Q4 A A Copper Barrier With A Thickness Of 0 1 Mm Ur 1 R 1 O 5 8 107 S M Will Be Used As An Enclosure To Shi 1 (149.44 KiB) Viewed 41 times
Q4 (a) A copper barrier with a thickness of 0.1 mm (ur = 1, &r=1, o = 5.8 × 107 S/m) will be used as an enclosure to shield a 1 MHz digital circuit. Compute the skin depth and total loss (reflection loss plus absorption loss plus multiple reflection loss) in decibels. Assuming that the field incident on the barrier is a far-field source, the effect of enclosure openings can be neglected. (10 marks) CONFIDENTIAL (b) 3 MEP10203 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. CONFIDENTIAL (Note: You may use the Impedance Graph in Figure 04(b)) (5 marks) (5 marks)
dBQ Ω 100 100,000 94 86 80 74 66 60 54 46 40 34 26 20 14 6 0 -6 -14 -20 -26 -34 -40 -46 -54 -60 1 10,000 1,000 100 10.0 1.0 0.1 0.01 0.001 1kHz 10kHz 100kHz 1MHz 10mH 1mH -100µH HOL 100nH 1μH 1pF 10nH -100pF -10pF -1000pl -10nh -0.1nH -0.01μF -0.1μF 10MHz 100MHz 500MHz
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