the source follower has a controlled source circuit, the controlling signal being derived from the source circuit of the follower

Full Title

Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00 > Indexing scheme relating to amplifiers in which input being applied to, or output being derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower > the source follower has a controlled source circuit, the controlling signal being derived from the source circuit of the follower