課程名稱︰電子學 課程性質︰選修 課程教師︰李佳翰 開課學院：工學院 開課系所︰工科海洋系 考試日期（年月日）︰2010/05/24 考試時限（分鐘）：160min 是否需發放獎勵金：是 （如未明確表示，則不予發放） 試題 : 總分: 125分 Unless otherwise noded, asume all diodes have ON voltage of 0.7V and all MOSFETs have the following parameters: μoCox=1mA/V^2 ,λ=0.05, and Vm=-Vtp=1V. Please show your work. Partial credits will be given. 1.(30分) Please find the opearting region (cut-off,saturation, or triode) of the following circuits. [Please show your work leading to the answer.] 5V 5V 5V 5V 5V 5V ┬ ┬ ┬ ┬ ┬ ┬ │ │ │ │ │ │ ▽ ︴10kΩ ︴10kΩ ︴10kΩ ︴10kΩ ︴10kΩ │ │ │ │ │ │ ▽ │ │ │ │ │ │ │├←┘ │ │├─┘ │ │├←┘ ├─┤│ 10/1 ├─┤│ 10/1 ├─┤│ 10/1 │ │├─┐ △ │├→┐ △ │├─┐ ︴10kΩ │ │ │ │ │ │ │ △ │ △ ▽ │ │ │ │ │ │ ≡ ≡ ≡ ≡ ≡ ≡ (a) (b) (c) ※(ps: 10/1 為 W/L的值，後面在MOSFET旁出現的比例皆為相同意思) 2.(15分) Please find the small-signal equivalent resistance of the following circuit. 5V ┬ ╭┴╮ │↓│1mA ╰┬╯ │ ├──o │ ←─┐ ┌───┤ │ │ │ │ ││├─┘ Req └┤│ 100/1 │├→┐ │ │ ≡ 3.(40分) For the following trans-resistance amplifier circuit, please (a) find the DC operating point of the transistor (Ids & Vgs, neglect λ for DC.) (b) calculate the small signal parameters (gm & ro) and plot the small-signal equivalent circuit, (c) find the small-signal gain (Vout/Iin), Rin and Rout. [note: Iin is a small-signal current source.] 5V ┬ │ ︴100kΩ 100kΩ │ ┌─﹏──┼───╫─────┬─o Vout │ │ C∞ ←┐ │ │ │├─┘ │ ︴10kΩ ┌──┬─────╫──┴─┤│ 100/1 Rout │ │ │ ┌→ C∞ │├→┐ │ ╭┴╮ ︴50Ω │ │ ≡ ↑│～│ │ Rin │ Iin╰┬╯ │ │ │ │ │ ≡ ≡ ≡ 4.(40分) For the following circuit, please (a) find the DC operating point of the transistor (Ids & Vgs), (b) find the transconductance (gm) and plot the small-signal equivalent circuit, (c) find the small-signal gain (Vout/Vin), Rin, and Rout. [assume λ=0] 5V ┬ │ ╭┴╮ │↓│0.2mA Rout ╰┬╯ │ 1kΩ │ 100/1 ←─┘ +┌───﹏───╫──┴─┐ ┌───┬──╫───┬──o Vout ╭┴╮ ┌→ C∞ ↓ │ │ C∞ │ Vin│～│ │ ┴─┴ ︴1kΩ ︴1kΩ ╰┬╯ Rin ─┬─ │ │ -│ │ │ │ │ │ │ │ ≡ ≡ ≡ ≡ --

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