are the same with each other in inductance and the capacitors are the same with each other in capacitance as shown by equations 1 and 2 the total inductance l 5 and the total capacitance c 5 may be represented each in equations 3 and 4 for example assuming that in the memories 10 u02dc 40 the inductors l 1 u02dc l 4 have the same inductance 3 nh and the capacitors c 1 u02dc c 4 have the same conductance 3 pf the total inductance l 5 is 0 75 nh and the total capacitance c 5 is 12 pf putting l 5 and c 5 into equations 5 and 6 it can be obtained as follows an operating frequency of the test system with the memory shown in fig3 is 400 mhz whereas the resonant frequency is 1 65 ghz in the graph shown in fig4 in other words as a reflection wave becomes the smallest at the band of 1 65 ghz it is relatively larger at other frequency bands the reflection wave means a ratio of a received signal to a transmitted signal as a rate of the reflection wave is smaller a signal is transferred having a smaller loss thus if there is a large reflection wave in the operating frequency of the memory for example frequency bands other than the band at 1 65 ghz it deteriorates the signal identity on the operating frequency band according to.