Maitry07
Advanced Member level 4
Hello All,
My input frequency is pure sine wave RF signal ( No modulation) . My requirement is to use direct sampling reception of the input signal, generate I,Q using DDC algorithm. and my main aim is to calculate amplitude and phase from the received I and Q samples.
Now, My input frequency is slightly varying in between 1 MHz. let's say, right now my input frequency is 40 MHz, then its variation is from 39-41 MHz. So, I am planning to set the NCO frequency as 39 MHz. Then my DDC output ( complex output spectrum) will be from DC-2 MHz based on the variation of the input frequency. also, DDC output decimation is done up to 10 MSPS. so DC-2 MHz will be within the range of the Decimation filter.
and then from the generated I,Q , We will measure the amplitude and phase. I am thinking of the above, so that I don't have to vary NCO frequency every time there is a slight change in input frequency. As my main signal is sine wave and my main aim is to measure amplitude from the received I,Q samples.
Is my above approach correct to have the DDC output variable within the DC-2 MHz range and not constant DC ?
It would be very helpful if you could suggest and provide support on the above case as soon as possible.
My input frequency is pure sine wave RF signal ( No modulation) . My requirement is to use direct sampling reception of the input signal, generate I,Q using DDC algorithm. and my main aim is to calculate amplitude and phase from the received I and Q samples.
Now, My input frequency is slightly varying in between 1 MHz. let's say, right now my input frequency is 40 MHz, then its variation is from 39-41 MHz. So, I am planning to set the NCO frequency as 39 MHz. Then my DDC output ( complex output spectrum) will be from DC-2 MHz based on the variation of the input frequency. also, DDC output decimation is done up to 10 MSPS. so DC-2 MHz will be within the range of the Decimation filter.
and then from the generated I,Q , We will measure the amplitude and phase. I am thinking of the above, so that I don't have to vary NCO frequency every time there is a slight change in input frequency. As my main signal is sine wave and my main aim is to measure amplitude from the received I,Q samples.
Is my above approach correct to have the DDC output variable within the DC-2 MHz range and not constant DC ?
It would be very helpful if you could suggest and provide support on the above case as soon as possible.