B Assume A Noisy Circuit Is Connected To The Alternating Current Ac Power Mains In General The Ac Power Distributi 1 (47.43 KiB) Viewed 34 times
(b) Assume a noisy circuit is connected to the Alternating Current (AC) power mains. In general, the AC power distribution system could be described as an AC power source with a source resistance of 25 2. The noisy circuit might be modeled as a 5 source resistance noisy voltage source. A lowpass filter is added between the AC power mains and the noisy circuit to attenuate the noise from the noisy circuit to the AC power mains. Determine the filter attenuation characteristic using: (i) 0.1 µF shunt capacitor as a lowpass filter. (ii) 1 mH series inductor as a lowpass filter. (Note: You may use the Impedance Graph in Figure Q4(b)) (5 marks) (5 marks)
dBQ Q 100 100,000 94 86 80 74 66- 60 54- 46- 40 34 26 20 14- 6 O -6 -14 -20 -26 -34 -40 -46 -54 -60 I I I 10,000 1,000 100 10.0 1.0 0.1 0.01 0.001 1kHz 10kHz -10mF -ImF 10mH -100μF 10MHz 100kHz IMHz Figure Q4 (b):Impedance Graph 1mH -100µH 10µH 1µH 100nH 1pF HUOLA 10pF -1.00H -100pF 0.1nH -1000pl 0.01μF 0.1µF 100MHz 500MHz
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