As with an operational amplifier, an in-amp must have a low offset voltage. The output of the bridge is calculated for two condition namely unbalanced and balanced. 2. The circuit diagram of the three op-amp in-amp is shown above. 2.2 Instrumentation Amplifier Stucture and Principle. Instrumentation are commonly used in industrial test and measurement application. There are numerous areas especially in industrial and consumer applications there is a high requirement to measure and control different physical quantities such as measurement of temperature and pressure, measurement and control of humidity, water flow,  light intensity, etc. However where the requirements are not very strict a general purpose op-amps can be employed in differential mode.The op-amp as an instrumentation amplifier must satisfy the following conditions. The opamp can be used over the frequency range, 10. If we impose the condition such that , we obtain V0 as follows: In figure (a), source V1 sees an input impedance given by, and the impedance seen by source V2 is only. Consider the differential amplifier, as shown in figure. providing input offset correction) was considered an instrumentation amplifier, as it was designed for use for test and measurement systems. Instrumentation Amplifier is the basic amplifier and the designing of this can be done based on the requirement in different applications. An amplifier is the same, there is always a very small amount of noise from the electrons whizzing around inside. Know your sensor input before you choose an op amp or instrumentation amp, and know the output requirements of your conditioning amplifier. Thus, the need for a drive amplifier at the signal output conditioning stage becomes the first culprit for op amp afterthought. We describe an ac-coupled instrumentation amplifier (IA) that, in addition to fulfilling those requirements… of what an instrumentation amplifier is, how it operates, and how and where to use it. Hence it has to be amplified such that it will be able to successfully drive the indicator system or the user display system. I) when bridge is balanced: The typical resistive bridge with transducer in one arm is called as transducer bridge. The instrumentation amplifier or in-amp eliminates the requirement for input impedance matching, and thus it makes the amplifier more suitable for the above-mentioned kind of applications. Thus the requirements of an instrumentation amplifier are more rigid than those for general purpose applications. This change in resistance is converted into a proportional electrical signal. Since no current flows into op-amp (ideal characteristics of an op-amp includes infinite input impedance), the current I flowing upwards in R is given by I = (V1 – V2)/R. This is mainly used for accurate and precise low magnitude signal amplification with quite high and accurate closed-loop gain. Which among the following is/are the requirement/s of an instrumentation amplifier? 1. REF of the instrumentation amplifier. 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