Is there any limitation for PXI 5670 to generate QPSK signal?

Hi,
I would like to select PXI 5670 to generate the QPSK signal in my system. How does is it make the QPSK modulation?As I understand, QPSK modulation would need to have two AWG to generate the I and Q signal. See below:
But PXI 5670 only integrated one AWG (PXI 5421). So how does it make the QPSK modulation?
Do I need to download the user−specified baseband IQ waveform into the memory first,then playback it to generate the IQ signal and then upconvert it to the desired QPSK signal? if yes, the playback time will be limited by the onboard memory size. Even if I select the one of 256 MB of onboard memory , it can only 1.28 seconds of waveform data at the default sample clock rate of 100 MS/s. Does it means the QPSK signal can only apear within 1.28 seconds? That's definitely not enough for me.
I am not sure if my understanding is correct or not. Any reply is appreciated.
BR,
Ivan Chen
Solved!
Go to Solution.

Hello Ivan.Chen,
This is correct given the PXIe-5611 performs the complex modulation and direct upconversion in the physical analog domain. Typically, you will still be generating your waveform in software based upon I and Q however. The real I waveform will be generated on channel 0, and the real Q waveform will be generated on channel 1. The I and Q analog waveforms will then be modulated in a quadrature fashion and generated at the appropriate RF frequency.
The fundamental difference between the PXI-5670 and PXIe-5673 is that your the PXI-5670 eventually needs to received a waveform at full rate (100 MS/s) which has already been complex modulated while the PXIe-5673 only requires two real waveforms, I & Q, which can be at streamed to the device at a decimated rate since the onboard signal processing supports interpolation. This allows the PXIe-5673 to be an ideal streaming platform. It is also much faster in regards to tuning, and is capable of a 4x instantaneous bandwidth improvement - the PXI-5670 is 20 MHz, while the PXIe-5673 is > 100 MHz in bandwidth.
Check out the specifications for the PXIe-5673 for more detail on the overall device, as well as the PXIe-5450 specifications for more detail on the onboard signal processing capabilities.
Chris Behnke
Sr. RF Engineer
High Frequency Measurements

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