So my question is this: How to convert sampled real audio signal to it's IQ components for IQ modulation?
For instance: WHen I have my DSP or FPGA receive a audio signal through a ADC, which is just the RAW A/D value. Now I want to run this through a DAC to IQ modulator to get let FM modulation.
How would I convert the raw A/D value into IQ? How do i break this signal down to In-phase and quadrature component? Do I do FM modulation in the DSP/FPGA and get the IQ from that or just split the audio baseband into it's IQ components?
I'm in the process of converting FSK transmitter from older obsolete design to newer design. So as I'm studying IQ, i was wondering what would happen if I wanted to send a analog sine wave through the IQ modulator, like LTC5599. How would I convert a analog sine wave to I and Q send it as input to the LTC5599?