him manually simultaneously route the two differential lines with automatic spacing between them and equal lengths. Actually, in Mentor Graphics (formerly Innoveda) PowerPCB also have this option (High Speed Design) in thier package. very useful especially during manual routing wi
1)How to perform the group routing,because my PCB work contains so many buses,I want to route these buses as same length as possible. 2)My PCB contains many differential lines,how to route these differential lines in the same length? I kown that there is a setting in PowerPCB to set the differential (...)
The main sources of a non-ideality for SA ADC are an offset voltage of comparator, a non-ideality of the elements, which make up the DAC (mismatching of capacitors or (and) resistors, non-ideality of switches). To reject the noise from substrate and power supply use the fully differential architecture. Typicaly SA ADC are suitable up to 12 bi
Yes, u can. firstly, if the 2 i/o standard use same vccio voltage, they can exsit in same bank. secondly, some input buffer and some differential tandards can be in one bank even if they have different VCCIO. In short, if your assignment can pass 'I/O assignment analysis', you can configure it. Therefore, if I want to
I come from an OrCAD and SPECCTRA background and am at the moment seriously considering other SW options for our complex designs. Can users please help me with their valuable input on which tools will suite my needs best. Any comments will be welcome and I don?t expect all users to know the best answers to all my questions. I?m sure some of these q
Hi guys, If your input signal is LVTTL for example: - connected to pin A1 in Bank 1 (for example) you have to write some HDL to route it to another bank, simple instantiation of your LVDS standard output (search in the library) for example (X!linx) OBUF_LVDS OBUFT_LVDS ... the input to this module will be your LVTTL input and th
Here is the schematic of an ATX PSU: As you can see there is a feedback path from the +5V and +12v outputs - maybe you could modify your supply and route them to your load instead. Use shielded wires. If the electrical noise level is very high you might need to build a differential sense circuit o
Honestly best layouot tool I have seen is Pulsic. a) if you need something they code it for you - always adding new and improving existing. Really clever guys b) can handle differential lines etc. c) it has quite good auto place Well, yo for sure have to learn to use it. But I love it.
sometimes must be using autorout tools,such as contrained trace or trace gourp(differential line.......) the mentor's autorouter is better
Hey, you may want to have 8 layer PCB..... as differential signal routing constraints be met... but i don't know complexity of your card.... if it is kind of related to gaming....they you may want to go for 8 layers....
By default the length of any interconenct on a pcb should be as short as possible. route the differential signals close to one another and match their length with least tolerance possible. There is no specific standard for the length of differential signals used on back planes.
High Speed PCB High Speed PCB Design Ride the Wave Workshop 58 pages presentation Post route Analysis of a High Post route Analysis of a High Speed PCB Design Speed PCB Design Design/Analysis for Power Delivery System (PDS) Goals for this Presentation ? Show the integration between Allegro and PCB/MCM ? Show mixed 2D and 3D
Some suggestions: 1. Use striplines whenever possible. 2. Keep clocks and other high-frequency signals at least one-tenth of an inch away from I/O signals and connectors. 3. route differential pairs together, so their lengths are matched and any common-mode noise is cancelled out. 4. Watch out for high current traces, make sure they don't f
Hi, You cannot use differential pairs in Layout. You can use them only in Capture. The netlist dosn't carry to Layout the information needed. Probably it is possible to work with differntial pairs in Allegro.
more important, keep your signal flowing smoothly and make your circuits more symmetric, especially your differential pairs and related circuitry. if you are running some important signal over a ground plane, take care of that additional caps. better you simulate it.
connector vendor will specify how far back from pcb. or Mechanical designer will specify. route as differential traces at matched length.
If you have other digital (high speed) wires near your DVI differential pairs then you have to shield them by GND! If your DVI differential pairs not have any digital wire near them then shield is not important! Important ? uniform along the critical wires!
hi. if i want to route differential pairs with altium, it stucks too often. For example it routes 1cm, then it stucks, and doesnt want to continue. even if the length matching is loose. Sometimes i want to route 3mm but it tries to route 1cm and because there is a component 7mm away, it stucks, and (...)
Hi, I have a few queries regarding differential pairs: 1- In differential pairs,we need to route the nets parallel.Since we can not route the nets 100% differential i.e.we can not make route 100% parallel due to the placement and pin gaps of the question is the minimum % (...)
hi guys i am new to pcb routing. can anyone pls tell me some guidlines to follow while routing data bus, clock and high speed signals..... i know that data bus, differential signals, address bus have to be of same length from the point of timing... i am trying to equalize nets in altium designer. the pin out of the devices makes it bit difficult
Common Mode and Interdigitization is basically just a method of layout of devices. The basic idea is to distribute the devices so that they are more spread out across the design. It is relevant for matching of devices. Say you are laying out a differential amp. Properly designed, main cause of mismatch would be due to layout of the
Hi, In DDR2 routing, u have to 3 types of lines Databyte lanes Address and command lines Clock lines Each databyte lane include 8 databits(DQ0:7), 1 DataMask(DM0), 1 Data strobe(DQS0). For a single byte lane, u should consider DQS as the clock and route them with 100mils tolerant length matching. like wise, u do for all the bytelanes.
In my design there are some differential pairs with ARC routing to be matched exactly.If so how could I do it by using PADS software. Almost more than 50 pairs to be matched exactly with ARC there any alternate way to acheive this.
If you are mounting a silicon tuner onto the main PCB you will need to let us know what frequencies it will cover and what PCB materials and stackup will be used. Dropping thickness between route layer and gnd plane will reduce track widths, but you should try and do this around a core instead of pre-preg as it is easier to control the seperatio
Yes You can route differential signalsin altium. there is DRC set where you have to define DP and then you can route them
I did layout for ethernet.....Consider the signals as differential pairs and route the signals as per the imp., u default 5 mils trace width and 10 mils spacing and terminate at the destination.Better route the high frequency signals on the inner layer and provide the proper reference plane to maintain the imp., Regards Rajan.K