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wakuhuaco
Joined: 31 Mar 2008
Posts: 21
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 09 Mar 2009 22:35 a big problem |
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I have a big problem. I have to design a power amplifier and gave me the transistor FLU17XM, this transistor has no models. I am designing in class A, with 360 degrees of conduction. I have finished the design for maximum gain (conjugate matching). Now I want to try to build a linear model of the transistor, from the parameters s.
Anyone has this?
1) G. Dambrine, A. Cappy, F. Heliodoro, and E. Playez, "A new method for determining the FET small-signal equivalent circuit," IEEE Trans. Microwave Theory Tech, 36, no. 7, pp. 1151-59, July 1988.
2) D. Lovelace, J. Costa, and N. Camilleri, "Extracting small-signal model parameters of silicon MOSFET transistors," in IEEE MTT-S Int Microwave Symp. Dig., San Diego, CA, May 1994, pp. 865-868.
3) G. D. Vendelino, Design of Amplifiers and Oscillators by the S-parameter Method. New York, NY: John Wiley and Sons, 1982.
Some know more documentation?
Thank you very much
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shameemkabir
Joined: 31 Oct 2007
Posts: 389
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Location: Germany
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11 Mar 2009 10:20 Re: a big problem |
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1) G. Dambrine, A. Cappy, F. Heliodoro, and E. Playez, "A new method for determining the FET small-signal equivalent circuit," IEEE Trans. Microwave Theory Tech, 36, no. 7, pp. 1151-59, July 1988.
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shameemkabir
Joined: 31 Oct 2007
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11 Mar 2009 10:21 Re: a big problem |
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2) D. Lovelace, J. Costa, and N. Camilleri, "Extracting small-signal model parameters of silicon MOSFET transistors," in IEEE MTT-S Int Microwave Symp. Dig., San Diego, CA, May 1994, pp. 865-868.
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BigBoss
Joined: 17 Nov 2001
Posts: 1039
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Location: Earth
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11 Mar 2009 11:38 a big problem |
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It's not possible to extract a non-linear model from small signal parameters such as s-parameters.At least mathematically it's not possible.
Non-Linear behaviour is totally dependent on operating point, nonlinear response of the active device etc. and also it covers nonlinear parasitic components in intrinsic and extrinsic portion of the active device.
So, maybe only possible way to extract a "approximative" model is to measure the active device under certain conditions that is quite difficult at high frequencies.
But recently, Agilent has released X parameter definition that is s-parameters measured under high signal levels. In a limited manner, this can help you..
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kspalla
Joined: 19 Aug 2008
Posts: 848
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11 Mar 2009 13:23 a big problem |
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The transistor has the model. Get S-para from the link below.
http://www.eudyna.com/e/products_e/wireless_e/koufet/FLU17XM.pdf
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wakuhuaco
Joined: 31 Mar 2008
Posts: 21
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12 Mar 2009 3:41 a big problem |
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thank you very much for the advice. I will read about these new parameters. If design with s parameters, a class A amplifier, is very far from reality? (working below Pcomp).
Thx.
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vfone
Joined: 10 Oct 2001
Posts: 2327
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12 Mar 2009 6:35 Re: a big problem |
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| You can use low signal S-parameters for a class-A power amplifier which works below the compression point.
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