Large signal S from small signal S

[gecky]

Hi,

is it possible to extract the large signal S-parameter from small-signal S in ADS?

In particular, I need the info for NE76184A. ADS has the non-linear model but how do i use it? As per a normal 2-port (after the appropriate DC biasing)?

Many Thanks!

 

[khouly]

design the bias circuit such that prevent the RF signal to be coupled to the DC path
use Rf choke and be sure that the DC signal is isloated
use block capacitors

and then u have the two port network of the transistor and simulate with LSSP not S Param
thats it

khouly

 

[gecky]

Hi Khouly,

Thanks! This is for my DRO.... so will it be right for me to say that if I design the gamma looking towards the DR (call it gamma_DR) to be 1/(LSSP S11), then I should get oscillation?

Previously I use the small-sig S but i see no relation between gamma_DR and S11..... so i have some problem explaining the theory....