Patent ID: 6437956
Filing Date: 2002-08-20
Classification: G01R,H03K

Abstract:
A stress-driver circuit for providing a constant voltage (Vce) and a constant current (I=Vin/R) to a bipolar transistor under test, the bipolar transistor having a base, a collector, and an emitter, the circuit comprising:a power source connected to the bipolar transistor collector; an op-amp having a positive input, a negative input, and an output, the positive input biased at an input voltage (Vin) and the negative input having a feedback loop connected thereto, the feedback loop connected to the bipolar transistor emitter; a field effect transistor (FET) having a gate connected to the op-amp output, a drain connected to the power supply, and a source biased to ground through a first resistor and connected to the base of the bipolar transistor; and a second resistor having a resistance and having a first end and a second end, the first end connected to the bipolar transistor emitter and the second end biased to ground.