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> 95年 - 95 淡江大學 轉學考 電子學#56105
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
試卷資訊
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, R
i
=2kΩ, R
2
=kΩ,and nominal gain -R
2
/R
1
, 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,V
tn
= IV,(μ
n
C
ux
=50μA/V
2
, and W=5μm, Neglecl the channel lenglh modukuion and body eiTecl, find V
2
and l
1
【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 V
T
= kTlq = 25mV. Find the cic collect currenl and dc voltage Kc, and small-signal voltage gain V
o
/V
i
. [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 Q
1
operates as a CS amplifier and Q
2
as a CG amplifier. For proper operation, transistor Q
2
is required lo present a 50Ω resistance to the cable. That is, the inpul resislance of Q
2
is 50Ω. Assume llie transistors are well biased here. Whal must g
m2
be? What value of R
D
is required to provide 1V pulses at I he drain of Q
2
?