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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> Cadence Convergence Error https://designers-guide.org/forum/YaBB.pl?num=1280229946 Message started by mohammadreza on Jul 27th, 2010, 4:25am |
Title: Cadence Convergence Error Post by mohammadreza on Jul 27th, 2010, 4:25am I am simulating an RF Power Amplifier in Cadence, SpectreRF environment. I am controlling the supply current by a seperate voltage applied to a transistor. For some values that I choose, I face with convergence error, both in PSS and Transient. However, when I remove my mathcihng network and replace it by a real load value that I had designed, I face no errors. Is there any way for setting the options correctly so that I don't lose accuracy and have my expected result? I have tried the Moderate and ven liberal presets but the moderate one faces error as well and the liberal one is completely away. |
Title: Re: Cadence Convergence Error Post by mohammadreza on Jul 27th, 2010, 5:08am Thanks, I didn't see any HB-engine. Just shooting and flexible balance. I chose flexible balance and it worked. About the Q, since I need to operate between 2.4GHz and 2.49GHz, I chose 300. Is that fine? thanks |
Title: Re: Cadence Convergence Error Post by mohammadreza on Jul 27th, 2010, 5:29am thanks! decreasing the Q helped run the simulation successfully with the moderate accuracy. |
Title: Re: Cadence Convergence Error Post by pancho_hideboo on Jul 27th, 2010, 7:16am pancho_hideboo wrote on Jul 27th, 2010, 4:30am:
mohammadreza wrote on Jul 27th, 2010, 5:08am:
mohammadreza wrote on Jul 27th, 2010, 5:08am:
You have to have broad BW3dB which is far broader than 90MHz. So set Q lesser than 27. Also see the followings. http://www.designers-guide.org/Forum/YaBB.pl?num=1207009725/2#2 http://www.designers-guide.org/Forum/YaBB.pl?num=1278414763/18#18 mohammadreza wrote on Jul 27th, 2010, 5:29am:
For Q>=300, Shooting-Newton-PSS with accuracy of moderate can not converge. For Q<30, Shooting-Newton-PSS with accuracy of moderate can converge. For Q>=300, HB-PSS with accuracy of moderate can converge. For Q<30, HB-PSS with accuracy of moderate can converge. Are the aboves correct ? |
Title: Re: Cadence Convergence Error Post by mohammadreza on Jul 28th, 2010, 5:41am Yes, that's right |
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