Imperfections of Operational Amplifiers: Offset and Amplification Chain

This lecture covers the imperfections of operational amplifiers (AO), focusing on offset voltage and amplification chain, polarization currents, and small signal frequency limitations. The instructor explains how imperfections manifest in real AOs, the dominance of the first gain stage's offset, and the impact of input impedance and bias currents. The lecture also delves into minimizing errors using resistors, the model of feedback amplifiers, and the bandwidth limitations of real AOs, including the concept of gain-bandwidth product. Additionally, the discussion includes the slew rate limitation for large signals and the effects of finite current on internal capacitances. Practical examples and calculations are provided to enhance understanding.