UNIVERSITI SAINS MALAYSIA EEE 241 ELEKTRONIK ANALOG I

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UNIVERSITI SAINS MALAYSIA Peperiksaan Semester Pertama Sidang Akademik 2009/2010 November 2009 EEE 241 ELEKTRONIK ANALOG I Masa : 3 Jam Sila pastikan bahawa kertas peperiksaan ini mengandungi LAPAN muka surat 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 setiap soalan diberikan di sudut sebelah kanan soalan berkenaan. Jawab semua soalan dalam Bahasa Malaysia atau Bahasa Inggeris atau kombinasi kedua-duanya. [Sekiranya terdapat sebarang percanggahan pada soalan peperiksaan, versi Bahasa Inggeris hendaklah diguna pakai]. 2/-

- 2 - [EEE 241] 1. (a) Buktikan bahawa frekuensi peralihan bagi satu BJT ialah Prove that the transition frequency of a BJT is f T n 2 2 W 2 B V T dan bagi satu MOSFET ialah and for a MOSFET is n f 1.5 2 V V L T 2 GS t Komen tentang persamaan dan perbezaan kedua-dua persamaan ini. Peranti manakah yang selalunya mempunyai f T yang lebih tinggi dan kenapa? Comment on the similarity and difference between these two expressions. Which device is normally having a higher f T and why? Lakarkan litar setara isyarat kecil BJT dan kirakan nilai setiap elemen dalam litar tersebut pada I C = 0.2 ma, V CB = 3 V, V CS = 4 V. Parameterparameter peranti adalah C je0 = 20 ff, C μ0 = 10 ff, C cs0 = 20 ff, o = 100, F = 15 ps, = 10-3, r b = 200, r c = 100, r ex = 4, dan r μ = 5 o r o. Anggap bahawa keupayaan terbina dalaman dalam keadaan seimbang, ψ o, ialah 0.55 V bagi semua simpang. Sketch the complete small signal equivalent circuit for a bipolar transistor and calculate the value of each element at I C = 0.2 ma, V CB = 3 V, V CS = 4 V. Device parameters are C je0 = 20 ff, C μ0 = 10 ff, C cs0 = 20 ff, o = 100, F = 15 ps, = 10-3, r b = 200, r c = 100, r ex = 4, and r μ = 5 o r o. Assume the built-in potential in equilibrium, ψ o, is 0.55 V for all junctions. 3/-

- 3 - [EEE 241] 2. (a) Kirakan gandaan voltan keseluruhan (v o /v i ), rintangan masukan (R i ) dan rintangan keluaran (R o ) bagi satu penguat tapak-sepunya seperti yang ditunjukkan dalam Rajah 1. Diberikan : α o = 1, F = 100, V BE = 0.6 V, V A = 50 V dan V T = 26 mv. Calculate the overall voltage gain (v o /v i ), input resistance (R i ) and output resistance (R o ) for the common-base amplifier shown in Figure 1. Given: α o = 1, F = 100, V BE = 0.6 V, V A = 50 V and V T = 26 mv. (70 marks) Tunjukkan setiap langkah dalam menjanakan satu model-t daripada model hibrid- satu konfigurasi penguat tapak-sepunya pada frekuensi rendah. Show detailed steps on the generation of T-model from the hybrid- model of the common-base amplifier configuration at low frequency. (30 marks) V CC R 2 300 k R C 22 k C 3 C 1 Rs R 3 100 k + vo C R 2 1 160 k R 6 13 k 2 k Ro + v i R i Rajah 1 Figure 1 4/-

- 4 - [EEE 241] 3. (a) Reka satu penguat (iaitu, tentukan R G, R S, V DD dan V SS ) dengan skematiknya ditunjukkan dalam Rajah 2 untuk menghasilkan rintangan masukan (R i ) 20 M dan gandaan keseluruhan (v o /v i ) 0.95 apabila litar ini memacu satu beban luaran (R L ) 3 k. Operasi litar ialah bagi frekuensi rendah dan sederhana. Design an amplifier (i.e. determine R G, R S, V DD and V SS ) with a schematic shown in Figure 2 to give an input resistance (R i ) of 20 M and an overall gain (v o /v i ) of 0.95 when driving an external load (R L ) of 3 k. The operation of the circuit is for low to medium frequency. Diberikan: Given: K = μ n C ox W/L = 20 ma/v 2 Arus salir, I D = 5 ma Drain current, I D = 5 ma Voltan ambang NMOS, V t = 1.5 V NMOS threshold voltage, V t = 1.5 V V DS = 3.5 V (70 marks) 5/-

- 5 - [EEE 241] Nyatakan kesan perintang penyahjanaan sumber ke atas transkonduktans satu litar penguat sumber sepunya. Tunjukkan terbitanterbitan untuk mengesahkan kenyataan anda itu. State the effect of source degeneration resistor on the transconductance of a common-source amplifier circuit. Show derivations to verify your statement. (30 marks) V DD + v i C 1 D G S R G C 2 Rs R L + vo V SS - R i Rajah 2 Figure 2 6/-

- 6 - [EEE 241] 4. (a) Merujuk Rajah 3(a), dapatkan nisbah gm1 kepada gm2. Refer to Figure 3(a), find the ratio of gm1 over gm2. MN1 MN2 Rajah 3(a) Figure 3(a) Dapatkan persamaan isyarat kecil gandaan voltan di dalam Rajah 3. Find small signal gain in Figure 3. Rajah 3 Figure 3 7/-

- 7 - [EEE 241] Rajah 4 Figure 4 5. Rujuk Rajah 4. Refer to Figure 4. (a) Cari kapasitor di VOUT. Find total associated capacitance at VOUT. (25 marks) Dapatkan persamaan gandaan VOUT/(VIN + -VIN - ) untuk frekuensi tinggi. Find high frequency gain expression of VOUT/(VIN + -VIN - ). (75 marks) 8/-

- 8 - [EEE 241] 6. Rujuk Rajah 5. Refer to Figure 5. Rajah 5 Figure 5 (a) Dapatkan persamaan ralat gandaan pecahan bagi konfigurasi litar tertutup tak terbalik. Derive from closed loop noninverting configuration, the fractional gain error. Jika litar tertutup mempunyai gandaan 200 dan litar tak tertutup mempunyai gandaan setinggi 80 db, kirakan ralat pecahan. If closed loop gain is 200 and open loop gain is 80 db, calculate the fractional error. ooooooooo