NI PCI 5112 Bandwidth

[Anoop@NeST]

Hi,

I would like to use NI PCI 5112  for my project. My signal bandwidth is 10KHz to 40MHz.NI5112 data sheet specifies its bandwidth is 100MHz and sampling frequency is 100MHz.Is it possible to use this device for our application? For noise rejection Any antialiasing filter is used in its input?
if yes how it configure? what is its design criteria?
As per datasheet 2 aquisition modes are applicable  one is realitime with 100MSPS sampling frequency and other is 2.5GHz sapling rate. pls describe the diffrence in detail.



Message Edited by Anoop@NeST on 03-10-2008 01:24 AM

[Chris_D]

Hey Anoop@NeST,

The PCI-5112 should work fine for your application.

The 5112 does not have any anti-aliasing filters. It only has a low-pass 20MHz filter which is software selectable. This can be set with the niScope Configure Chan Characteristics VI.

The 100 MS/s specification is for the real-time sampling, while the 2.5 GS/s is for the Random Interleaved Sampling Rate (RIS).Please have a look at the NI High Speed Digitizers Help for more details on RIS and for much more information.

Equivalent-Time Sampling and Random Interleaved Sampling
http://zone.ni.com/reference/en-XX/help/370592G-01/digitizers/ris/

[Anoop@NeST]

Dear Chris,

Thanks for your immediate response.NI PCI 5112 has one 20MHz low pass filter.My signal bandwidth is 10KHz -40MHz that means pass band frequency is in this range. Due to 20MHz low pass filter how I ensure my signal bandwidth?.Otherwise You specifiy the roll off 20MHz low pass filter.

Pls clarify ?

[Anoop@NeST]

Dear Chris,
 
Here i just describe my application.Pls suggest a solution or  suitable DAQ card.

We have an application in which the input signal contains all frequencies above 10 KHz (even frequencies above 100 MHz). However, the information is present in 10K – 40M Hz band. The input signal is to be digitally processed at 100 MHz. Do you have a board that can be used for the above application?

[Chris_D]

Hey Anoop@NeST,

To clarify, when I say the low-pass 20MHz filter is software selectable, I mean that you can select whether the 20MHz filter is on or off. With the filter off, the bandwidth of the 5112 is 100MHz and you can ensure your signal bandwidth. This device will work for you application.