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TMS320C6678: ultrasound AFE

Philippe Rubbers
Prodigy 60 points
Part Number: TMS320C6678

Reading the paper :https://www.ti.com/lit/pdf/sprabo1

This project for a software based ultrasound system makes use of a certain AFE.
Unfortunately it makes no comment on the part number for this AFE.
Indeed it implies the AFE is demodulating, and then digitising both the I and the Q.
I cannot find such a product, as all the ultrasound AFE digitise the full signal, and only make the I and Q available for off chip digitising.

What AFE did they use, or which AFE digitises both I and Q?

  • 0
    TI__Guru* 78305 points

    Hi Philippe

    This looks like an old application note and I do not see the author listed in TI anymore to trace this further. I am not sure if the development was done with an actual AFE or it was done with an offline /file based IO to show case the DSP processing etc. 

    You will see more collateral here

    https://www.ti.com/tool/S2MEDDUS

    This SDK and the associated software is no longer supported but available as reference.

    If you look at the following application block diagrams

    https://www.ti.com/solution/ultrasound-scanner?variantid=14360&subsystemid=17825

    and click on AFEs, you will see recommended AFEs from TI, and typically as shown in these block diagrams, AFE is typically interfaced over an FPGA , which may provide LVDS, high speed ADC and JESD interface, and then piped over to the DSP over a high speed interface like SRIO (very limited software support lately) or standard interface like PCIe . Both of these are options on C667x etc.


    Hope this helps some.

    Regards

    Mukul 

  • 0 in reply to Mukul Bhatnagar
    Prodigy 60 points

    I think I have figured out what is happening: some AFE have a digital demodulator (and decimation). This is in addition to the analog CW demodulator, which is not digitized. So I guess this digital demodulators were used.  Thanks for you support.