For the common-base configuration of Fig. 5.165, determine re given RB = 6.8 k RC = 4.7 k alpha = 0.998, gos = 10 . The transistor is a PNP type. Assume VEB = 0.7 V and VT = 25 mV.

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: For the common-base configuration of Fig. 5.165:
Given: $R_B = 6.8 \, \text{k}\Omega$, $R_C = 4.7 \, \text{k}\Omega$, $\alpha = 0.998$, $g_{os} = 10 \, \mu\text{S}$.
The transistor is a PNP type (arrow points inward).
Assume $V_{EB} = 0.7 \, \text{V}$ for a silicon transistor and $V_T = 25 \, \text{mV}$ at room temperature.

a. Determine $r_e$