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Cadence ADE L can't simulate output for longer simulation time.

Anklon

I'm trying to design a 10MHz clock in virtuoso. But when I'm using ADE L for transient simulation, output graph do not show proper result depending on simulation time and this simulation time. for higher simulation time,  it provides different result. For example, this is the output graph for "transient 0 1.1u moderate" simulation of my circuit:

near end, output pulse swing between 1.6V to -1.7V (approximately) volt. So to see the output pulse better, I raise simulation time to 1.5u. Now, for " transient 0 1.5u moderate" simulation, output graph is:

not only output graph is distorted , look at the output magnitude , its within mV range. in 1u to 1.1u range, there is no pulse. Where did the pulse go ??  

Could you please, explain me why my simulator acting like this? I'm sure, it has no relation with my circuit as I'm simulating same circuit for different time range. Is there any kind of restriction or settings problem? 

thanks 

Parents
  • It should not be necessary to manipulate the step size settings to make your circuit simulation work. I guess your oscillator has a hard time to get started. Better try something else, like ramping up the power source or set some initial conditions/node sets on your devices.
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  • It should not be necessary to manipulate the step size settings to make your circuit simulation work. I guess your oscillator has a hard time to get started. Better try something else, like ramping up the power source or set some initial conditions/node sets on your devices.
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