Patent ID: 6657495
Filing Date: 2003-12-02
Classification: H03F

Abstract:
A multi-stage operational amplifier comprising:an input stage for providing a differential voltage signal; and an output stage for receiving said differential voltage signal, said output stage comprising: an upper current control circuit; and a lower current control circuit, wherein said upper current control circuit comprises a first low voltage transistor for receiving said differential voltage signal, said first low voltage transistor providing a first low voltage transistor current, wherein said lower current control circuit comprises a second low voltage transistor for receiving said differential voltage signal, said second low voltage transistor providing a second low voltage transistor current, wherein said upper current control circuit comprises a first high voltage transistor for receiving said first low voltage transistor current and providing a first amplifier output, and wherein said lower current control circuit comprises a second high voltage transistor for receiving said second low voltage transistor current and providing a second amplifier output.