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AWR1443: AWR1443 IF roll off above 5MHz

Vladimir Kolinko1
Prodigy 240 points
Part Number: AWR1443
Other Parts Discussed in Thread: AWR1642, AWR1243

I am looking to estimate the chip limitations at maximum possible chip rates and ranges and would like to get more info about receive (Rx) chain

1) The spec sheet states 5MHz maximum IF bandwidth of the AWR1443 receiver chain but does not specify roll off slope >5 MHz. Clarification would be helpful.

2) Application report SWRA553-May2017 (Programming Chirp Parameters  in TI Radar Devices) shows an example of 15MHz maximum beat frequency in the range domain (Table 1. LRR column). How this can be reconciled with 5MHz available IF bandwidth ?

3)  The receive IF chain is followed by a digital decimation filter. What is the ADC sampling rate of data going into the filter? Is it programmable or fixed ?  If programmable please refer to how-to details.

4) Details on the transfer function (or model) of the two high pass filters in the Rx chain would be appreciated. How the filters behave at high/pass frequencies?

Thank you in advance for comments.

  • 0
    TI__Guru*** 149044 points
    Hi,

    Can you please share more information about the application you would like to use the AWR1443 for? Did you consider AWR1642 as well?

    Thank you
    Cesar
  • 0
    Prodigy 240 points

    Hi Cesar,

    Trex is an R&D company, and we are looking for a low cost integrated

    alternative to our modular multi-chip components for long range MMW FMCW

    radars such as Trex FOD finder product. The AW1642 has low ADC sampling

    rate. Even AWR1443 is putting limits on the non-aliased range and Doppler

    frequencies for this kind of applications. I am looking to find out how

    far we can stretch the performance capabilities of these new chips.

    Thank you,

    Vladimir Kolinko, PhD

    Senior Scientist, Trex Enterprises Corp.

    Tel. 858-646-5708

    > A Message from the TI E2E™ Community

    >

    > Cesar [http://e2e.ti.com/members/20288] replied to AWR1443: AWR1443 IF

    > roll off above 5MHz

    > [http://e2e.ti.com/support/sensor/mmwave_sensors/f/1023/p/665488/2446936#2446936].

    >

    > Hi,

    >

    > Can you please share more information about the application you would like

    > to use the AWR1443 [http://www.ti.com/product/AWR1443] for? Did you

    > consider AWR1642 [http://www.ti.com/product/AWR1642] as well?

    >

    > Thank you

    >

    > Cesar

    >

    > You received this notification because you subscribed to the forum.  To

    > unsubscribe from only this thread, go here

    > [http://e2e.ti.com/support/sensor/mmwave_sensors/f/1023/t/665488/mute].

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    > Flag

    > [http://e2e.ti.com/support/sensor/mmwave_sensors/f/1023/p/665488/2446936?AbuseContentId=6c7a82b1-af6d-4269-be3d-35be689e779f&AbuseContentTypeId=f586769b-0822-468a-b7f3-a94d480ed9b0&AbuseFlag=true] this

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  • 0
    Prodigy 240 points
    Hi Cesar,
    Trex is an R&D company, and we are looking for a low cost integrated alternative to our modular multi-chip components for long range MMW FMCW radars such as Trex FOD finder product. The AW1642 has low ADC sampling rate. I am looking to find out how far we can stretch the performance capabilities of these new chips.

    I have found that another chip, AWR1243, has IF bandwidth of 15MHz and sampling rate of 37.5 MHz. So it will be better for our applications. I would still appreciate more data regarding spectral response (or models) for the HPF 1 and 2 and the roll off response of the IF chain before signal goes into A2D. In particular how much gain suppression HPFs provide at frequencies around 1KHz. Can you also clarify the spec statement about "better than 60 dB anti-aliasing attenuation for any frequency that can alias back into the pass-band". How this is accomplished ?

    Thank you,
    Vladimir Kolinko, PhD,
    Sr.Scientist at Trex Enterprises Corp.