Teknik Dasar Listrik Telekomunikasi

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TEKNIK DASAR LISTRIK TELEKOMUNIKASI Gambar 12.29 Pita frekuensi penyaring lulus atas Secara matematis fungsi alih dari jaringan diatas adalah V Aj V IN j OUT j j 1 j RC (2.73) Numerator j Aj (2.74) Denumerato r 1 2 j 2 1 CR RC 1 2 1 A j 1 R C (2.75) 0 j num - den 90 - ATAN C R A (2.76) 168
TEKNIK DASAR LISTRIK TELEKOMUNIKASI Gambar 12.30 Tanggapan fasa penyaring R-C lulus atas orde satu Dalam bentuk transformasi laplace (s) R R C s s Aj (2.77) 1 1 s RC 1 R s s. C RC Contoh 1: Rencanakan penyaring R-C lulus atas bekerja pada frekuensi batas (f C) = 1000Hz pada -3dB. Tentukan besarnya kapasitor (C), bila diketahui resistor (R) = 15915. Penyelesaian: f C 1 2 R C 1 C 2 f C 1 R 2 1000Hz 15915 = 10nF Tabel 2.2 Tanggapan penguatan dan fasa penyaring lulus atas Penguatan (V) Penguatan (dB) Fasa ( o ) Frek. (Hz) 1 Tepat Tepat Pendekatan Tepat Pendekatan 2 1 ωCR 1 20log Fj A HF F F C - 20log F /F C o 90 - ATAN CR 10FC F 0,1F C o 90 45 0 log F / 0, 1F C 10 0.0100 -40.00 89.427 -40 90 20 0.0200 -33.98 88.854 -33.979 90 40 0.0400 -27.97 87.709 -27.959 90 80 0.0797 -21.97 85.426 -21.938 90 100 0.0995 -20.04 84.289 -20 90 200 0.1961 -14.15 78.690 -13.979 76.45 400 0.3714 -8.60 68.199 -7.9588 62.91 800 0.6247 -4.09 51.340 -1.9382 49.36 1000 0.7071 -3.01 45.000 0,00 45.00 169
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Teknik Dasar Listrik Telekomunikasi

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