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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