IWR1443BOOST: The internal workflow of the radar when capturing ADC data

In particular, what happened in the process of receiving antenna to get ADC_data.bin after receiving the echo signal, and what processing was carried out on the echo signal.

HI, Kelong:

You can find a block diagram in the device datasheet.  Please check on the device datasheet document.   An example is given: 

You can see that at the receive side, the received signal is going through LNA, and mixed with transmit signal, then go through IF band filtering and amplifier before going to the ADC. 

Best,

Zigang

HI, Zigang:

Is this "IF Band Filtering" the same thing that I've circled?

If it is, then it means that the output of the mixing signal has gone through a high-pass filtering.

So when I use radar to measure low frequency moving targets, which is lower than the cutoff frequency, does it cause signal distortion? How can I avoid it or fix it?

Best,

Kelong

HI, Kelong:

The ADC is sigma-delta ADC.  It sampled at very high rate and followed with several stages of digital down-sampler before gets to the ADC sampling rate that customer configure.   All the digital down-sample stages has very sharp low pass filter.  So, users will not have aliasing problem.  But the highest IF bandwidth is about 90% of ADC sampling rate due to the low pass filter.  For example, if we program the ADC rate to be 5MHz, then the highest IF frequency supported in this configuration is about 5*90% = 4.5MHz. 

Best,

Zigang

HI, Zigang:

Is the output of mixer I signal and Q signal? If so, how do I signals and Q signals come from, respectively? What is the relationship with the complex numbers in the final adc_data.bin?

Best,

Kelong