所屬科目：【阿摩】未分類題庫
1. (10%) The open loop amplifier has infinite input impedance and infinite gain, derive the transfer function \( V{\mathrm{out}}(s) / V{\mathrm{in}}(s) \) of the circuit shown in Fig. 1.
2. (10%) Assume a diode has voltage drop \( V_{\mathrm{ON}} \) when it turns on. Plot the input/output characteristic of the circuit shown in Fig. 2. (Hint: input as x-axis and output as y-axis)
3. (10%) Explain the operational principles of the devices \( R{C} \) and \( R{E} \), \( C{1} \) and \( C{2} \) of the circuit shown in Fig. 3?
4. (10%) Ignoring the body effect and the short channel effect of the MOSFET, draw the low-frequency small-signal model and derive the low-frequency gain of the circuit shown in Fig. 4?
5. (10%) Derive the voltage across the resistor R4 shown in Fig. 5.
6. (10%) Derive the current on the resistor R3 shown in Fig. 6.
7. (10%) Capacitive reactance \( X{\mathrm{C}} \) and resistor R in parallel that is supplied by a sine wave voltage \( V{\mathrm{A}} \). Draw the signal waveforms of \( V{\mathrm{A}} \), branch currents \( I{\mathrm{R}} \) and \( I_{\mathrm{C}} \) by showing one cycle. (Fig. 7) (Hint: You must identify \( 90^{\circ} \), \( 180^{\circ} \), \( 270^{\circ} \), and \( 360^{\circ} \) in one cycle.)
8. (10%) Explain (a) channel length modulation of a MOSFET. (b) early effect of a BJT.
9. (10%) How much current is needed for a 24Ω resistor that dissipates 600 Watt?
10. (10%) Draw the Bode plot gain response of the transfer function \( A(s) = 10[(1 + (s / 10^3)] / [(1 + (s / 10^6))] \).
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