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# PSS/Transient Spectre/APS discrepancies

Last post Tue, Aug 21 2012 7:27 PM by rohan kr. 2 replies.
 Started by Steve Mikes 31 Jul 2012 02:16 PM. Topic has 2 replies and 1961 views
• #### Tue, Jul 31 2012 2:16 PM

PSS/Transient Spectre/APS discrepancies
 I'm running a simple circuit with PSS. I decided to compare the results to Transient, and found that they differ by a significant amount. My output amplitude is 783mV with PSS(spectre), 772mV with Transient, and 754mV with PSS(APS). I ran the transient out for a long time to make sure a steady state was reached. How do I know which is these 3 is the correct answer?Thanks,Steve
• Post Points: 35
• #### Mon, Aug 6 2012 5:03 AM

Re: PSS/Transient Spectre/APS discrepancies
• Post Points: 5
• #### Tue, Aug 21 2012 7:27 PM

• rohan kr
• Joined on Wed, Mar 28 2012
• Melbourne, Victoria
• Posts 10
• Points 110
Re: PSS/Transient Spectre/APS discrepancies
 I am facing the same problem with yours. I run PSS, SP transient analysis for my PA. At perfectly input/output matching condition, the gain of three cases should be approximately equal. But with transient simulation the gain is 5-6 dB lower than SP and PSS (SP and PSS results are correlated). When I change the integration method of transient simulation (gear, gear2, traponly, ...), the result also varies (output of PA varies from 150 mV ~ 700 mV). What simulation should be trusted?
• Post Points: 5