3 Expansion of DR

A challenge that then arises from the limitations discussed in Section 1 is designing to a dynamic range that is often not easily achieved via the use of a single device.

The first potential option to be explored is that DR can be expanded via calibration. However, this is often not feasible due to scalability concerns. Typically then, for analog devices, what must be done in such a use case is the design of two (or more) separate amplifiers to effectively break up the DR into sections that are achievable by each of the individual stages in the design.

In this section, the design of one such topology for the INA190 is presented, for a use case of 10 µA to 100 mA, with a 24-V common-mode voltage, and a supply voltage of 5 V. The goal of the design is to achieve < 5% error at any given point on the measurement curve.