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(ELEC102)final_pastb.pdf
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Given VT =1V
K = 0.25mA/V2
2
Find VDSand IDSfor VG = 3.5V
Text Box: MOS is in saturation mode
4
5
(26)
Text Box: GivenVT = 1VK = 0.5mA/V2
Text Box: hence VO = 3 + 1 = 4V VDS = 12 V = VDD is impossible since MOS is not cut off (VDGS > VT)
Text Box: NMOS is in triode since1. VGS > VT 2. VDS < VGS - VT
Text Box: 5. In the circuit, find VO . State clearly the reasons for your answer. Given VT = 1V, K = 0.5mA/V2 . Given th
Text Box: NMOS is triode since1. 6 > 12. 1 < 6 - 1
8
Text Box: 8. A BJT with the following IC-VCE characteristics is used in the following circuit. (a) Sketch the load line VCE
(8)
(34)
Text Box: Q
Text Box: Estimate current and voltage gain
vout= vCE
vin
RB
RC
(15)
Text Box: 10k..
Text Box: c
9
(30)
Text Box: 9. Given the BJT circuit.Given that IB is about 1.57mA. Show that the BJT is in saturation. Hence show that the fo
Hence V3 = -16V
11
-2V
D
+ V3 -
(15)
Text Box: V2
Text Box: 11. (a) In the ideal diode circuit, find V3 and sketch V2(t). (15)
Text Box: Hence V2 = V1 + V3 = V1 - 16V
Text Box: 14V
(20)
(6)
11
Text Box: Vi > 5V, D1 and D2 ON,
Text Box: (b) In the ideal diode circuit, plot Vo versus Vi for -10V .TVi .T 10V. Show clearly all voltages in your sketch.
Text Box: Vi < 5V, D1 OFF and D2 ON
VZO = 7V
rZ = 5.
12
(35)
13
|G|
(38)
Text Box: 13. Given the filter circuit. The op amp is ideal.(a) Obtain the complex transfer function G (=Vo/Vi) in terms of j
Text Box: a
(36)
15
Text Box: 15. In the following LCR circuit, (a) find the resonant frequency (in rad/s and in Hz), Q-factor , bandwidth, upper
Text Box: If i is 2mA rms
Text Box: b