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?? sample rates more than 100kHz

Started by ravikiran_dn August 25, 2003
hi everybody,
i am not able to obtain a sampling rate more than 110 kHz
using MATLAB or BORLAND C++ 5. If I use more than 1 MHz sampling
rate, then more and more samples has the same value; getting a random
step waveform. If any body knows how to obtain higer sample rates of
the order of 1GHz, pls help me. If it is impossible to obtain that
much rates pls inform me abt the limitions of A-D converter/PC.



Ravikiran Dn-

> i am not able to obtain a sampling rate more than 110 kHz
> using MATLAB or BORLAND C++ 5. If I use more than 1 MHz sampling
> rate, then more and more samples has the same value; getting a random
> step waveform. If any body knows how to obtain higer sample rates of
> the order of 1GHz, pls help me. If it is impossible to obtain that
> much rates pls inform me abt the limitions of A-D converter/PC.

What data acq/DSP board are you using? The hardware and underlying
driver/library
makes all the difference.

Jeff Brower
system engineer
Signalogic



Ravikiran DN-

> I am just using my P4 pc with MIC as input. I am reading data
> with wavrecord. My original idea is to interface my TV cable directly
> to the computer using MATLAB. Atleast a sampling rate of 100MHz is
> necessary. Is it possible with my configuration? I am also ready to
> use assembly language to get it.

Well, a mic input is not good for more than 20 kHz or so bandwidth.

For 100 MHz sampling, I think you will need some type of plug-in video/imaging
card.
It's more of a hardware issue than software; that's a fast rate and you have
signal
integrity and noise issues to deal with, especially in a PC environment.

Maybe the Data Acquisition toolbox and TMW's supported hardware recommendations
would
be some things to look at.

Jeff Brower
system engineer
Signalogic

> ----------------------------------
> What data acq/DSP board are you using? The hardware and underlying
> driver/library
> makes all the difference.
>
> Jeff Brower
> system engineer
> Signalogic
>
> ----------------------------------
> Ravikiran Dn-
>
> i am not able to obtain a sampling rate more than 110 kHz
> using MATLAB or BORLAND C++ 5. If I use more than 1 MHz sampling
> rate, then more and more samples has the same value; getting a random
> step waveform. If any body knows how to obtain higer sample rates of
> the order of 1GHz, pls help me. If it is impossible to obtain that
> much rates pls inform me abt the limitions of A-D converter/PC.