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95年 - 95 淡江大學 轉學考 電子學#56105

科目：轉學考-電子學 | 年份：95年 | 選擇題數：0 | 申論題數：5

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所屬科目：轉學考-電子學

選擇題 (0)

申論題 (5)

【已刪除】1. (20%) For an inverting amplifier, as shown in Fig. I，with open loop gain A=100, Ri=2kΩ, R2=kΩ,and nominal gain -R2/R1, find Ihe close loop gain in reality and the resulting gain error. [hinl: gain error .
（real gain - nominal gain)/nominal gain]
【已刪除】2. (20%) For the devices in the circuit of Fig. 2，Vtn= IV，（μnCux=50μA/V2, and W=5μm, Neglecl the channel lenglh modukuion and body eiTecl, find V2 and l1
【已刪除】3. (20%) As shown in Fig. 3; the BJT has a coniinon-eniiller current gain = 100，0.7V, and the (hermal voltage VT= kTlq = 25mV. Find the cic collect currenl and dc voltage Kc, and small-signal voltage gain Vo/Vi. [Hint: In the small signal analysis, the base current can be ignored]
【已刪除】4. 
【已刪除】5. (20%) The circuit of Fig. 5 utilizes two MOSFET's whose bias details are not shown and a 50Ω coaxial cable. Transistor Q1 operates as a CS amplifier and Q2 as a CG amplifier. For proper operation, transistor Q2 is required lo present a 50Ω resistance to the cable. That is, the inpul resislance of Q2 is 50Ω. Assume llie transistors are well biased here. Whal must gm2 be? What value of RD is required to provide 1V pulses at I he drain of Q2?