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AD9957 QDUC mode

Question asked by systec on Mar 23, 2013
Latest reply on Mar 25, 2013 by KennyG

I tried to output the OFDM (BPSK/QPSK modulated sub-carriers) signal from AD9957 but could not. I set the parameters as QDUC mode.

The main specifications are as follows.

DAC reference clock frequency: 260 MHz

Output carrier frequency: 65MHz

FFT size: 256

Output level:-25 dBm

Sub-carrier Modulation: BPSK/QPSK

IQ baseband signal rate:

QPSK: 60 carriers 63.5spsx160=10.16 Msps

BPSK:19 carriers 63.5spsx19=1.2065Msps

Baseband filter: CIC filter interporation 8

I attached the detailed register values. Please find the attached file. I could not output the OFDM signal with those register values. It does not seem to work as the QDUC mode.

Does any body know how to create the OFDM signal or how to operate as the QDUC mode?