AWR1642: mmwave,How to Get the Accurate Chirp Start Sampling Frequency

?? ?

Part Number: AWR1642

Hi, I would like to ask a question, how to obtain the exact starting frequency of the actual sampling of the mmwave radar chirp?

No specific calculation method can be found from user_guide, Programming Chirp Parameters in TI Radar Devices

As shown in the figure: During the duration of the ADC start time, the slope rate is not a straight line, so the accurate F0 cannot be obtained according to sloperate*ADC_start_time+Profile_start_frequency,So how to get the accurate value of f0?

thanks

kael

over 3 years ago

0 Nathan Block over 3 years ago

TI__Mastermind 37805 points

Hi Kael,

Your analysis makes sense to me. I will ask internally to see if there is a register that has this information, but I think it's unlikely because the mmWave device does not have a GHz ADC on-chip. Is there a specific reason you need to know the frequency at the start of the samples?

Best,

Nate

0 ?? ? over 3 years ago in reply to Nathan Block

Prodigy 100 points

Hi Nate,

Thank you, please give feedback if there is an update, There are no specific reason,only hope to get the accurate frequency for simulation and avoid interference.

Kael

0 Cesar over 3 years ago in reply to ?? ?

TI__Guru*** 149854 points

Hi,

Please see following thread.

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/730050/iwr1642-question-on-adcstarttime

This is the information we have available

thank you
Cesar

Sensors

Sensors forum

AWR1642: mmwave,How to Get the Accurate Chirp Start Sampling Frequency