Patent ID: 6229394
Filing Date: 2001-05-08
Classification: H03F

Abstract:
A circuit comprising:a first transistor having a base, and an emitter;a second transistor having a base connected to the base of the first transistor and an emitter;a first resistor having a first terminal coupled to the emitter of the first transistor and having a second terminal coupled to a first voltage potential (V-);a second resistor having a first terminal coupled to the emitter of the second transistor and having a second terminal coupled to the first voltage potential (V-);a third resistor having a first terminal and a second terminal, the second terminal being coupled to a second voltage potential (V+);a fourth resistor having a first terminal and a second terminal, the second terminal being coupled to the second voltage potential (V+);a third transistor having a collector to emitter path coupling a first terminal of the third resistor to the first terminal of the second resistor, and having a base coupled to the first terminal of the first resistor; anda fourth transistor having a collector to emitter path coupling the first terminal of the fourth resistor to the first terminal of the first resistor, and having a base coupled to the first terminal of the second resistor.