Find net voltage gain, given hfe = 50 and hie = 1kΩ.(a) 27.68(b) -22(c) 30.55(d) -27.68This question was addressed to me by my school principal while I was bunking the class.This intriguing question comes from Low Frequency Response and Miller Effect Capacitance topic in section Transistor Frequency Response of Analog Circuits

Find net voltage gain, given hfe = 50 and hie = 1kΩ.(a) 27.68(b) -22(

1.	Find net voltage gain, given hfe = 50 and hie = 1kΩ.(a) 27.68(b) -22(c) 30.55(d) -27.68This question was addressed to me by my school principal while I was bunking the class.This intriguing question comes from Low Frequency Response and Miller Effect Capacitance topic in section Transistor Frequency Response of Analog Circuits
Answer» Correct OPTION is (d) -27.68 Explanation: Apply millers THEOREM to RESISTANCE between input and output. At input, RM=100k/1-K = RI Output, RN=100k/1-K^-1 ≈ 100k Internal voltage gain , K = -hfeRL’/hie K = – 50xRc\|\|100k/1k = – 50x4x100/104 = – 192 RI = 100k/1+192 = 0.51kΩ RI’ = RI\|\|hie = 0.51k\|\|1k = 0.51×1/1.51 = 0.337kΩ Net voltage gain = K.RI’/RS+RI’ = – 192 x 0.337/2k + 0.337k = -27.68.

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