--- Quote Start --- Can you tell me the reference book for implementing Hilbert Transform on FPGA. --- Quote End --- I don't recall a specific book with an FPGA example, but I just had a quick look on Wikipedia ... http://en.wikipedia.org/wiki/hilbert_transform Scroll down to the "Discrete Hilbert transform" section and you'll see what I was talking about. What is it you are trying to do? Cheers, Dave