In certain cases the analog input signal amplitude/power might vary considerably, for example, due to varying RX signal strength, or the presence of blocker/interferer signals. This variable signal level is traditionally handled externally using Variable Gain Amplifiers (VGA)/Digital Step Attenuator (DSA) which can adjust the amplitude for the optimal input range.
The DSA is integrated with the buffer, as shown in the following overview diagram.
Figure 1. DSA Overview
