![]() ![]() ![]() Non-inverting input can greatly increase the input impedance of the circuit. Structure of Instrumentation AmplifierĪmong them, the operational amplifier A1, A2 are in-phase differential input modes. ![]() It is mainly composed of two-stage differential amplifier circuit.įigure 1. The typical structure of the instrument amplifier circuit is shown as in Fig. 2.2 Instrumentation Amplifier Stucture and Principle Therefore, the performance of the instrumentation amplifier circuit directly affects the range of the input signal that the smart instrument can detect. At the same time, for the instrumentation amplifier circuit, the smaller the input signal that can be resolved, the better the wider the dynamic range, the better. The main purpose of amplification is not to gain, but to improve the signal-to-noise ratio of the circuit. The signal amplitude is very small (millivolt or even microvolt magnitude) įor such signals, the first step of circuit processing is usually to amplify small signals with an instrumentation amplifier.The signals input by smart meters through sensors generally have the characteristics of "small" signals: II Introduction 2.1 Instrumentation Amplifier Overview III Instrumentation Amplifier Circuit Design What Are Instrumentation Ampilfiers? CatalogĢ.2 Instrumentation Amplifier Stucture and Principle ![]()
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