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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=0.98and
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.... .
