Source Follower: Voltage Buffer

This lecture covers the operation of a source follower stage, which acts as a voltage buffer to prevent gain reduction when driving low-impedance loads. It explains the large and small signal analysis of the source follower, including the voltage gain calculation and output resistance. The drawbacks of the source follower, such as nonlinearity and voltage headroom limitation, are discussed. Additionally, the lecture introduces the common-gate stage and its role in voltage-level shifting. The content also includes the large signal analysis of the common-gate stage, focusing on saturation conditions and voltage output calculations.