UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Sciences EE105 Lab Experiments Prelab 5 Single Stage BJT Amplifiers Common Collector and Common Base Name Lab Section VCC RS vin VIN RE vout Figure 1 Common collector amplifier 1 Draw the small signal model for the common collector amplifier shown in Figure 1 2 State do not derive the formulas for the input impedance output impedance and voltage gain of a common collector amplifier 1 2 3 Using the following parameters calculate the numerical values of the properties above IS 26 03 fA RS 10 k RE 100 VIN 6 350 V and 270 Ignore the Early effect and make approximations when appropriate 4 How do these properties compare to those of the common emitter amplifier VCC RC iout VB iin Figure 2 Common base amplifier with a current input 5 Draw the small signal model for the common base amplifier shown in Figure 2 Note The current source iin is a small signal AC current source not a DC current source so you must include it in the small signal model 3 6 State do not derive the formulas for input impedance output impedance and current gain Ai iout iin of a common base amplifier 7 Using the following parameters calculate the numerical value of the properties above IS 26 03 fA RC 1 k and VBE 640 mV Ignore the Early effect and make approximations when appropriate 8 How do these properties compare to those of the common emitter amplifier
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