Due to the high pass filters in the signal chain, HPF1 at a minimal cut of frequency of 175kHz and HPF2 with a minimal cut of frequency of 350kHz, frequencies from objects close to the radar will be dampened.
As we understand it, these filters can not be turned off.
This is a problem when we are going to do the antenna calibration, since we want to make the calibration setup as small as possible, since we pay for the space we are using in the production facility.
How does TI handle this when doing calibration? Which distance do you recommend as the minimal distance for a reflector, and which size do you recommend for the reflector?
What are the HPF meant for except for removing the DC component?
Are they for preventing "negative distances" due to phase noise in the signal? Or are they there for attenuating the signal at short distances to prevent overload/saturation/compression effects in the signal chain?
Just to be sure, are there any way to disable the HPF (without getting DC troubles of course)?
