Hello, Let me right again in this forum on the same topic. But know in English. Whatever my English is very poor. I am working for about 4 month's ego with an ML405 Xilinx Virtex 4 board and I wanted now to implement a Software Defined Radio (SDR). I understand everything that relates to SDR (theory, operation, Etc..) Very good. Likewise, I also understand VHDL and VERILOG. Now I would like to know if someone is thus also employs An SDR Board on the above (or others) to implement appropriate Experience exchange.
In following a detailed overview of what I Made now:
First, I strive times only to receive an AM signal.
Hardware is on the board as much: DA converter (LM4550) National and an external A / D converters (LTC2208) by Linear Technology. I have prepared all software developed (ADC.vhd, DAC.vhd, DDC.vhd ,...)I make already the simulation. Now, I must try my signals: and with a Function generator, I would like to generate a sine wave, and then the sine wave through the FPGA with the process by the AD and DA converters. I Am suppose to have the same signals again after the DAC.
Example. Sine (1Khz) ----> ADC -> FPGA ---> DAC ---> sinus (1Khz) I can hear something (signal) at the output (by the DA converter) with the Headphones. However, I cannot measure it with the oscilloscope. I had already tried without much success, and ask what the problem Lie? Whether it down sampling, or rather in a Clock functions?
Did someone get an idea or a tip for me?
I look forward to all suggestions and thank you in advance...
Chindji