SBOA536 December 2021 INA240
This topology resembles the classical diff amp, designed as either single stage or a cascade of two. The total gain equals to the product of the gains of all stages. The CMRR of this topology depends on the matching of resistors. Some form of trimming is necessary to achieve high CMRR. Figure 4-1 shows a block diagram of a CSA based on diff amp topology.