AD9122 for ssb modulation

Dear Sir& Madam,

I am working on a new design which is SSB modulator. I need a quadrature DAC to drive I/Q modulator to generate ssb modulated signal. The DAC that I found is 1230MSPS(AD9122), but I only need max 500KHz ssb modulation bandwidth around the carrier. I will use AD9914 as an I/Q modulator LO (ssb carrier) from 2-1000 MHz with DAC as an envelop geterator  (to generate m(t) from 10 to 500KHz ). Can you please help me to select DAC for that design ? I have checked some lower speed DACs but there is no DAC which has  integrated Phase and Amplitude adjustment. For LO and side band suppression I know that we need that adjustment options integrated in DACs. Please check attached block diagram.  If you can help me to solve that problem I will really be appratiated.

I also need to know, Is it possible to hilber transform inside the AD9122 .


Thanks Serdar

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  • 0
    •  Analog Employees 
    on Mar 29, 2013 12:22 AM

    It looks like you are feeding Data to AD9122 at 435MSPS, is this frequency fixed or does it change? The AD9122 has Phase and amplitude adjustment you needed.

    What output frequency IF are you trying to come out of the AD9122 with. Are you using the interpolation filters of the AD9122?

    Did you mean hilbert transform, we have that in the AD9786 but it has only real DAC output. Ad9122 doesn't have a Hilbert tranform.

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  • 0
    •  Analog Employees 
    on Mar 29, 2013 12:22 AM

    It looks like you are feeding Data to AD9122 at 435MSPS, is this frequency fixed or does it change? The AD9122 has Phase and amplitude adjustment you needed.

    What output frequency IF are you trying to come out of the AD9122 with. Are you using the interpolation filters of the AD9122?

    Did you mean hilbert transform, we have that in the AD9786 but it has only real DAC output. Ad9122 doesn't have a Hilbert tranform.

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