Hi,
We are characterizing the inverter IC SN74AHC1G00DCK for its response at 1GHz for the EMC purposes. I have made a PCB with a circuit for separation of 2.8mm between its input and output trace (50 ohm impedance trace) and another circuit for seperation of 7.2mm between its its input and output trace (50 ohm impedance trace) with 62mm long traces (Input and output traces). I am trying to characterizing this PCB (and hence the inverter IC, SN74AHC1G00DCK) in GTEM cell by connecting a 6cm wire at its input (equivalent of producing 1V at the input) for these two seperate configuration and seeing the behavior at ts output. I am also doing the simulation setup using TLM tool (alongwith its library component - IBIS model). While my simulation does not produce any amplitude at the IC output, the physical IC (IC on the board) produces an amplitude of 0.5V noise at low level. Because of the connecting wire at its output, the gate switches the logic at its output (from high to low) in 2.8mm configuration. And even with connecting wire at its output, the gate does not switch the logic at its output in 7.2mm configuration. Our simulation (simulation shows 0.1v amplitude noise at low level) shows the similar behavior except the 0.5v noise at low level. I want to know the coupling characteristics for the IC "SN74AHC1G00DCK" between its input and output. Can anyone help me in knowing the crosstalk characteristics between its input and output at 1GHz.
Regards,
Varindra
