kDaniu
Junior Member level 3
pre post simulation
hello all
I have some strange results in post-layout hspice simulation and can not understand the problem. maybe you know more about ...
so, f,e, I have a simple ring oscillator
when I making a hspice simulation, the oscillation frequency is 7.8ns
but when I making the post-layout hspice simulation (of 'the same' ring oscillator) I have a 10.8ns oscillation period.
I understand, that difference between the simple (schematic) hspice simulation and post-layout hspice simulation in the nodes (last one take account the resistance and capacitance of interconnections, but why the period of oscillation changed so much (~30% ) ?
any ideas ?
thanks,
Dan
hello all
I have some strange results in post-layout hspice simulation and can not understand the problem. maybe you know more about ...
so, f,e, I have a simple ring oscillator
when I making a hspice simulation, the oscillation frequency is 7.8ns
but when I making the post-layout hspice simulation (of 'the same' ring oscillator) I have a 10.8ns oscillation period.
I understand, that difference between the simple (schematic) hspice simulation and post-layout hspice simulation in the nodes (last one take account the resistance and capacitance of interconnections, but why the period of oscillation changed so much (~30% ) ?
any ideas ?
thanks,
Dan