Hi everyone,
I built a PSK transceiver using 5640R FPGA. But the RF output is not correct, as shown in pic1. The envelop of the RF output is not constant. There is a 1us pit whennever "1" becomes "0" ,or "0" becomes "1".
I don't know the reason of the problem. I even don't know why the length of pit is 1us, not 10us or 0.1us.
Please help me.
Now the PSK modulation is realized in Host as shown in pic2. The FPGA part is shown in pic3.
thanks!
Niton
