Unit 7. MOSFET Source-Follower Buffer Stage
High-gain stages in amplifiers are usually some form of differential stage or common-source stage. These are inherently high-output-resistance stages and are not suitable for low-impedance loads. The solution for a requirement to drive low-impedance loads is to insert a buffer stage between the output of the common-source stage and the load. The buffer will be a source-follower stage. The name follower comes from the fact that to a good approximation, the output voltage follows the input voltage; that is, it has an open-circuit gain of unity and low output resistance.
Although the output voltage/input voltage relation is sometimes loosely referred to as the gain, it would be more accurate to label ...
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