本帖最後由 yangtze 於 2012-8-21 12:50 AM 編輯 ( q0 q5 X) c- d, X! R! s a) G% z! J
Add a current pulse to your crystal model paralleled with the inductor to help start up. eg: I0 (ind+ ind-) isource type=sine ampl=200u sinephase=0 freq=10M damp=1e7 0 l' j3 `' Q z9 I, S! KTo check the open gain and phase use stb simulation in spectre(recommended). Or break the loop and run a ac simulation
本帖最後由 mike001 於 2012-9-3 01:11 PM 編輯 , S# }9 o, k9 A; K8 b! c& B: K( y! N- p8 d5 J/ h% i( g; n
Transient: - D# C& n5 W& gSet up : .optio1n delmax8 J0 j# K. Y* d( x
The value is 1/100 Ts .pls see Hspice manual 4 {$ t4 Q+ U$ x2 i- kAC: it is same as open loop gain ac simulation,the step is smaller,for example: from 9Meg to 11Meg