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AFE7444EVM: Short Range Impulse Radar

Part Number: AFE7444EVM
Other Parts Discussed in Thread: AFE7920EVM, , AFE7444

I am trying to build a short range impulse radar which can produce a 1 nanosecond long or even shorter impulses that would be transmitted at below 1.2 GHz frequencies. I was looking into a AFE7920EVM transceivers but i am not sure if it is too much of an overkill. Could someone give me some sort of an advice. Would an AFE7444EVM be enough for me or is there any other transceiver that I should look into which  would suit my application better? Also I wanted to know if there are any other components that I should worry about that are not coming to my mind? 

Thank you in advance

  • Hi Tahir,

    The AFE79xx devices have lower power dissipation in the same mode when compared to AFE7444. So for applications where power dissipation is critical, AFE79xx should be used. AFE79xx also has better performance and higher bandwidth capability. To create very short impulses, you would need higher BW. 

    If you require multi-channel integrated transceivers, AFE7444 and AFE79xx family devices are right options to look at. 

    Regards,

    Vijay

  • Hello Vijay,

    Thank you for your response. I have  another somewhat related question. So if generate a short impulse using the 12 MSPS  DAC capabilities of AFE79xx, would I be able to efficiently(with decent resolution) observe the correct reflections even though it only has 3MSPS ADC? Would I need to use some sort of technique where I would add delays to see reflections in small time frame windows.

    Thank you again for your previous response, you have helped me a lot. 

  • Hi Tahir,

    Please note that Tx sample rate can be as high as 12GSPS (not MSPS). Similarly, Rx sample rate can be 3GSPS. 

    Typically ADC input is band-limited to one Nyquist zone and under-sampling can be used to observe the input. 

    Regards,

    Vijay