Abstract
The built-in FET-input amplifier is an IEPE accelerometer’s integral electronic part which converts the charge signal going from the PE transducer into the output voltage signal. Another important feature of the amplifier is the transformation of the PE Transducer’s high impedance into the amplifier’s low output impedance allowing transmission of the voltage signal over long cable lengths. Configurations and main parameters of these amplifiers, such as gain, frequency response, noise, input and output impedances, power supply, temperature range, and size are key factors providing the performance characteristics required for an IEPE sensor. This chapter describes two basic types of FET-input amplifier typically used for IEPE sensors: a charge amplifier and a voltage amplifier. The chapter gives detailed description of FET- input amplifiers including their configuration, main characteristics, constructions, and used components and materials.
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