Folded-cascode amplifier arrangement with current mirror amplifier

An amplifier arrangement comprising:

• a first folded-cascode configuration including first and second transistors of complementary conductivity type;
• a second folded-cascode configuration including third and fourth transistors of complementary conductivity type to that of said first and second transistors, respectively;
• a fifth transistor of like conductivity type to that of said first transistor, said first and fifth transistors being connected in a first long-tailed pair configuration including means for supplying tail current thereto;
• a sixth transistor of like conductivity type to that of said third transistor, said third and sixth transistors being connected in a second long-tailed pair configuration including means for supplying tail current thereto;
• means for applying input signals between a common connection of the respective input electrodes of said first and third transistors and a common connection of the respective input electrodes of said fifth and sixth transistors;
• means for applying a reference potential to a common connection of the input electrodes of said second and fourth transistors;
• means for connecting the respective output electrodes of said second and fourth transistors for supplying output signals therefrom;
• first current mirror amplifying means having input circuit means to which the main conduction path of said fifth transistor couples and having at least first output circuit means coupled to the main conduction path of said second transistor, wherein the current flow of said first output circuit means is poled for reinforcing the main current flow of said second transistor;
• and
• second current mirror amplifying means having input circuit means to which the main conduction path of said sixth transistor couples and having at least first output circuit means coupled to the main conduction path of said fourth transistor, wherein the current flow of said first output circuit means of said second current mirror amplifying means is poled for reinforcing the main current flow of said fourth transistor.

An amplifier arrangement comprising:

• first and second transistors of complementary conductivity types, each having respective output and common electrodes and a respective main conduction path therebetween, and each having a respective input electrode, the output electrode of said first transistor connecting to the common electrode of said second transistor;
• means for applying an input signal to the input electrode of said first transistor to cause a signal current flow in the main conduction path thereof;
• means for applying a reference signal to the input electrode of said second transistor;
• constant current generating means coupled for supplying quiescent currents to the respective main conduction paths of said first and second transistors;
• and
• current mirror amplifying means having input circuit means to which at least the signal current flow in the main conduction path of said first transistor is coupled, and having output circuit means coupled to the main conduction path of said second transistor for supplying output current thereto, said output current being responsive to the signal current flow of said input circuit means and being poled for reinforcing the signal current flow in the main conduction path of said second transistor.