gure 1 illustrates a BJT amplifier with voltage gain of -115.  a) Identify the capacitors in Figure 1, whose influences are negligible when considering the frequency response over high frequency range of > 1MHz. Explain briefly the reason. b) Identify the capacitor that needs treatment using the principle of "Miller effect capacitance". Calculate the input and output capacitances. c) Determine the upper-cut off frequency of the circuit, which is due to the output of the network only

Design a common-emitter amplifier to provide a small-signal voltage gain of approximately -10. 1. Consider the circuit shown in Figure 1. Show the following calculations in your notebook: Calculate a value for Rc so that A, z –10 Calculate values for R1 and R2 so that the circuit is bias stable and near the center of the load line. (Note: Use the datasheet for the 2N5209 transistor to make your calculations more accurate). Vcc = 10 V R1 Rc Cc2 Cci RL Vs R, REj = 499 Q Figure 1: Common-emitter amplifier for part #1

In transistor amplifier design, a by-pass capacitor is connected across the emitter resistor, RE, to effectively short out the emitter resistor at signal frequencies. This design improves the gain of the transistor for the desired ac signals. The circuit as shown in (a) is a common-emitter amplifier. The shaded portion is a low-frequency model of the transistor in use. In this problem, the task is to design a proper by-pass capacitor so that there is a pole at s = -300 rad/s. Reduce the circuit to its Thévenin equivalent as shown in (b) and then select the proper capacitor. Rs = 10 K0, R₂ = 2 KQ, RE = 3.3 kQ, R₂ = 1 k0, and 6 = 70. ww Rs Vs(1) www RE iB(1) +Vy(s) (a) ZT(S) M vc(1) Big(1) + RL CE

Q1) For the identical stages RC coupled amplifier cct. below, where re=28.480" a. Determine the value of voltage gain for each stage and overall voltage gain for cct. b. Determine fis, fic, and E for each stage. c. Determine the low cutoff frequency for the overall cct. e. Sketch approximately the low frequency response for the amplifier overall 0.47 14 V 5pF C-12 pF 8 pF C 40 pF 8 pF C C-8 p 5pF C = 8pF C 12pF 40 pF C-8 p 5.6 kQ 5.6 k 5.6 kQ 68 kn 0.47 F Vol 0.47 F Vo2 0.47 F Vo B-120 B-120 B-120 8.7k 8.7k 8.7km 10 kn 1.2 kn 20µF 1.2 km 20µF 1.2 km 20µF Q2) For the identical stages RC coupled amplifier circuit demonstrated in Q1 above, where Cwi=5 pF, Cwo = 8 pF, Cbc = 12pF, Cbe = 40 pF, and Cce = 8 pF a. Determine fand fo for each stage b. Determine the high cutoff frequency for the overall cct. c. Determine the unity-gain frequency for the circuit overall. d. Sketch approximately the high frequency response for the amplifier overall