Patent ID: 6642777
Filing Date: 2003-11-04
Classification: G05F

Abstract:
A bandgap reference voltage generator circuit comprising:a first bipolar transistor (T1); a second bipolar transistor (T2); a first resistor (R1) connected so that the voltage drop across said first resistor corresponds to the difference between the base/emitter voltages of said first and second bipolar transistors (T1, T2) and which is located in the collector current path of said second transistor (T2); a second resistor (R2) located in the collector current path of said first and second transistors (T1, T2), wherein the circuit said first transistor (T1) can be operated with a current density other than that of said second transistor (T2); and a control circuit having inputs being connected to the collectors (1,4) of said transistors (T1, T2) and that the collector currents of said transistors (T1, T2) are compared and a signal output at a terminal of said control circuit connected to the bases of the transistors wherein the bases (5, 6) of said transistors (T1, T2) being controlled so that a predefined ratio between the collector currents of said transistors (T1, T2) is set wherein said first resistor (R1) is connected between said base terminals (5,6) of said two transistors (T1, T2) and is, in addition, connected to the collector (4) of said second transistor (T2).