Optimize linear-sensor resolution

摘要

A wide variety of sensors and transducers of physical phenomena work via the mechanism of variable resistance. These devices sense temperature, light, pressure, humidity, conductivity, and force, for example. Such sensors measure the physical parameter of interest by reading out the inherent parameter-sensitive resistance or conductance. All resistive sensors share the need for interface circuitry that provides a suitable source of excitation current and appropriate gain and offset of the resulting parameter-dependent voltage. The circuit in Figure 1 and the design equations provide a universal solution for an application-specific, optimum-resolution, ra-tiometric interface of almost any resistive sensor.