IWR1843: FFT peak level change when the IWR1843 is cold

Hi,

We are looking at your query. Please allow us a couple of days to respond.

Regards

Hi,

A couple of follow up questions:

1. What is the temperature difference between the different performances observed?

2. Is temperature calibration being done periodically to address certain temperature changes?

If calibration is not done properly, it is likely to observe a difference in the said order across temperature variations.

Thanks,

Swarnendu

Hello, 

Thanks fot reply. I answer your questions; 

1. I don't know what the temperature is inside the MMIC, but I run it at room temperature.

 It always occurs if I let the MMIC cool down enough by powering it OFF for a while. 

2. Since the radar is a commercial product, I don't know if temperature calibration is done periodically. 

Regards, 

Shoko 

Thanks for the follow up.

To understand the issue better, I would like to ask a few more questions:

1. For how long you see the difference before it gets restored?

2. Do you observe the difference when you turn on the device after long time only? Or do you observe the difference every time you turn on the device, no matter for how long it was running before?

3. When you say powering it on, do you disconnect the power source and reconnect or just reset the device with power supply always connected?

Thanks,

Swarnendu

Hello, 

I answer your questions; 

1. By turning the power on/off about several times, the peak level change will no longer occur. 

 But today the level change occurred even after turning it on and off 10 times, so it may not be related to temperature.

 Is it failing to read the any LUT?

2. I don't know because of reason 1). 

3. It means disconnect/reconnect with power line. 

Regards, 

Shoko 

Hi,

Thanks for the follow up.

I believe you are using the SDK binaries. The device is supposed to be periodically calibrated. It might take a couple of seconds for the device to get calibrated after the device starts chirping. For that duration, you might observe a difference in the detection peak. This is expected.

If you turn on and off very fast, it might take more time to calibrate. 

Thanks,

Swarnendu

Hello Swarnendu, 

Thank you for the information. Please let me ask you one thing. 

>> If you turn on and off very fast, it might take more time to calibrate. 

Please let me know why it might take more time to calibrate if I turn on and off very fast. 

Regards, 

Shoko