1
\$\begingroup\$

I'm looking to make a software defined radio, and I'm currently looking at what DAC to choose. I'm fairly new to this area of RF design, so I don't know what specs to look for. Most of my signals will be ~14MHz SSB transmissions (focusing on the transmitter right now). How many MSPS per second will my DAC need? Also, what bit depth should I be looking at? I've seen other designs use a low-frequency DAC, and the only reason I can see this working is if they use a frequency upconverter.

\$\endgroup\$
1
\$\begingroup\$

Ok, so after learning more about radios in general, I learned that you don't necessarily need to sample at 14MHz to digitally read a 14MHz signal. You can use a local oscillator and an RF mixer to down-convert the 14MHz down to something easier, like 1MHz. This is what you sample with the DAC. So the required DAC really depends on what intermediate frequency you choose.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.