# CE Amp.pdf - Common-Emitter(CE Amplifier Ryerson University...

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Last Updated: Jan 21, 2016-AY 1 Ryerson University Department of Electrical & Computer Engineering ELE 404 Common-Emitter (CE) Amplifier IntroductionIn this lab you will bias a Bipolar-Junction Transistor (BJT) in the active mode, and also tests a Common-Emitter (CE) amplifier. Moreover, you will learn a technique for experimental evaluation of the input and output resistances of amplifiers, in general, and the CE amplifier, in this case. For this lab, you will use an NPN BJT, the 2N3904. Pre-lab AssignmentP1.For the transistor circuit of Figure 1, calculate the node voltages 𝑉𝐵, 𝑉𝐶, and 𝑉𝐸, as well as the branch currents 𝐼𝐵, 𝐼𝐶, and 𝐼𝐸. Note that the resistances are different for different lab sections and, therefore, you must consult the document posted on D2L to know the resistance values specific to your designated lab section. Otherwise, assume that 𝑉𝐶𝐶= 15 𝑉, 𝛽= 150, 𝑉𝐵𝐸,𝑜𝑛= 0.7 𝑉, and 𝑉𝐶𝐸,𝑠𝑎𝑡= 0.3 𝑉, and ignore the Early effect. Based on the calculated node voltages and branch currents, first establish the fact that the transistor is in the active mode and then determine the ac parameters 𝑔𝑚, 𝑟𝑒, and 𝑟Complete Table P1. Show all the work. 𝜋. Figure 1. Transistor circuit. Table P1. Quiescent voltages and currents, and ac parameters, of the transistor circuit of Figure 1. 𝑽𝑩[𝑽]𝑽𝑪[𝑽]𝑽𝑬[𝑽]𝑰𝑩[𝒎𝑨]𝑰𝑪[𝒎𝑨]𝑰𝑬[𝒎𝑨]𝒈𝒎[𝒎𝑺]𝒓𝒆[𝒌𝛀]𝒓𝝅[𝒌𝛀]R1RCREVCCR2VEVBVCICIBIB
Common-Emitter Amplifier 2 P2.Using the results of Step P1, and assuming that 𝑉𝐶𝐶= 15 𝑉, 𝑅𝑆= 50 Ω, and 𝑅𝐿= 10 𝑘Ω, manually calculate the no-load voltage gain 𝐴𝑣𝑜, voltage gain 𝐴𝑣=𝑣𝑜/𝑣𝑖, input resistance 𝑅𝑖, and output resistance 𝑅𝑜of the Common-Emitter (CE) amplifier of Figure 2. Complete Table P2. Show all the work. Table P2. Parameters of the CE amplifier of Figure 2. 𝑨𝒗𝒐[𝑽/𝑽]𝑨𝒗[𝑽/𝑽]for 𝑹𝑳=𝟏𝟎𝒌𝛀𝑹𝒊[𝒌𝛀]𝑹𝒐[𝒌𝛀]Figure 2. Common-Emitter (CE) amplifier based on the circuit of Figure 1. R1RCREVCCR2vEvBvORovCvIRSvS+-Signal SourceRLRiC1C2C3RE2
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