Generating Signals - Noisy Second Channel
Posted: Thu Feb 01, 2018 8:15 pm
Hi!
I'm developing a sinusoidal signal generator with Red Pitaya. I attached the RLT circuit to help understand what i did.
So, first i get the 125MHz clock from ADC, this clock goes to Clocking Wizard (clk_wiz_0), the outputs of this block are: 125MHz clock output (clk_out1) and 250MHz clock output (clk_out2), those clocks are 90ยบ dephased.
I use two DDSs to generate the sinusoidal waves, those DDSs are controlled by the PS(design_1).
And we have the DAC_V2 block, that basically drives the signals out to the phisical DAC.
The circuit for both channel is exactly the same, but i get the first channel working fine and the second with a lot of noise. See the attached pictures.
Hope some one could help me to figure out why this is happening.
I'm developing a sinusoidal signal generator with Red Pitaya. I attached the RLT circuit to help understand what i did.
So, first i get the 125MHz clock from ADC, this clock goes to Clocking Wizard (clk_wiz_0), the outputs of this block are: 125MHz clock output (clk_out1) and 250MHz clock output (clk_out2), those clocks are 90ยบ dephased.
I use two DDSs to generate the sinusoidal waves, those DDSs are controlled by the PS(design_1).
And we have the DAC_V2 block, that basically drives the signals out to the phisical DAC.
The circuit for both channel is exactly the same, but i get the first channel working fine and the second with a lot of noise. See the attached pictures.
Hope some one could help me to figure out why this is happening.