6.40 Consider a transistor for which the base–emitter voltage drop is 0.7 V at 10 mA. What current flows for vBE = 0.5 V? Evaluate the ratio of the slopes of the iC–vBE curve at vBE = 700 mV and at vBE = 500 mV. The large ratio confirms the point that the BJT has an “apparent threshold” at vBE 0.5 V.
6.40 Consider a transistor for which the base–emitter voltage drop is 0.7 V at 10 mA. What current flows for vBE = 0.5 V? Evaluate the ratio of the slopes of the iC–vBE curve at vBE = 700 mV and at vBE = 500 mV. The large ratio confirms the point that the BJT has an “apparent threshold” at vBE 0.5 V.
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