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Diode

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shijusisobhan

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I am trying to simulate a diode using a square wave. code is given below

*diode test
v1 1 0 pulse(0 5 1n 1n 1n 4m 10m)
D1 1 2 D1
.model D1 D()
R1 2 0 1k
.tran 1m 5m
.plot tran v(3)
.end

But when the diode at forward bias, output voltage changes many times. Then I simulate diode with sinusoidal signal, it works properly. Why did this happened and how can I eliminate this?
 

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