integrator

[tul]

Hi there

does any one tell me how to build an integrator in labview

i want to use integrator in one of my filter design

[MattP]

Hello,

We have VI's for Cascaded Integrator Comb (CIC) filters available as part of the Digital Filter Design (DFD) Toolkit, and we also have Point-by-point and array-based Integration functions available.  Could you be more specific with regards to what your requirements are?  In the absence of other information, I'd say the DFD Toolkit will be your best option.

[tul]

i want to integrate the input signal , i mean just add all the input samples , i am at the moment feeding back the output to input of a saturation sum , i am not sure whether it is a wise way to or not

[MattP]

That can be a valid method, though again more details would be useful here.  Are you building this for an FPGA target by any chance?

I found a pretty good article describing the math necessary to implement the function yourself here, though again the DFD Toolkit already has pre-built and tested blocks that can be used on both Windows and FPGA targets.

[tul]

yes i am building this for an FPGA target , are there any concenrns in doing this

[tul]

i dont think i can use the DFD vi's when i am targeting the FPGA device , because when i am trying to use the filter vi's in my programm it does not allowing me to add on the filter design vi's to my programm , is there any way around to do this?? i am sure there will be a way around , also are there any specific vi's i can use to down sample and upsample when using the FPGA target ???

[MattP]

You can design the filter in a Windows VI, then use our VHDL Code Generator VI to create a VHDL file you can then include into your LabVIEW FPGA design.  You  do not need to use the DFD VI's from the toolkit directly in your FPGA design.  The DFD Toolkit includes several examples that demonstrate this capability as well, you can find these in the Example Finder by browsing to Toolkits and Modules»Digital Filter Design»Fixed-Point Filters.  There are additional FPGA examples in the Fixed-Point Multirate Filters folder in the Example Finder that you may find helpful as well.  You can also examine a set of case studies that take the filter design process all the way through the design, prototype, and deploy phases.