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7.85 An emitter follower with a BJT biased at I C = 2 mA and having β = 100 is connected between a source with R sig = 10 k and a load RL = 0.5 k. (a) Find Rin, vb/vsig, and vo/vsig. (b) If the signal amplitude across the base–emitter junction is to be limited to 10 mV, what is the corresponding amplitude of vsig and vo? (c) Find the open-circuit voltage gain Gv o and the output resistance R out. Use these values first to verify the value of G v obtained in (a), then to find the value of Gv obtained with R L reduced to 250 .