I want to use the Eval-AD9958 (2 Channel 500MSPS DDS evaluation board) to generate two coherent signals:
- A FM signal with carrier frequency fc=125MHz, modulation frequency fM=20MHz and a peak frequency deviation of about Δf=10MHz (modulation index η=0.5): y0(t)=sin(2πfct+ η*sin(2πfMt))
- A reference signal y1(t)=sin(2πfMt)
I guess, this might be possible but just from looking at the eval board software I cannot be sure. This is why I'm asking here.
- My first intuition for channel 0 was to calculate 16 frequencies within fc±Δf (125.0, 128.83, 132.07, 134.24, 135.0, 134.24, 132.07, 128.83, 125.0, 121.17, 117.93, 115.76, 115.0, 115.76, 117.93, 121.17) MHz... and enter those into the 16 "Frequency xx" fields inside the Eval software
- Channel 1 ist basically a single tone signal at 20MHz.
But how can I define the rate (modulation frequency) at which the different frequencies are applied to the output of channel 0? Can I determine this rate / delta t / modulation frequency anywhere inside the software or do I need another external device? I appreciate your help :) sums