Analog-Based Instrumentation Systems
Felix A. Farret, Marcelo Godoy Simões, Danilo Iglesias Brandão · 2017
By understanding the ideal behavior of the differential amplifier, it is possible to establish a set of characteristics that would be desirable, in particular, for instrumentation amplifier purposes. There are many ways to achieve a good-quality differential amplifier, but in practice, it seems a norm for instrumentation purposes that the amplifier configuration. Basically, there are four different types of instrumentation based on voltage-to-current (V-to-I) converters: Single input with ungrounded load, Single input with grounded load, Differential input with ungrounded load and Differential input with grounded load. An amplifier with capacitive coupling converts direct or alternating voltage from the input into pulsed voltage, which is then amplified and reconverted to form an analog voltage similar to the input. The voltage-to-frequency conversion (V/f) may be considered an analog-to-digital conversion and is used in optical transmission or magnetic signals, thereby eliminating the nonlinearities of the components or opto-magnetic cores.