designed a summing amplifier that could amplify a 1mV sinusoid (Vina) into a sinusoid with 1V amplitude and 3.5V offset. The value for R1a is 1k ohms, for R1b is 1mega ohms, R2 is 1 mega ohms, and Vin b is -3.5V. What is the input offset voltage?

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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.