Consider the common-collector amplifier in the figure (bias circuitry ensures that...

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Consider the common-collector amplifier in the figure (bias circuitry ensures that the transistor operates in forward active region, but has been omitted for simplicity). Let I_C be the collector current, V_BE be the base-emitter voltage and V_T be the thermal voltage. Also, g_m and r_o are the small-signal trans-conductance and output resistance of the transistor, respectively. Which one of the following conditions ensures a nearly constant small signal voltage gain for a wide range of values of R_E?

A. g_m R_E << 1

B. I_C R_E >> V_T

C. g_m r_o >> 1

D. V_BE >> V_T

Answer: Option B

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