本帖最後由 yangtze 於 2012-8-21 12:50 AM 編輯 0 j7 }2 B3 N' E# i. Q( F* g4 W) n
" ` ?7 U7 H. F* HAdd 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 ; Z: p1 }# G3 L3 c3 o ]( @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 7 K) M( W7 i4 ]- h- c' C/ l3 e
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Set up : .optio1n delmax* l( W" }$ f' K' r4 W
The value is 1/100 Ts .pls see Hspice manual8 \! O# j3 c9 l
AC: it is same as open loop gain ac simulation,the step is smaller,for example: from 9Meg to 11Meg