Hello,

i want to model Gain Compression of a mixer caused by insufficient LO-Power with the table_model function. Here is my script and the table file:

             V(in)  <+ 50*I(in);                                                                                   //50Ohms input
           Power_LO_Vsquared = pow(V(LO),2)/50;                                                   //determining LO-Power
           Power_LO_dBm = abs(10*log(1e-30+Power_LO_Vsquared/1e-3));              //conversion to dBm
           Gain_tbl_dB = $table_model(Power_LO_dBm, "mixer_gain_temp2.tbl","");   //loading Gain from file
           Gain_tbl_V = pow(10,Gain_tbl_dB/20);                                                     //conversion of Gain
           V(out) <+ Gain_tbl_V*V(in);                                                                    //weighting Input with Gain

#mixer_gain_temp2.tbl
#
#LO-Power(dBm)              Gain(dB)
0                        2.6
1                        3.6
2                        6
3                        5.6
4                        6.6
5                        7.6
6                        8.4
7                        9.2

The script reads out the correct Gain but unfortunately there must be a problem in mulitplying the Gain with the input voltage.
Can anyone help me?

Thanks!

Thanks for your reply, Ken. Is there a way to extract the peakvalue of the voltage as a variable of type real?

Bessi

Rectify and filter.

-Ken