Semiconductor differential amplifier circuit with feedback bias control

摘要

An input differential amplifier stage (10), which feeds an output stage (20), has a feedback loop originating at a node (N1) in one branch, for controlling the current-source transistor (M5) of that stage. The feedback loop is characterized by a direct connection to the gate electrode of a transistor (M8) which drives the output stage (20), while the output at another node (N2), in the other branch of the differential amplifier stage (10) is fed to another transistor (M9) which also drives the output stage (20).