High-speed design deals with designing circuits which are working at high frequencies where side-effects like path inductance gain significant influence.
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70 views
USB over FFC (flexible flat cable), where to place termination?
I have a design with a NXP LPC 4330 microcontroller using the USB port in high speed mode (acting as a mass storage controller). Due to the mechanical constraints of the system, the USB port must be ...
6
votes
1answer
114 views
How does this Logic Analyser front end work?
Hi I was reading on EEVBlog, some guy has reverse engineered the Logic Analyzer within the new Hantek MSO5102D MSO. I had a question about the front end part:
This is a 4-channel section of the ...
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0answers
35 views
Analysing Signal quality through pogo pins using Hyperlynx
I have successfully modeled Linesim and boardsim schematics for quite a few designs in the past and we have been able to do the required SI simulations. I had one question though: On one of our ...
2
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1answer
150 views
How exactly do all FPGAs work together on this board to carry out high speed calculations
The board I am referring to is called "Merrick 3" from "Enterpoint (ltd)". The web page can be found here: http://enterpoint.co.uk/products/asic-development-high-performance-computing/merrick-3/
I ...
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2answers
72 views
How does less cable impedance, source/termination impedance, lead to longer cable length for higher data rates?
This question is about high speed digital transmission on a transmission line,
I need to know about how does the
(1) impedance of the transmission line and the
(2) source impedance and
(3) ...
3
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2answers
116 views
Ground vias on high speed PCBs
I know that if I use vias on high speed traces that I need to reduce the inductance effect of the via. So I will put ground vias next to these vias to help returning current. I have seen a picture ...
2
votes
1answer
165 views
Implementing a very high frame rate (~1Khz) OLED display
I'm interested in developing a very high frame rate OLED display capable of displaying ~1000fps with a resolution of around 1200x800 or so. This obviously has some pretty severe bandwidth ...
5
votes
3answers
204 views
Has anyone transmitted data across a badly coupled transformer and recovered the data correctly
EDITED June 9th 2013 to give more detail (hopefully)
I've recently set-up a data transmission system on a rotating machine. The data was collected and serialized from several ADCs connected to strain ...
5
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3answers
507 views
PIC problem: Touching the crystal capacitor makes the system slows down
I am experiencing a very unusual problem (at least for me). When I touch with my fingers, or the oscilloscope probes, on the crystal or it's capacitors, the PIC runs slower...and A LOT slower then it ...
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2answers
168 views
ARM (Cortex-A8) High Speed Bus?
I need to communicate from FPGA to ARM with about 16GBits/s...
Is there a Bus which I can use? Or how to solve this problem?
The FPGA receives data over LVDS. This data schould be post-processed in ...
5
votes
2answers
118 views
Can I slow a CMOS output through an RC filter?
Is it good practice to slow down the slew rate of a CMOS output by putting an RC filter on it? What happens with impedance matching after I do this? Or can I just set the RC filter with such a low ...
2
votes
4answers
191 views
Boundary scan - High speed interfaces
I was given the task to evaluate existing boundary scan systems. At this moment, we are using a simple solution which allows us to define boundary scan vectors which we can check. This is fine for ...
2
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4answers
311 views
USB differential pair length
I am routing a PCB that uses a USB connection. The differential pair traces are 10 mil distant from each other, and they are about 1mm different in length. Is it going to be a problem? What is the ...
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vote
2answers
162 views
How should we account for the length of series termination resistors for length matching?
In some cases, we need to length match several different nets between two ICs, based on the specifications of the driving or receiving IC. Sometimes, some of these nets have a series termination ...
6
votes
3answers
540 views
Question about trace length matching patterns for high speed signals
A colleague and I had a discussion and a disagreement about the different ways high speed signals can be length-matched. We were going with an example of a DDR3 layout.
All the signals in the ...
4
votes
2answers
328 views
3.2 Gb/s high speed interface over 50m: copper, fiber, other ideas?
I need to run a 3.2 Gb/s interface over 50m. My client is keen on Cat6e. The lower the price, the better. These are my findings so far:
I'm looking at using a Spartan 6 GTP Tranceiver with copper ...
2
votes
1answer
598 views
2-layer USB 2.0 High-Speed routing
First off:
This is for a one-off (or two-off) hobby project, nothing more serious. If this were a commercial design, I would go 4-layer at once (though I wouldn't be designing such a project in the ...
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0answers
112 views
Hyperlynx Boardsim for multiboard design
I have used 'linesim' in hyperlynx before for evaluating PCIe and other high speed devices using respective IBIS models.
However, for our new project, we have a system where say 'Board 1' has a SOC ...
9
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4answers
519 views
Lengthening a 5 ns pulse
I have a 5 ns pulse width High coming out of a comparator that is asynchronous. I am attempting to count this pulse. My current microcontroller (dsPIC33FJ) has an asynchronous counter on board, ...
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votes
1answer
134 views
design of a parallel analogue to digital converter for high speed sampling [closed]
i am to design a parallel analog to digital converter, please can someone help verify for me if i can use a PIC for this design also what application can this be used for?
i am not that good with ...
2
votes
2answers
425 views
Maximum input frequency of 74HC Logic gates
I have a clock that is running at 25.175MHz I want to run that signal through some basic logic gates from the 74HC series.
I have looked on the datasheet for the 74HC08 (AND Gate), I can't seem to ...
1
vote
1answer
430 views
Does the TI CC2540 support Bluetooth High Speed protocol?
The Bluetooth High Speed (HS) protocol is included in the Bluetooth 4.0 spec, but I can't find whether or not standard Bluetooth 4.0 modules such as the TI CC2540 support the high speed part of the ...
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3answers
155 views
Ultra high bandwidth serial data stream
I have a ultra high bandwidth data stream (USB 2.0 Highspeed), on which I need to add an header for synchronization. This needs to be done, since the datastream needs to be transmitted wireless on a ...
0
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2answers
194 views
Cheap high speed oscillator [closed]
What is the fastest oscillator I can build for less than $1 in parts ?
Further specifications:
SMT only
Pricing for Quantity 1000
Stable frequency
Sine wave preferable
I don't care too much what ...
8
votes
1answer
304 views
What is ground bounce?
From David's comment to this answer I understand that it's an undesirable effect in high speed designs. Can someone explain in detail?
