[SI-LIST] Re: How to do crystal simulation

Hi David and Haixiao
   
  Thank you! 
  I just got the crystal internal circuit.  It's  L. C. R in serial and 
parallel with a C.
  I will have a try in Hspice with a initialized capacitor or inductor. 
  The outside circuit is two capacitor( both of them is about 22ps) connected 
crystal's output and input with a R(1Mohm) in parallel.
   I don't have ADS tool. So I can't use it. If necessory I will release the 
Hspice simulation script tomorrow night. Then you can see the electrical 
circuit clearly.
  I'm not sure whether it can run or not. 
   
   
  

"Pommerenke, David" <davidjp@xxxxxxx> дµÀ£º
    Li,

Your attached file was not delivered, but normally I just set initial 
conditions on the capacitor or the inductor that is part of the XTAL model.


Dr. David Pommerenke
Missouri University of Science and Technology (MST), former name: UMR
118 EECH, 301 W. 16th Street, Rolla, MO 65409-0040
573 341 4531, cell: 573 308 2019


   
  Did you add stimulus to start the spice simulation? For example, a
1ns pulse.
ADS has more choice on crystal simulation. Check the ADS help on
oscillators.

Regards,
Haixiao


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of ? ?
Sent: Tuesday, June 17, 2008 8:35 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] How to do crystal simulation

Hi all,

I have a problem with crystal simulation. Please check the attached. I can't 
get the crystal start to "shake". The frequency I want to get is 25MHz. I 
didn't get the internal circuit for crystal. The Pspice model seems didn't 
work. What shall I do?







       
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