Inphase (I) and Quadrature (Q) components of signals

Hi Lee,

--- Quote Start ---

I can use NCO megaCore function to generate I and Q data now. Got a question for CIC and FIR MegaCore functions. Should the inputs to these two filters in unsigned/sign integer number format or unsigned/sign fractional number format (p4-1, FIR Compiler User Guide attached)? I think unsigned/sign fractional format means a number is always smaller than 1. So floating number input such as 12.111 is not allowed. Is is corret?

--- Quote End ---

Altera has a habit of changing their IP cores, so any answer I give could be wrong :)

The best way to answer these questions is to create a Modelsim simulation and provide the simulation test stimulus and check the response. Then repeat that sequence with the MATLAB model.

In fact, the cores usually provide a simple (usually quite useless) testbench. You should be able to determine the appropriate data format using those testbenches.

Cheers,

Dave