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107 年 - 107 國立中山大學_碩士班招生考試_電機系(甲組):電子學#110217 

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1.(20%) Figure 1 shows a MOSFET circuit with the 62f5c820be97d.jpg=200 kΩ, RD = 2 kΩ, Rs = 1 kΩ, RL = 1 kΩ. The threshold voltage 62f5c85587062.jpg WIL of MOSFET are -1 V and 2 mA/V2 respectively. Neglect the channel length modulation effect. (a) Please find the DC drain current ID. (b) For AC analysis, please find the input resistance 62f5c890a38e6.jpg, output resistance62f5c8a79d42e.jpg and overall gain 62f5c8c53b97e.jpg (5%*4)


2.(20%) Figure 2 shows a BJT circuit with the 62f5c8ed6642d.jpg= 200 kΩ, RE = 5kΩ, Rc =2 kΩ, RL= 5 kΩ. The BJT has62f5c94fa5736.jpg0.7 V, β = 100, thermal voltage VT = 25 mV. Neglect the Early effect. (a) Please find the DC collector current Ic. (b) For AC analysis, please find the input resistance Rin, output resistance Rout and overall gain 62f5c97cab17a.jpg. (5%*4)


3.(30%) The amplifier shown in Fig. 3 has62f5c9bd03872.jpg =RL = 1 kΩ, Rc= 1 kΩ, RB = 47 kΩ. The BJT has62f5c9fa7864f.jpg 0.7 V, β= 100, Cμ = 0.8 pF, fT = 600 MHz, and thermal voltage VT = 25 mV. Assume the coupling capacitors to be very large. Neglect the Early effect. (a) Find the collector current of the transistor. (b) Find the overall gain vdvsig and the input resistance 62f5ca353c5b0.jpg at midband frequency. (c) Find the high frequency response fH. (5%,5%,10%,10%)


4.(30%) Consider the BiCMOS amplifier shown in Fig. 4 has62f5ca8103536.jpg= 100 kΩ, RG = 10 MΩ, Rs = 6.8 kΩ, Rc = 3kΩ, RL= 1 kΩ, CI= 0.1 μF, C2 = 1 μF. The BJT has62f5cb182996f.jpg 0.7 V, β = 200, Cμ = 0.8 pF, fT = 600 MHz, and thermal voltage VT= 25 mV. The MOSFET has 62f5cb5db3aca.jpg= 1 V, 62f5cb80895d9.jpg = 2 mA/V2, and62f5cbaa859a8.jpg= 1 pF. Neglect the Early effect and channel length modulation effect. (a) Consider the DC bias circuit. Neglect the base current of Q2 in determining the current in Q1. Find the DC drain current in Q1 and collector current in Q2. (b) Consider the circuit at low frequencies. Deternine the frequency of the poles due to C1 and C2. (c) Consider the circuit at higher frequencies. Use open-circuit time constants to estimate fH. (5%,5%,5%,5%,10%)




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107 年 - 107 國立中山大學_碩士班招生考試_電機系(甲組):電子學#110217-阿摩線上測驗

107 年 - 107 國立中山大學_碩士班招生考試_電機系(甲組):電子學#110217