High Impedance Sensors
Walt Kester, Scott Wurcer and Chuck Kitchin
Many popular sensors have output impedances greater than several megohms, and thus the associated signal-conditioning circuitry must be carefully designed to meet the challenges of low bias current, low noise, and high gain. Figure 4-33 lists a few examples of high impedance sensors.
Figure 4-33 High impedance sensors
A large portion of this section is devoted to a germane example, the analysis of a photodiode preamplifier. This application demonstrates many of the problems associated with high impedance sensor signal-conditioning circuits, and offers a host of ...
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