I require an rf drive centred at ~450 MHz that can be frequency modulated at 50 kHz with modulation depth 1.5 MHz. Is DDS a viable solution? Can anyone adivse?
DDS can perform FM but with limitations. One potential issue is w/ the 450Mhz carrier. At 450Mhz carrier, the image frequency is fairly close to the carrier to filter. You probably need the DDS to operate near 1.1GSPS or higher with a low pass filter, else you might try a bandpass filter. We are working on higher sampling DDSs. The fastest now is 1GSPS.
I would recommend looking at the AD9910. The AD9910 has a 16 bit data parallel port, SPI interface, and 1024 internal RAM for FM modulation.
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