[試題] 100上 賴飛羆 數位電子與數位電路 期中考

[rod24574575 (天然呆)]

課程名稱︰數位電子與數位電路
課程性質︰必修
課程教師︰賴飛羆
開課學院：電資學院
開課系所︰資工系
考試日期（年月日）︰2011.11.10
考試時限（分鐘）：100分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）

試題：

1. Please find Thevenin and Norton equivalent circuits for the network in
   Fig.1 and explain what is the advantage of source transformation in detail.
   (30pts)

              3Ω                           3Ω      a
      ┌──﹏﹏﹏──┬─────┬───﹏﹏﹏──○
      │              │          │
      │              │+         │
     ╱╲             ︴         ╱╲
   ╱ ＋ ╲       6Ω ︴V_a    ╱ │ ╲ 3A
   ╲ － ╱           ︴       ╲ ↓ ╱
     ╲╱ 2V_a        │-        ╲╱
      │              │          │
      │              │          │                 b
      └───────┴─────┼────────○
                                ─┴─
                                  ￣
   Fig.1：http://i.imgur.com/BSFFn.jpg


2. A simple electronic thermometer based on the circuit shown as Fig.2 in which
   2 identical diodes are biased by current source I_1 and I_2. This simple but
   elegant circuit forms the heart of most of today's highly accurate
   electronic thermometers. Please try to explain in detail that why we prefer
   differential to single-ended. (15pts)

                      +V_cc
                    ○
                    │
          ┌────┴────┐
          │                  │
     I_1 ╱╲                ╱╲ I_2
       ╱ │ ╲            ╱ │ ╲
       ╲ ↓ ╱            ╲ ↓ ╱
         ╲╱                ╲╱
          │   +          -   │
          ├─○  V_PTAT  ○─┤
          │   +          +   │
        ┌┴┐              ┌┴┐
      D1 ╲╱ V_D1      V_D2 ╲╱ D2
        ─┼─              ─┼─
          │   -          -   │
          └────┬────┘
                  ─┴─
                    ￣
   Fig.2：http://i.imgur.com/ZRGUj.jpg


3. Please find the Q-point for the 3 diodes in Fig.3. Use the constant voltage
   drop model with V_on = 0.6V for the diodes. (15pts)

                          +10V
                        ○
                        │
                        ︴
                    R_1 ︴10kΩ
                        ︴
               D1 _     │     _ D2              D3 _
      A      │ ╱│    ↓I_1 │╲ │    C     │ ╱│
       ┌──┼◇ ├──┴──┤ ◇┼──┬──┼◇ ├──┐
    I_2↓    │ ╲│    B     │╱ │    ↓I_3 │ ╲│    │
       │         ￣          ￣         │         ￣  ─┴─
       ︴                                ︴               ￣
   R_2 ︴10kΩ                       R_3 ︴10kΩ
       ︴                                ︴
       │                                │
       ○                                ○
         -20V                              -10V

   Fig.3：http://i.imgur.com/BEVQz.jpg


4. (l) Please indicate the course teacher's name in Chinese. (5pts)
   (2) P|ease indicate the name of textbook and author(s). (5pts)

5. Please try to describe how to measure electronic charge in detail. (20pts)
   Q_e = -1.6 x l0^(-l9) Coulomb

6. (1) Fig.4 gives the electron and hole concentrations in a 2-μm-wide region
       of silicon. In addition, there is a constant electric field of 10^3 V/m
       present in the sample. What is the total current density at x = 0 ?
       What are the individual drift and diffusion components of the hole and
       electron current densities at x = lμm ?

       Assume that the electron and hole mobilities are 350 and 150 cm^2/V*s ,
       respectively. (15pts)

                       E
                    ←───
                 ▕          ▏
       1.01*10^18▕╲        ▏
                 ▕  ╲p(x)  ▏
                 ▕    ╲    ▏
           10^16 ▕╲    ╲  ▏
                 ▕  ╲    ╲▏
                 ▕    ╲    ▏10^18
                 ▕  n(x)╲  ▏
                 ▕        ╲▏
                 ▕          ▏10^4
                 ▕          ▏
                 x=0       x=2μm

       Fig.4：http://i.imgur.com/FgII2.jpg


   (2) A 10-μm-long block of p-type silicon has an acceptor doping profile
       given by N_A(x) = 10^14 + (10^8)exp(-10^4 x) , where x is measured in
       cm. Please try to demonstrate that the material must have a nonzero
       internal electric field E.
       What the value of E at x = 0 ? (15pts)


--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 218.167.192.128
※ 編輯: rod24574575     來自: 218.167.192.128      (11/11 05:56)
推 withinqality:圖超猛....
→ andy74139   :已收錄至資訊系精華區!!
推 bill8124    :水喔
推 glennchen   :好強
推 erodora     :推rod
推 coolboychiu :寫老師名字和課本名稱是哪招
→ coolboychiu :資工也要學電子電路歐
推 pp31630     :圖很厲害!!