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Maverickmax,
There are many resources available online through various power semi-conductor and micro-controller MFGs in their "Applications Notes" such as those found here:
hxxp://www.irf.com/product-info/imotion/sensorless.html
(replace the hxxp: with http: don't remember the rules on live...
spartan ii vs spartan iii
Ok, I have searched the archives and I can’t seem to find much discussion about the advantages/disadvantages of the Xilinx Spartan-II vs the Spartan-3. I have read through the documentation of both devices and am left a bit more confused than when I started. I will...
FPGA Clock Generation
Echo47, Yeewang,
Thank you both for your input. Jitter is a concern particularly in the upper frequencies. The ADCs have a clock output that can be used to drive the FPGA so I will go with something like the MC12429 directly to the ADCs.
If anyone is familiar with a...
FPGA Clock Generation
I am working on an FPGA based DSO project. I would like some input on the FPGA/ADC clock. The project utilizes 2 ADCs capable of up to 250MSPS (Maxim 1121s) and I plan on using a Xilinx Spartan FPGA. For acquisition there needs to be several timebases. These include...
AC And DC image
I assume you simply want a series of digital samples representing the dV/dt wave forms? Regardless of what you want to do with these samples the answer is an ADC. Depending on what you want to do with these samples, the ADC can be a discrete IC, a feature of a microcontroller...
I have a Lecroy 9450A (9400A series) DSO that is failing its POST. I have an operators manual, but a Service manual (Lecroy part number SM9400A) would greatly facilitate the repair process. Lecroy does not archive this service manual, and I have been unable to locate a copy. The error is...
mesalem,
Are you asking for help, or are you asking for someone to design this circuit for you? It sounds like you may be in over your head. I would suggest starting with an OpAmp (a 741), and a Flip/Flop (74HC74 or similar) and a pair of LEDs. First breadboard a circuit that will "trip" the...
A lot depends on the anticipated time from peak to peak, and the format you want it in. If the time domain is fairly predictable, and you want a digital output, then I would suggest using a fixed clock, an op amp, a pair of flipflops, a couple of 8 bit counters, and a schmitt triggered nands...
DSO PC Interface
I assume active links to other pages in this forum are acceptable, if not, please inform me and I will kill the link. I do not know how I missed this very good thread, but wanted to point anyone who finds this thread and wants more info to not make the same mistake I did...
DSO PC Interface
goshka,
Again thank you for taking the time to comment on my project. I have considered using an FPGA for this project, but had thought it might be overkill. I have never worked with FPGAs, but have wanted to for quite some time, and so I will take the oportunity to explore...
4n33 optocoupler
well, my skills with a text editor are just not up to the task at hand, but if you will consider the following spec sheet I think you might find an easier cicuit:
h**p://www.irf.com/product-info/datasheets/data/ircz24.pdf
These devices are designed with you purpose in mind.
How to link a ADC to a DSP unit ?
kseng2002,
What frequency domain are you interested in? It appears from your ADC selection that you are interested in 8 bit resolution audio frequency. If I might suggest, you can achieve this quite easily with your PC's sound card. Simply "record" your...
I certainly do not have an indepth knowledge of this system, but a google search turns up a lot of info. This link looked particulary informative:
h**p://gransasso.dspvlsi.uniroma2.it/pubs/iscas01a/iscas01a.html
I hope this helps.
How to link a ADC to a DSP unit ?
I am working on an ADC project as well. It appears that you may need to give a little more information before anyone can help you. A lot depends on the type of ADC and the type of Digital Signal Processor you are using, and what your ultimate goal is. In my...
DSO PC Interface
goshka,
Thank you for your response. What I would like to do is build the DSO as an external box that can buffer the data independant of the PC and then send the buffered data to the PC via a standard comm protocol. My idea was to use commercially available PC100 SRAM...
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