Question

ECE 3424 Student Name & ID: An npn transistor having 1s = 10-"A and B = 100 is connected as follows: The emitter is grounded, the base is fed with a constant-current source supplying a dc current of 10 u A, and the collector is connected to a 5-V dc supply via a resistance Rc of 3 k12. Assuming that the transistor is operating in the active mode, find VBE and Vce. Use these values to verify active-mode operation. Replace the current source with a resistance connected from the base to the 5-V dc supply. What resistance value is needed to result in the same operating conditions? Vcc= +5V Vcc = +5V . Rc = 3 k22 RB Rc 10 μΑ IBV 13H| B С B C O V DE BIB V DB BIR VBE VCE VBE VCE E E (a) (b)

Answer 1

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Given data! -15 А 13 = 100 Is = 10 Vcc =+5v Idc =COMA Rc = 3K 2 a ) Dio de current equation UBE ID Is e Vip - UBE Voltage across the diode .

UBE Тр Vr Is Vse Vr in V, - 26 m mv Cat at room temperature) Given Is = 10-15 A Io Idc =10 MA :: UBE = 26 mux In 10x10-6 no 10-15 UBE = 0.5987 V ✓ .. UBE = 0.59877 VCE " Vcc -lc Rc Ic = ß Idc Ic = 100 X10 X10-6 А Ic ima

VCE 5V - cima x 3K2) V ce 5v- 3 v Vcd 21 Tv Since Base-emittel forward Junction Bias Collectos - Base Reverse Bias. Junction CVce > VBE ) This ensures active - mode of operation b) We need IB =10 MA IB = Vcc - UBE RB RB 5V 0.59870 10 MA

RB 4.4013 V 10x106 RB 440.13 K 22 we need RB = 440013K 2 to result conditions. Same in operating