Patent ID: 6329878
Filing Date: 2001-12-11
Classification: H03F

Abstract:
An amplifier comprising:an output stage for connection to a first power supply;an input stage for connection to a second power supply;the output stage having first, second, third and fourth, transistors, each having first and second electrodes and a control electrode, the voltage between the control electrode and the first electrode controlling the current flow between the first and second electrodes, the fourth transistor being of a conductivity type complimentary to the conductivity type of the first, second and third transistors;the first and second transistors having their first electrodes coupled to the first power supply and their control electrodes coupled together, the second electrode of the second transistor being coupled to an amplifier output and to the second electrode of the fourth transistor, the first electrode of the fourth transistor being coupled to a power supply common connection and the control electrode of the fourth transistor being coupled to the input stage;the third transistor having its first electrode coupled to the second electrode of the first transistor, its control electrode coupled to the second power supply and its second electrode coupled to the common node coupling the control electrodes of the first and second transistors and to the input stage.