Question

Post lab 1. From the experimental data in tables 1 and 2, obtain the following; a. Input characteristics - plots of VBE (x-axis) vs Ib (y-axis) with constant values VCE b. Output characteristics - plots of VCE (x-axis) vs Ic (y- axis) with constant values of Ib. c. Dynamic input resistance and output resistance 2. DC current gain () of the transistor and compare this value with that of the value given in the datasheet. 3. What are the uses of three regions of operations of a BJT? 4. Why we should keep the operating point of transistor either in cutoff or saturation region when it is used as a switch? 5. Why common-emitter configuration is preferred when a BJT is used as a switch?

Answer 1

9 (A) 18. (VPE-30) (VEF OV) 0.0470.0948 0.047 0.1949 IUBE 1 Active Lineal r u Salutation 9. TEUTB=100MA. samdi L eo IR-504 Vee -23-342 50UA Dynamic UCE sat=0-27 cutoft 2 Input wsistance Oube: 0.39634-0.2948 94542 Jib 10.784 -0.9814 Dynamic op resistane - 24e - 0.8-04 dic 0-777-0.6570 a) Je: BIB B= Ic - 8.3 MA = 166 Son Is SOHA " B= 91 for IB = 10044 3) Three regions of operation (Active region CP) Linear region (3)Cut offregion 4) In Cutbff region No Current flows through BJT (open) & in saturation sogion it act as resistor (showers 5) In CE Consfiguration (BJT aci as inverter) and thans in CE only output resistance high a vp resistance be. & offers high gain