help about RF circuit simulation

[tenderne]

rf circuit simulation

hi all,

I got a basic question about RF circuit simulation, kindly give me some suggestion or just list some useful references. thanks a lot in advance.

suppose my circuit includes several parts, each part is represented by frquency domain [Y] matrix values. These parts are assembled into circuit, by connection with R, L, C. Now I want to analyze this assembled circuit, e.g. calculate the parameter, what kind of theory is applicable for the analysis? [Y],[Z], matrices, which one is better for circuit simulation?

Really have little knowledge about this kind of circuit analysis, any of your advice or recommended reading would be much appreciated.

regards,
tenderne

 

[tenderne]

radio frequency circuit simulation

pls....

 

[darcyrandall2004]

My opinion is that S parameters are useful for simulation and provide useful intuitive information.

There are equations available in the text on how to convert between the different two port network parameters. Personally I find When adding a component to my circuit I would work with the Z or Y parameters, whichever is easier. I would then convert to T parameters and work out the resultant matrix which is a multiplication of the orginal circuit matrix and the new addition components matrix. I would then convert the resultant matrix to S parameters.

If you are working with say matlab it is necessary to deal with two port networks. If you are using a decent circuit simulator then you can probably just forget about the Z, Y, T ... two port network matrices.

Cheers

 

[kayaoo]

If the circuits are small, I like list all the U/I equations and solve them using matlab's symbol math. The Final S matrix can also be calculated out if the equations between Ux, Ix and Sxx are included.

 

[tenderne]

Many thanks for all of your reply.

I don't intend to use any circuit simulator, actually my task is to develop a circuit simulator. size of the circuit is unknown, actually. :|

dear 'darcyrandall2004', would you please recommend some fundamental text books or references about RF circuit simulation? I am really rookie in this field... sigh...

 

[darcyrandall2004]

My Favourite is

Introduction to Radio Frequency design by Wes Hayward.

Its got a good section on two port networks but be wary of the mistake on page 172. Actually Tc = Ta*Tb.

From there you should progress to The design of CMOS radio frequency integrated circuits by Thomas.H.Lee

Complete Wireless Design by C.Sayre has some good circuit examples on PLLs I believe.

Possibly the design of amplifiers and oscillators by the S parameter method I thought provides some decent information on stability circles.

My belief is that the best approach is to put whatever you learn from the text into code ie Matlab. I believe it aids learning and then if you have written some code that say calculates the component values for a Pi Match then later down the track you can reuse this code over and over again.

Then I would recommend reading the online text and downloading the matlab samples from this guy, something J Orphanidis something along those lines, try googling him. I have seen him referenced in these forums.

 

[tenderne]

hi darcyrandall2004,

thank you so much for your reply, I really appreciate your kind help and patiences in answering my rookie questions. thank you very much again. God bless you.

regards,
tenderne