Mark Teacher 6 (10 cents) For the circuit shown as following, $\beta_1 \approx \beta_2 \approx 50$, $r_{be2} = 1k\Omega$. Please: (1) describe the function of emitter resistor $R_e$. (2) calculate the differential mode voltage gain($A_{ud}$). (3) calculate the differential mode input resistance ($r_{id}$)and output resistance ($r_{od}$) $+U_{cc}(+16V)$ $R_c$ $4k\Omega$ $+u_o -$ $R_c$ $4k\Omega$ $R_L$ $8k\Omega$ $R_w$ $100\Omega$ $u_{id1}$ $R_s$ $100\Omega$ $R_e$ $4k\Omega$ $R_s$ $100\Omega$ $-U_{EE}(-16V)$ $u_{id2}$
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The emitter resistor Re (4kΩ) provides negative feedback, which stabilizes the operating point of the differential amplifier against variations in transistor parameters and temperature changes. It also increases the input impedance of the circuit and helps Show more…
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Round 2
$*$ Repeat the previous problem for the case in which $R_{1}=50 \Omega, R_{2}=30 \Omega, R_{3}=15 \Omega,$ and $\varepsilon=120 \mathrm{V}$
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