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matching network problem in cadence virtuoso

robert 21

Hello, i have built a matching network of 13dB gain and  NF as shown bellow step by step.(including all the plots and matlab )

its just not working at all,i am doing it exacly by the thoery

taking a point inside the circle-> converting its gamma to Z_source->converting gamma_s into gamma_L with the formulla bellow as shown in the matlab->converting the gamma_L into Z_L-> building the matching network for conjugate of Z_L and Z_c.Its just not working.

where did i got  wrong?

Thanks.

gamma_s=75.8966*exp(deg2rad(280.88)*i);
z_s=gamma2z(gamma_s,50);
s11=0.99875-0.03202*i
s12=721.33*10^(-6)+8.622*10^(-3)*i
s21=-188.37*10^(-3)+30.611*10^(-3)*i
s22=875.51*10^(-3)-100.72*10^(-3)*i
gamma_L=conj((s22+(s12*s21*gamma_s)/(1-s11*gamma_s)))
z_L=gamma2z(gamma_L,50)

Parents
  • robert 21

    Hello,The matching network tottaly ruins the biasing point(which was in saturation before addind the matching networks as show bellow)
    What should i do?
    We could add some biasing VDC source separatly to the port (with a DC BLOCK capacitor) but the added capacitance will distort the matching network.
    So the question comes to what capacitor should i add in series to VDC so it will not distort my matching network?
    or is there some other method?


Reply
  • robert 21

    Hello,The matching network tottaly ruins the biasing point(which was in saturation before addind the matching networks as show bellow)
    What should i do?
    We could add some biasing VDC source separatly to the port (with a DC BLOCK capacitor) but the added capacitance will distort the matching network.
    So the question comes to what capacitor should i add in series to VDC so it will not distort my matching network?
    or is there some other method?


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