QUESTION 8: The transistor parameters for the circuit shown in Figure

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QUESTION 8: The transistor parameters for the circuit shown in Figure P11.29 are β = 150, VBE( on ) = 0.7 V (except for Q4), VA = ∞ for Q1 and Q2, and VA = 145 V for Q3 and Q4. Earlier dc analysis yields quiescent values I1 = 0.5 mA and IQ = 140 μA. (a) Determine the common-mode input resistance, Ricm. (b) For RC = 75 kΩ, determine the common-mode voltage gain, Acm. rπ1 (kΩ) Format : 99.88 R2 (kΩ) Format : 0.5755 ro4 (MΩ) Format : 2.086 gm4 (mA/V) Format : 5.2938 Ricm (MΩ) Format : 276.7 Acm Format : −0.0383 Format : -0.0383 Figure P11.29

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QUESTION 8: The transistor parameters for the circuit shown in Figure P11.29 are

β = 150, V_{B E} (

on

) = 0.7 V

(except for

Q_{4}), V_{A} = \infty

for

Q_{1}

and

Q_{2}

, and

V_{A} = 145 V

for

Q_{3}

and

Q_{4}

. Earlier dc analysis yields quiescent values

I_{1} = 0.5 m A

and

I_{Q} = 140 μ A

. (a) Determine the common-mode input resistance,

R_{icm}

. (b) For

R_{C} = 75 k Ω

, determine the common-mode voltage gain,

A_{c m}

.

\begin{array}{lll} r_{π 1} (k Ω) & ◻ & Format : 99.88 \\ R_{2} (k Ω) & ◻ & Format : 0.5755 \\ r_{o 4} (M Ω) & ◻ & Format : 2.086 \\ g_{m 4} (m A / V) ◻ & ◻ Format : 5.2938 \\ R_{icm} (M Ω) & ◻ & Format : 276.7 \\ A_{c m} & ◻ & Format : - 0.0383 \end{array}

Format : -0.0383

Figure P11.29

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