Compare the two structures shown in the figure below with respect to sensitivity to changes in the overall gain due to changes in the amplifier gain. Use the relation S = K dF as the measure of F dk sensitivity. Select H₁ and H₂ so that the nominal system outputs satisfy F₁ and F2, and assume KH₁ > 0. K K K -OF₁ RO Σ "geg" "g H₂ H₂ (a) H₁ (b) K -OF₂

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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.