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# (Solved): QI Circuit parumettro $$R_{\text {sig }}=400 \Omega$$ $$R_{1}=180 \mathrm{k} \Omega$$ $$R_{2}= ... QI Circuit parumettro \( R_{\text {sig }}=400 \Omega$$ $$R_{1}=180 \mathrm{k} \Omega$$ $$R_{2}=40 \mathrm{k} \Omega$$ $$R_{C}=4 \mathrm{k} \Omega$$ $$R_{E}=1 \mathrm{k} \Omega$$ $$R_{L}=40 \mathrm{k} \Omega$$ The cupacitors $$C_{c_{1}}, C_{c_{2}} \times C_{E}$$ are assumal to be large. $$\beta=800$$ For the curcuit given above, $$V_{B E}=0.7 \mathrm{~V}$$ $$V_{C C}=30 \mathrm{~V}$$ a-) Draw the $$O C$$ equivalent circuit and calculate the bias points. Find $$I_{C}, V_{C E}, I_{E}$$ and $$I_{B}$$. Show that the circut is in ACTWE mode. b) Find $$A C$$ model parumetos $$\left(r_{\pi}, r_{e}, g_{m}\right)$$ c) Draw the small signd eqj valent model. Replace the trossistor with it equivalent nodel. d) Calculate the inpot and ortput impedace of the amplifier e-) Calculate everall gain of the amplifier $$G_{v}=\frac{v_{0}}{v_{\text {siv }}}$$

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