Honored Contributor
Honored Contributor"It would be useful if you posted images of the ADC output (captured using a scope) and the DAC data plotted using say MATLAB's stair() function (so that it looks like sampled data)."
Attached is a picture taken from an oscilloscope. The blue signal is 2V p-p and is the sinusiodal output from a function generator at 1MHz. The yellow is the corresponding output from the FPGA DAC with ~50mV p-p. As for the ADC, do you recommend using the SignalTap II logic analyzer for analog aquisition? "Can you post a link to the specific board(s) you are using, so that we can see what ADC/DAC is used." I'm using the Cyclone III DSP Development kit with an HSMC data conversion card: https://www.altera.com/products/boards_and_kits/dev-kits/altera/kit-cyc3-dsp.html The ADC is the Analog Devices AD9254, and the DAC is the TI DAC5672: http://www.analog.com/media/en/technical-documentation/data-sheets/ad9254.pdf http://www.ti.com/lit/ug/slau139b/slau139b.pdf "What frequency are you trying to generate? Many ADC/DAC kits have balun/transformer inputs/outputs which limit the range of frequencies you can test with." The goal is to use a frequency comb filter on an analog-->digital signal and then delay that signal by some amount before converting it back digital--> analog. The frequencies should be from 1 - 75MHz (nyquist frequency of the ADC) The HSMC card features transformers, so that shouldn't be the issue. , but their frequency range is .004 - 300MHz http://www.minicircuits.com/pdfs/tt1-6-kk81.pdf I will definitely check out those documents you mentioned! Thanks! Chris
