Q5. Find the small signal gain
Consider the common-base amplifier shown below, where the output resistance r_o of the NPN BJT is drawn explicitly. Estimate the small signal gain v_{out}/v_{in} for this amplifier using the Miller's theorem. In your estimation assume r_o is large enough to allow the approximation v_{out}/v_{x} = g_m R_C when you apply Miller's theorem to simplify the circuit.

Question

Q5. Find the small signal gain 
 Consider the common-base amplifier shown below, where the output resistance   r_o  of the NPN BJT is drawn explicitly. Estimate the small signal gain   v_{out}/v_{in}  for this amplifier using the Miller's theorem. In your estimation assume   r_o  is large enough to allow the approximation   v_{out}/v_{x} = g_m R_C  when you apply Miller's theorem to simplify the circuit.

Answer

Gain =   g_m( R_C || (\frac{r_o g_m R_C}{g_mR_C - 1}) )	imes(\frac{1}{R_B}) 	imes (R_C + r_{\pi} + \frac{r_o}{1-g_m R_B} + \frac{1}{g_m})

Answer

Gain =   g_m( R_C || (\frac{r_o g_m R_C}{g_mR_C - 1}) )	imes(\frac{1}{R_B}) 	imes (R_B + r_{\pi} || \frac{r_o}{1-g_m R_C} || \frac{1}{g_m})

Answer

Gain =   g_m( R_C || (\frac{r_o g_m R_C}{g_mR_C - 1}) )	imes(\frac{1}{R_B}) 	imes (R_B || r_{\pi} || \frac{r_o}{1-g_m R_C} || \frac{1}{g_m})

Answer

Gain =   g_m( R_B || (\frac{r_o g_m R_C}{g_mR_C - 1}) )	imes(\frac{1}{R_C}) 	imes (R_B || r_{\pi} || \frac{r_o}{1-g_m R_C} || \frac{1}{g_m})

Answer

Gain =   g_m( R_C || (\frac{r_o g_m R_C}{g_mR_C - 1}) )	imes(R_B || r_{\pi} || \frac{r_o}{1-g_m R_C} || \frac{1}{g_m})

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Q5. Find the small signal gain Consider the common-base amplifier shown below,...

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