i want to make a BPSK modulation system works on 400MHz.i have two ideas.
one of them is choose the 1GSPS DDS chip,like AD9912,AD9910,to modulate directly.
another one is use a PLL chip with PSK modulation ,like ADF4158,to do it.
the first one have a question that the 400MHz frequency is high and the waveform is not perfect.
so i want to know which one is more reliable?