*10.31 Figure P10.31 shows a diode-connected transistor with the bias circuit omitted. Utilizing the BJT high-frequency, hybrid-π model with ro = ∞, derive an expression for Zi(s) as a function of re and Cπ. Find the frequency at which the impedance has a phase angle of 45° for the case in which the BJT has fT = 400 MHz and the bias current is relatively high, so that Cπ ≫ Cμ. What is the frequency when the bias current is reduced so that Cπ Cμ? Assume α = 1.

*10.31 Figure P10.31 shows a diode-connected transistor with the bias circuit omitted. Utilizing the BJT high-frequency, hybrid-π model with ro = ∞, derive an expression for Zi(s) as a function of re and Cπ. Find the frequency at which the impedance has a phase angle of 45° for the case in which the BJT has fT = 400 MHz and the bias current is relatively high, so that Cπ ≫ Cμ. What is the frequency when the bias current is reduced so that Cπ Cμ? Assume α = 1.

*10.31 Figure P10.31 shows a diode-connected transistor with the bias circuit omitted. Utilizing the BJT high-frequency, hybrid-π model with ro = ∞, derive an expression for Zi(s) as a function of re and Cπ. Find the frequency at which the impedance has a phase angle of 45° for the case in which the BJT has fT = 400 MHz and the bias current is relatively high, so that Cπ ≫ Cμ. What is the frequency when the bias current is reduced so that Cπ Cμ? Assume α = 1.

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