Generally, engineer must consider Clone Printed Circuit Board Conductor Lost Effect, since the substrate pattern cross-sectional area is 100 μm, the DC resistance is about 172 Ω/m, and the MCM pattern cross-sectional area using the miniaturized wire is about 30 μm, but the DC impedance is as high as 573 Ω/m, assuming that the impedance of the wire pattern is 50 Ω.
Generally, the conductor loss of the substrate is 4.7 dB/m, and the conductor loss of the MCM is 15.2 dB/m. Therefore, the MCM with a pattern cross-sectional area of about 30 μm reduces the amplitude by 84% when the signal is transmitted at 10 cm.
Clone Printed Circuit Board Conductor Lost Effect
As the frequency increases, the wire skin effect of the circuit board is also more and more obvious in the process of Clone Printed Circuit Board Conductor Lost Effect. The wire pattern of the MCM is only a few μm, so the skin effect is less likely to occur.
The so-called skin effect means that as the frequency increases, the current will only concentrate on the surface of the conductor, causing current to flow in the conductor.
the skin depth is 3 μm at a frequency of 500 MHz, and the skin depth is 2 μm at 1 GHz, that is, the pattern thickness of the MCM is very close to the skin depth, whereas the pattern thickness of a general circuit board is about 40 μm, even if the thickness of the pattern, etc.
The price-thinning waveform is still degraded, so it is necessary to adopt a measure to increase the width of the pattern. However, increasing the width of the pattern violates the requirement of wire miniaturization.
