1 The AC input to a common emitter amplifier (Figure 1) is such that it is comparable to thermal voltage VT. For such an amplifier: a. Please show how a hybrid – T small-signal model would look like. Do not ignore early effect. b. Please derive relation for the terminal voltage gain and overall voltage gain. O Vcc Rc R RE

What replaces each of the following elements when we draw the mid-band small-signal equivalent circuit for an amplifier: a. a dc voltage source; b. a coupling capacitor; c. a dc current source?

In a full-bridge dc-dc converter using PWM bipolar voltage switching, analytically obtain the value of (V/V) which results in the maximum (peak-peak) ripple in the output current i,. Calculate this ripple in terms of Va, La, and f

explain with diagram or circuit

c) Figure 2.3 shows the circuit diagram of a typical npn BJT common emitter amplifier. The values of RB1-30 kOhm, RB2=10.XY kOhm, Rc-3.XY kOhm, Ic=2.XY mA and Vcc=24 V. If the transistor current gain 3 = 50 determine using the full analysis and assuming VBE = 0.7 V the value of RE, hence identify the location of the Q-point (Ic, VCE, IB and VBE). Now sketch the AC circuit model of this amplifier and determine the value of the ac open circuit voltage gain Av and the ac short circuit current gain Ai. (Assume that Vth = 26 mV). Vin RB1 Cin lin RB2 -10 Rc VB RE + Vcc Vc Cout VE www li Figure 2.3 Vout Ce ¡out x=1 y=7

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........ (Figure-1) R. RB= 380kN,Rc= 1kN B = 100, VBB = Vcc=12V RB ww Vec CC ......... I, V CE СЕ V ВЕ BB Q-1-b) Describe briefly the input / output characteristics and application of Common Emitter BJT Configuration