Some information about the coupling

 　　From the circuit, capacitive bauer coupling can always be distinguished as driving power and driven load. If the load capacitance is relatively large, drive circuit’s charging the capacitor, discharge can complete signal jump.

　　When the rising along is steep, the current is relatively large, so that the driving current can absorb large supply current. Because the circuit inductance and resistance ( especially the chip pins inductance ) will rebound, the current relative to the normal case is actually a kind of noise, will affect the normal work of the previous stage. This is the coupling.

　　Decoupling refers to the power to take further filter measures to remove interference effect between two level signals through the power. The coupling constant is time constant, corresponding to the product between the bauer coupling capacitance value and the second level of the input impedance value.

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