VerilogA Model for Short-Interval Input

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VerilogA_Novice

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Hello, I have a difficulty in making verilog-A Model for short interval input event.

For example, Here is an and gate.

1. Propagation Delay=5ns

If there is an Input signal '1' when t=0~4ns,
Output must be 0 for all time because input signal '1' interval is shorter than the propagation delay(5ns)

but my model displays an output t=5ns~9ns

How can I make Verilog-A Model that have an immunity for short interval input ?

Help me TT
 

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