Patent ID: 6861901

Claim:
A voltage follower comprising a first field-effect transistor (MN 1 ) whose gate forms the input of said voltage follower, and a second field-effect transistor (MN 2 ) whose drain connected to the gate forms the output of said voltage follower, whereby the sources of said two field-effect transistors (MN 1 , MN 2 ) are connected to each other and to the drain of a third field-effect transistor (MN 3 ) serving as current source and to the gate of which a predefined bias voltage is applied, and a fourth field-effect transistor (MN 4 ) whose source-drain path is circuited between the output of said voltage follower and the drain of said third field-effect transistor (MN 3 ) and whose gate is connected to the gate of said third field-effect transistor (MN 3 ).