Question 3 Figure Q3 shows the signal amplification circuit using a BJT. Given the input signal vi = 50 mVpp, AC emitter resistance ré = 9.6 2 and forward amplification factor ẞ = 200. 15V V₁ AC 50 mVpp (a) R₁ 70 ΚΩΣ RS www C₁ HH 650 Q 0.1μF R₁ 30 kQ www Re 4.0 kQ C₁₂ REL 35Q 0.35 μF RL R₁₂ 1.5 ko 100 μF Figure Q3 ww R₁₂ 6.0 ΚΩ Recall the amplifier frequency response of BJT to determine the following parameters: (i) Lower critical frequency fel(input) due to input RC circuit. (6 marks) (ii) Lower critical frequency fel(output) due to output RC circuit. (3 marks) (iii) Lower critical frequency fel(bypass) due to bypass RC circuit. (8 marks) (b) Calculate the midband gain of the circuit in Figure Q3. (4 marks) (c) Explain what happens to the reactance of coupling capacitors C₁ and C3 in Figure Q3 during high frequency operation and their impact on the amplifier's frequency response. (4 marks)