An RF amplifier is composed of a cascade of two amplifier devices. The first has a power gain of 190W/W. The second has a power gain of 100W/W. What is the overall power gain of the cascade in dB (to two decimal places)

4. If Vcc = 20 V, Rc is 440, R1 is 1500, R2 is 800, R3 is 6500, Re is 1000 and beta is 175; determine the cutoff and saturation values for an amplified signal, whose original value is 250 mV. Consider the minimization of the effects of r for the circuit Vcc www R3 ww www R₁ R₂ www Rc RE

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

Figure 2 shows a typical BJT amplifier, with its parasitic capacitances displayed. The current gain of the transistor is B=150 and the voltage gain of the amplifier is Am =-125. The small signal resistances of the transistor are re =16 ohm and r0 = infinity, respectively. The values of resistors and capacitors in the figure are: R1 =80 kohm, R2 =20 Kohm, Rc = 2 Kohm, RE = 2 Kohm, Rs =50 W, RI=5 kohm, Cs=2 uF, Cc=2 uF, Ce =10 uF, Cbc =4 pF, Cbe = 10 pF, Cce =1 pF, Cwi = 4 pF, CWO = 9 pF, and Vcc = 20 V. a) Sketch a simplified circuit diagram of Figure 2 for high frequency analysis. b) Using the concept of "Miller effect capacitance", calculate the input and Output Miller effect capacitances of Figure 2, respectively. C) Determine the upper cut-off frequency of Figure 2 that is imposed by its input network only. d) Explain briefly the possible ways to increase the upper cut-off frequencv of this amplifier.