Patent ID: 6242967
Filing Date: 2001-06-05
Classification: H01L,H03K

Abstract:
A semiconductor device comprising:a first unipolar transistor provided in a front stage of the device and including a drain, a source and a gate;a second unipolar transistor provided in the front stage and including a drain, a source and a gate; anda bipolar transistor provided in a rear stage of the device and including a collector, a base, and an emitter;wherein the drain and the source of said first unipolar transistor are connected to the collector and the base of said bipolar transistor, respectively, and the drain and the source of said second unipolar transistor are connected to the emitter and the base of said bipolar transistor, respectively, andwherein said bipolar transistor provided in the rear stage comprises a plurality of Darlington-connected bipolar transistors, said second unipolar transistor comprising a plurality of second unipolar transistors that respectively correspond to said Darlington-connected bipolar transistors, each of said second unipolar transistors having a source that is connected to a base of a corresponding one of said Darlington-connected bipolar transistors, and a drain that is connected to an emitter of one of the bipolar transistors that is located in the last stage.