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Transfer matrix about nonlinear network

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sonofsky

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If one circuit network contains some nonlinear devices, such as varactor diodes, can we still make use of the transfer matrix(ABCD matrix)?
 

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volker_muehlhaus

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The usual network matrices, including the ABCD matrix, are for linear operation. If you have nonlinear devices, each set of parameters is valid for small signal operation with a given bias point.

Recently, Agilent had introduced the non-linear X Parameters. These are an extension of S-parameters and add nonlinear terms.

https://en.wikipedia.org/wiki/X-parameters
 

pancho_hideboo

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sonofsky said:
If one circuit network contains some nonlinear devices, such as varactor diodes,
can we still make use of the transfer matrix(ABCD matrix)?
If your interest is a behavior of small signal around oeration point determined periodical large signal drive, you can use small signal matrix including frequency conversion effect.

If you use Cadence Spectre, use PSS/PSP or QPSS/QPSP.
If you use Agilent GoldenGate, use SSNA.

Here these analyses give you S-parameters including frequency conversion effects.
If you want to get chain-matrix(ABCD), convert this S-parameter to chain-matrix.

If you use Agilent ADSsim, invoke HB analysis with small signal.
Here you have to run two simulations to get {A,B,C,D}.

Also see the followings.
https://www.designers-guide.org/Forum/YaBB.pl?num=1239997125/1#1
 

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