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IWR6843ISK: What side effects can occur when adcStartTime is reduced?

moon sangik
Intellectual 320 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: IWR6843

Hi

We are developing a system using IWR6843 ISK EVM Board.

The system we develop needs to detect objects in close distance, so the smaller the range resolution is the better.

The below config profile was calculated through the Sensing Estimator Tool

profileCfg 0 60 8 12.175 45.375 0 0 88.17 1 64 2000 0 0 158

In this case, the range resolution is 5.32cm, which is much larger than what our system wants.

We have changed the config profile as below to reduce range resolution.

1.adcStartTime reduced from 12.175us to 2.64us
   (mmwave studio recommends 3.47us for 90% setting time.and we have reduced more)


2. Set frequency slope to 4GHz/rampEndTime

The below config profile is the final profile

profileCfg 0 60 8 2.64 35.840 0 0 111.6071429 1 64 2000 0 0 158

I would like to know the expected side effect and how to verify it.

thanks

  • 0
    TI__Mastermind 23725 points

    Hello

    Can you please check the mmWave studio to undersand the suggested  parameters.

    Estimator tool allows you get valid parameters for your sensing requirements.

    For customizing the chrip please see the following:

    - See chirp parameter specific constraints in Radar Interface Documents

    - See mmwave Radar studio tab that suggests limits on certain parameters.

    This will allow you design and customize the chirp within the device's permissible limits.

    Thank you,

    Vaibhav

  • +1
    TI__Mastermind 40335 points

    HI, there:

    With a lower ADC start time, your ADC data sample may not get to a stable stage yet.  I would suggest you to record the raw ADC data and take a look.  You may find some abnormal samples at the beginning part of the chirp. 

    Best,

    Zigang