How many channels do you need?
I have done sampling of RF at 900 MHz. I sampled I and Q of the
signal after it was demodulated from the carrier and sent through a
mixer to produce separate I and Q channels.
Do you need two channels? One for I and one for Q?
Also, since your carrier is 1 GHz and your IF 10 MHz there is a
mod/demod stage between your 1 GHz RF and your 10 MHz IF. It is not all
done at a 'digital level'. The mod/demod of your IF is all digital.
Your answer to the I and Q question will determine the type of ADC you
need.
- Kal Atwal.
> Again ...our application is not the traditional analog ones as u think....we
> do digitize the whole band and do the mod/demod at the digital level....
> 1. Physical parameter...?? Say a wideband signal centred at 1Gc.....(10Mhz
> bandwidth...)...to be more specific let it be a wideband CDMA signal....
> 2. If I say 20Msps at 10 bits....I hope u understand...how often...
> 3. We have a dsp testbed here with an A/D which takes max 1 to -1V
> inputs....at 10 bit resolution this means the no : of significant digits is
> 3...that will be fine for us....
> Look forward to ur reply......,
> thanx,
> Jithesh...
> Kulwinder Atwal wrote:
>
> > Obviously, you have not done data acquisition before. It is meaningless
> > to talk about sampling rates without stating the desired resolution. It
> > is like talking about velocity in terms of direction alone. I have
> > worked on research projects requiring real time A/D and none of them
> > have used the lowest resolution. Further, there is the SINAD of the
> > analog front end to consider when calculating 'true' resolution. Many
> > solutions exist to meet your needs. To provide you with an optimal
> > solution I need to know the following:
> >
> > What is the physical parameter being measured?
> >
> > How often does it need to be measured?
> >
> > How many significant digits are required?
> >
> > - Kal Atwal.
> >
> > Jithesh Kizhakkekkara wrote:
> > >
> > > Hi,
> > > Iam working on a research project which requires real time data
> > > acquisition of the order of 20Mega samples /sec.... To be more specific
> > > I would like to know whether there are any LINUX drivers written to date
> > > for PCI based A/D cards of speeds above 20Msps... I will be extremely
> > > grateful if any body could give pointers to some product which is
> > > existing or some work happening in this domain...
> > > The max speed of the A/D for which a linux driver exists, I could
> > > spot out was around 2 Msps...
> > >
> > > thanx in advance,
> > > Jithesh....
> > >
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