Operational amplifier

Operational amplifier, comprising:

• a first and second transistors of opposite conductivity types, each having a first and second electrodes, and a collector;
• a first and second voltage followers each having an input and being coupled to the second electrode of the first and second transistors respectively,
• wherein an input signal of the operational amplifier is applied to the first electrode of the first transistor and the input of the first voltage follower,
• further wherein the first electrode of the second transistor and the input of the second voltage follower are coupled in either order to the first electrode of the first transistor and the input of the first voltage follower;
• a pair of means for biasing the first and second transistors coupled separately to the collectors thereof;
• and
• a power amplifier means for amplifying signals appearing at the collectors of the first and second transistors and providing an output signal of the operational amplifier.

Operational amplifier, comprising:

• a pair of transistors of opposite conductivity types, each having a pair of electrodes and a collector;
• means for applying an input signal of the operational amplifier to at least one of the electrodes of each transistor;
• means for coupling together at least one of the electrodes of each transistor;
• and
• a power amplifier means for amplifying signals appearing at the collectors of the transistors and providing an output signal of the operational amplifier.