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How to send data to the TX DAC Buffer?

Question asked by James.ranck on Mar 5, 2013
Latest reply on Mar 7, 2013 by mhennerich

I have a single tone signal in I/Q format in an ASCII file. In this file the first column contains I data and the second column contains Q data. I have a script that takes that data and creates a binary file ( compatible with an Agilent ESG) after scaling the data to 16bits. The ASCII files has 1ms of data with 61440 samples. I then run the following two commands.

 

dd if=/dev/1MHz_tone.bin of=$dev bs=$buffer_size count=1

echo 1 > $dac_path/buffer/enable

 

On the spectrum analyzer, I do not see a single tone at the expected frequency instead I see noise.

 

Can you let me know the following two things:

1) let me know if the ASCII files needs to be formatted in a certain way

2) what is the correct way of sending IQ data to the DAC buffer

 

Thank you.

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