SWRA820B May 2024 – November 2024
To evaluate the chirp configuration manually, consider the following settings:
First, look at the HPF setting and Frequency Slope to make sure the requirements for RX gain are met. In the example pictured in Figure 5-1, HPF setting = 1400kHz and Frequency Slope, S (MHz/μs) = 240. This means the maximum RX gain is 36 (see Figure 4-1). In this case, the decision is made to change the RX gain to 36 or below to make sure that the maximum receiver gain constraint is met.
Next, look at the TX backoff for the frequency range. Here the frequency range is 57–63GHz so use the data in Figure 4-2. This shows the minimum TX backoff as 3. In this case, the decision is to change the TX backoff to 3 or above to make sure the minimum back off constraint is met.
With the changes of RX gain from 40 to 36 and the TX backoff from 0 to 3, there is little or no risk of ADC saturation and the errors in the sensing estimator are cleared.