Figure below shows a circuit for an instrumentation operational amplifier which has a voltage gain of 3 when SW 1 is open. I. Calculate the value of R3  2. When SW 1 is closed the voltage gain is 20, calculate the of Rg  3. When SW1 is closed, calculate the output voltage for the following input conditions, V1=+2.6V, V2=+3V

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Multistage Amplifier

The multistage amplifier is generally a voltage or power amplifier. The multistage amplifier has a number of single stage amplifier that are cascaded together. Since a single stage amplifier output is not useful, they are being replaced with multistage amplifiers or multistage transistor amplifiers. The multistage amplifier are used where the gain required is high or the input signal is very small such that only a single stage amplifier cannot amplify it.