I made the configuration according to Figure 79 in the AD9650 manual. The figure shows the dual channel of AD9650 when I used the signal source to output signal amplitude 1VPP, 0.9V offset and frequency 100khz under 70Mhz sampling clock (the signal of sampling clock is directly output by the clock pin of FPGA). For the waveform collected by FPGA (FPGA model: FPGA-XC7A100T-2FGG484I), there always seem to be some jumps at a few fixed points of the waveform, leading to instability of the sampled waveform. These jumps seem to be independent of the relative amplitude, frequency, and bias of the input signal (while changing the signal source and testing other input signals), and this phenomenon still occurs. May I ask if there is something wrong with my software configuration or the hardware circuit?