Instrumentation amplifier of ordinary op amp

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Instrumentation amplifier of ordinary op amp [Copy link]

In many single-chip microcomputer systems that require A/D conversion and digital acquisition, in many cases, the analog signal output by the sensor is very weak and must be amplified by a certain multiple through an analog amplifier to meet the A/D converter's input signal level requirements. In this case, an amplifier that meets the requirements must be selected. There are many types of instrumentation. Here we introduce a very widely used instrumentation amplifier, which is actually a typical differential amplifier. It only requires three cheap ordinary operational amplifiers and a few resistors to form an instrumentation amplifier with superior performance. It is widely used in industrial automatic control, instrumentation, electrical measurement, medical equipment and other digital acquisition systems.