One important property that measures the performance of the transistor in analog design is the current efficiency, which is the transconductrance per unit current (g_m/I_C for BJT and g_m/I_D for MOSFET). Usually we need large transconductance, but we want to spend small current because we want to save the energy of our battery. So the higher the current efficiency, the better.

At T = 266 K, the BJT current efficiency  (g_m/I_C) is equal to ..... S/A.