A certain class C amplifier transistor is on for 15% of the A. What is the average power dissipation for maximum output? B. What is the resonant frequency of a LC circuit with L = 15 mH and C = 1.5 μF? C. What is the maximum peak-to-peak output voltage with VCC = +20 V? D. What is the efficiency of the class C amplifier if the equivalent parallel resistance (Rc) in the collector LC circuit is 40 Ω?
![Question 6. Consider the Common Emitter (CE) amplifier in figure B3 below. The capacitor Cin = 1 μF, VCC = 12 V, βF = 150, and the low cut-off frequency is 100 Hz. Assume VBE = 0.7 V. VCE−5 AT for this BJT transistor is 0.2 V. RC = 800 Ω, and RE = 120 Ω. The quiescent collector current is 5 mA Figure B3: Common Emitter Amplifier circuit (I) Draw the small signal model for the CE amplifier [3 marks] (II) What is the transconductance gain of the amplifier? [2 marks] (III) What is the voltage gain of the amplifier - with and without a bypass capacitor (CE)? [4 marks] (IV) Determine a suitable value for the bypass capacitor CE. [3 marks] (V) Determine a suitable value for the total bias resistance (RB1+RB2). [5 marks] (VI) Determine specific values for bias resistors RB1, RB2. [5 marks] (VII) Figure 4 below shows a common-source amplifier constructed using a MOSFET transistor. igure 4: common-source amplifier circuit This circuit also uses two bias resistors to control the operating point of the amplifier. What advantage does this circuit have over the common emitter circuit in terms of selecting component values for the bias resistors to reduce power consumption? [3 marks]](https://www.doubtrix.com/uploads/editor/5484415393VBaudgJDhA.jpg)
![Question 6. Consider the Common Emitter (CE) amplifier in figure B3 below. The capacitor Cin = 1 μF, VCC = 12 V, βF = 150, and the low cut-off frequency is 100 Hz. Assume VBE = 0.7 V. VCE−5 AT for this BJT transistor is 0.2 V. RC = 800 Ω, and RE = 120 Ω. The quiescent collector current is 5 mA Figure B3: Common Emitter Amplifier circuit (I) Draw the small signal model for the CE amplifier [3 marks] (II) What is the transconductance gain of the amplifier? [2 marks] (III) What is the voltage gain of the amplifier - with and without a bypass capacitor (CE)? [4 marks] (IV) Determine a suitable value for the bypass capacitor CE. [3 marks] (V) Determine a suitable value for the total bias resistance (RB1+RB2). [5 marks] (VI) Determine specific values for bias resistors RB1, RB2. [5 marks] (VII) Figure 4 below shows a common-source amplifier constructed using a MOSFET transistor. igure 4: common-source amplifier circuit This circuit also uses two bias resistors to control the operating point of the amplifier. What advantage does this circuit have over the common emitter circuit in terms of selecting component values for the bias resistors to reduce power consumption? [3 marks]](https://www.doubtrix.com/uploads/editor/3319985072lRncLiohTY.jpg)
