haribabu
Junior Member level 2
Hi,
Can anyone suggest me on the hspice options required for running closed loop crystal oscillator simulations ? ... The reason for asking the above question is that even though the negative resistance of the circuit is about 1.5 times the crystal resistance, I do not see any oscillations at the output. But if i make negative resistance to be 1.8 times, then i see oscillations at the output which increases my power consumption by 20%. I suspect my hspice options for the above increase in power . I am using the following hspice options
.option accurate post=1 gmindc=1e-12 method=trap puretp
Please suggest any methods to improve the simulator accuracy so that it produces oscillations even if my negative resistance is < 1.8 times that of crystal . Ideally oscillations should be produced when negative resistance = crystal resitance. To have a margin i have taken my negative resistance to be 1.5 times .
Thanks
Hari .
Can anyone suggest me on the hspice options required for running closed loop crystal oscillator simulations ? ... The reason for asking the above question is that even though the negative resistance of the circuit is about 1.5 times the crystal resistance, I do not see any oscillations at the output. But if i make negative resistance to be 1.8 times, then i see oscillations at the output which increases my power consumption by 20%. I suspect my hspice options for the above increase in power . I am using the following hspice options
.option accurate post=1 gmindc=1e-12 method=trap puretp
Please suggest any methods to improve the simulator accuracy so that it produces oscillations even if my negative resistance is < 1.8 times that of crystal . Ideally oscillations should be produced when negative resistance = crystal resitance. To have a margin i have taken my negative resistance to be 1.5 times .
Thanks
Hari .