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(Solved): Q3 [15 pts]: The effect of a power supply filter on the common-mode (CM) currents is sometimes chara ...



Q3 [15 pts]: The effect of a power supply filter on the common-mode (CM) currents is sometimes characterized by the CM impedance defined as

Zc=V(c)/(I)c

, with reference to Figure 3. If

L_(GW)=1mH

,

L=28mH,k=0.98

and

C_(CL)=C_(CR)=3300pF

, use LTSPICE to plot

Z_(C)

from 150 kHz to 30 MHz , and calculate the values of

Z_(c)

as these two frequency points. Repeat this for the differential-mode ( DM ) impedance

Z_(D)

with respect to Figure 4 using

C_(DR)=C_(DL)=0.1\mu F

. [Hint: you need to specify a source value, i.e. 1 mA and then find the corresponding voltage and their ratio to get the impedance.] Figure 3 Fig.... .



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