本帖最後由 yangtze 於 2012-8-21 12:50 AM 編輯 - z; f: h/ \# Q! Q
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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. W4 T) f4 Y- k o% [; J
To 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 4 @) t+ m# C3 c# s$ N; {
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Set up : .optio1n delmax + V- d/ T: ^" i5 S8 vThe value is 1/100 Ts .pls see Hspice manual ' A+ E ?) ~2 R! G, r7 OAC: it is same as open loop gain ac simulation,the step is smaller,for example: from 9Meg to 11Meg