ElectoWorld

It should be noted that the operational amplifier is an active component and that it has a low output impedance. Namely that he will be able to behave like a source of tension.  This is useful when you apply a voltage with low load carrying capacity as input. We will speak of a "buffer" stage. it is designed to allow impedance matching between two successive stages of a circuit. Of course, this does not go without modification of the input signal: it is therefore necessary to be careful with the offset introduced by the AOP, the distortion that it will insert on the input signal, its band gain product and thus its be able to correctly pass high frequency signals,Note that the input and output are not reversed. Linear applications 1) Voltage follower amplifier Follower op amp b) formula Vout = Vin c) Remarks The resistance at the input of the assembly is infinite. The voltage follower makes it possible to take a voltage without disturbing it, because it has...

  Definition An instrumentation amplifier is an electronic device for processing weak electrical signals. The typical application is the processing of signals from measurement sensors. Its operation is based on the principle of differential amplification. The instrumentation amplifier is generally made from one or more operational amplifiers, in such a way that it improves their intrinsic characteristics: offset, drift, amplification noise, open loop gain,  common mode  rejection ratio (CMRR), input impedance. fig 1 :instrumentation amplifier The first stage: we will use the fact that the inputs v + and v- of the amplifiers are equal, and that the input impedances are infinite. the current flowing in Rg and in the two resistors R is the same, so We can write: V1 − V2 = Rg× i Vod = (2R+Rg) x i Vod = (V1-V2) x ((2R+Rg) /Rg) The common mode voltage at the input of the assembly is: (Vcm)input = (V1+V2) / 2 the common output mode is equal to: (Vcm)output= (Vo...