Question

8.71. The arrangement shown in Fig. 8.69 incorporates an op amp to \"linearize\" a common-emitter stage. Assume $I_{s,Q1} = 5 \times 10^{-16}$ A, and $\beta = 100$. (a) Explain why the small-signal gain of the circuit approaches $R_C/R_E$ if the gain of the op amp is very high. (Hint: $V_X \approx V_{in}$.) (b) Plot the input/output characteristic of the circuit for $0.1 \text{ V} < V_{in} < 0.2 \text{ V}$ and an op amp gain of 100. (c) Subtract $V_{out} = 5 V_{in}$ (e.g., using a voltage-dependent voltage source) from the input/output characteristic and determine the maximum error. +\\ +\\ $V_{in}$\\X\\$V_{cc} = 2.5 \text{ V}$\\$500 \Omega$ \\$Q_1$\\$V_{out}$\\$100 \Omega$

          8.71. The arrangement shown in Fig. 8.69 incorporates an op amp to \"linearize\" a common-emitter stage. Assume $I_{s,Q1} = 5 \times 10^{-16}$ A, and $\beta = 100$.
(a) Explain why the small-signal gain of the circuit approaches $R_C/R_E$ if the gain of the op amp is very high. (Hint: $V_X \approx V_{in}$.)
(b) Plot the input/output characteristic of the circuit for $0.1 \text{ V} < V_{in} < 0.2 \text{ V}$ and an op amp gain of 100.
(c) Subtract $V_{out} = 5 V_{in}$ (e.g., using a voltage-dependent voltage source) from the input/output characteristic and determine the maximum error.
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$V_{in}$\\X\\$V_{cc} = 2.5 \text{ V}$\\$500 \Omega$ \\$Q_1$\\$V_{out}$\\$100 \Omega$

8.71. The arrangement shown in Fig. 8.69 incorporates an op amp to l̈inearizeä common-emitter stage. Assume Is,Q1 = 5 × 10^-16 A, and β = 100.
(a) Explain why the small-signal gain of the circuit approaches RC/RE if the gain of the op amp is very high. (Hint: VX ≈ Vin.)
(b) Plot the input/output characteristic of the circuit for 0.1 V < Vin < 0.2 V and an op amp gain of 100.
(c) Subtract Vout = 5 Vin (e.g., using a voltage-dependent voltage source) from the input/output characteristic and determine the maximum error.
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Vin
X
Vcc = 2.5 V
500 Ω
Q1
Vout
100 Ω

Added by Nieves V.

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