UNIVERSITI SAINS MALAYSIA. Peperiksaan Semester Pertama Sidang Akademik 2011/2012. Januari 2012 EEE 241 ANALOG I. Masa : 3 jam

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UNIVERSITI SAINS MALAYSIA Peperiksaan Semester Pertama Sidang Akademik 2011/2012 Januari 2012 EEE 241 ANALOG I Masa : 3 jam ARAHAN KEPADA CALON: Sila pastikan bahawa kertas peperiksaan ini mengandungi LAPAN muka surat beserta Lampiran DUA mukasurat bercetak sebelum anda memulakan peperiksaan ini. Kertas soalan ini mengandungi ENAM soalan Jawab LIMA soalan. Mulakan jawapan anda untuk setiap soalan pada muka surat yang baru. Agihan markah bagi soalan diberikan disudut sebelah kanan soalan berkenaan. Jawab semua soalan di dalam Bahasa Malaysia atau Bahasa Inggeris atau kombinasi keduaduanya. Sekiranya terdapat sebarang percanggahan pada soalan peperiksaan, versi Bahasa Inggeris hendaklah diguna pakai. In the event of any discrepancies, the English version shall be used. 2/-

- 2 - [EEE 241] 1. (a) Terangkan fenomena berikut: Explain the following phenomenon: (i) pemodulatan panjang-saluran dalam MOSFET channel-length modulation in MOSFETs (4 markah/marks) (ii) kesan badan dalam MOSFET body effect in MOSFETs (4 markah/marks) Tentukan mod operasi NMOSFET dalam Rajah 1. Seterusnya, tentukan titik- Q (I D dan V DS ) bagi NMOS yang sama. K n = μ n C ox W/L = 250 μa/v 2 dan voltan ambang, V t = 1 V. Determine the mode of operation of the NMOSFET in Figure 1. Subsequently, determine the Q-point (ID and VDS) for the same NMOS. K n = μ n C ox W/L = 250 μa/v 2 and the threshold voltage, V t = 1 V. (12 markah/marks) I D R D 1.6 kω I G + V DS DC V DD 4 V + V GS - - Rajah 1 Figure 1 3/-

- 3 - [EEE 241] 2. (a) Merujuk kepada Rajah 2, nyatakan sama ada C 1,C 2 dan C 3 adalah kapasitor gandingan atau pirau. Apakah kegunaan kapasitor-kapasitor ini? Referring to Figure 2, state whether C 1, C 2 and C 3 are coupling or bypass capacitors. What are the applications of these capacitors? (6 markah/marks) Kirakan gandaan voltan bagi penguat pemancar- sepunya dalam Rajah 2 dengan dan tanpa kapasitor C 2, jika transistor mempunyai β o = 150, β F = 160, V T = 26 mv dan V BE = 0.7 V. Calculate the voltage gain of the common-emitter amplifier in Figure 2 with and without capacitor C 2, if the transistor has β o = 150, β F = 160, V T = 26 mv and V BE = 0.7 V. (14 markah/marks) Rajah 2 Figure 2 4/-

- 4 - [EEE 241] 3. (a) Kirakan rintangan luar bagi litar pemancar-sepunya Darlington seperti di dalam Rajah 3(a) dengan fungsi I BIAS. Jangan abaikan nilai bagi atau di dalam pengiraan ini, tetapi nilai an boleh diabaikan. Jika I C2 = 1 ma, cari nilai I BIAS = 1 ma, dan I BIAS = 0. Calculate the output resistance of the common-emitter Darlington transistor of Figure 3(a) as a function of I BIAS. Do not neglect either or in this calculation, but you can ignore and. If I C2 = 1 ma, find for I BIAS = 1 ma, and I BIAS = 0. c r o (14 markah/marks) Q 1 Q 2 I C2 I BIAS Rajah 3(a) Figure 3(a) Lukiskan litar setara isyarat kecil bagi penguat berbilang peringkat seperti di dalam Rajah 3. Buktikan bahawa transkonduktan, G M litar tersebut adalah kurang atau bersamaan dengan transkonduktan, g m1 bagi transistor M 1. 5/-

- 5 - [EEE 241] Draw the small-signal equivalent circuit for the MOS cascode circuit of Figure 3.Prove that the transconductance, G M of that circuit is less than or equal to transconductance, g m1 of transistor M 1. (6 markah/marks) M 2 Ro + R D Vo - + Vi - M 1 DC DC V DD V BIAS Rajah 3 Figure 3 4. Gandaan transonduktan ditunjukkan di Rajah 4. Parameter litar adalah C = 0.1 µf, Rs = 5 kω, Gvi = 20 ma/v, Ri = 500 kω dan Ro = 50 kω. Hitungkan. A low pass transconductance amplifier is shown in Figure 4. The circuit parameters are C = 0.1 µf, Rs = 5 kω, Gvi = 20 ma/v, Ri = 500 kω and Ro = 50 kω. Calculate : (a) Kadar gandaan satu jika RL = 1 kω. Unity Gain Bandwidth for RL = 1 kω. 6/-

- 6 - [EEE 241] Kadar gandaan satu jika RL = 10 kω. Unity Gain Bandwidth for RL = 10 kω. Rajah 4 Figure 4 5. Gandaan terbalik di Rajah 5 mempunyai R1 = 50 kω and R2 = R3 = 20 kω. Gandaan satu untuk operasi gandaan adalah fu = 1MHz dan kadar SR = 6 V/µs. The inverting amplifier shown in Figure 5 has R1 = 50 kω and R2 = R3 = 20 kω. The unity gain bandwidth of the op-amps is fu = 1MHz and the slew rate is SR = 6 V/µs. (a) Hitung nilai Rx yang memberi nilai ganda voltan Af = vo/vi = -10 V/V. Determine the value of Rx that will give a voltage gain of Af = vo/vi = -10 V/V. Hitung frekuensi maksima masukan V1 jika voltan keluaran terhad kepada 10 V Determine the maximum frequency fmax of the input V1 if the amplitude of the output voltage is limited 10 V. 7/-

- 7 - [EEE 241] Rajah 5 Figure 5 6. Gandaan CMOS ditunjukkan di Rajah 6. Parameter Vt = +2 V, VM = - 40V, dan VGS = + 4 V pada ID = 1 ma ; parameter PMOS are Vt = - 3V, VM = 40 V and VGS = -6V at ID = 1 ma. Hitungan A CMOS amplifier is shown in Figure 6. The parameters for the NMOS are Vt = +2 V, VM = - 40V, and VGS = + 4 V at ID = 1 ma ; the parameters for the PMOS are Vt = - 3V, VM = 40 V and VGS = -6V at ID = 1 ma. Calculate: (a) (c) Gandaan perbezaan. Differential Gain bagi NMOS Gandaan mod sepunya. Commonmode Gain. Mod sepunya nisbah penolakan. Common mode Rejection Ratio (CMRR). (5 markah/marks) (5 markah/marks) 8/-

- 8 - [EEE 241] Rajah 6 Figure 6 ooooooooo