Scattered diagram of a third order integer-N frequency synthesizer with an interpoled non-linearity of VCO and with dual-modulus feedback divider
F_ref=250e6
T_ref=1/F_ref
sig_ref=0.2*T_ref
R=5
F_cpf = F_ref/R;
T_cpf = 1/F_cpf;
Io=5e-3
Ileak=1e-8
Fo = 2.045e9;
To = 1 / Fo;
wo=2*%pi * Fo;
j_vco=2e6;
y_tab=read(MODNUM+'/scs_diagr/pll/synthe/vcotab',12,9);
d_tab=splin(y_tab(:,1),((y_tab(:,2)*1e6)-Fo)*2*%pi)
i_tab=1:0.1:12;
f_tab=interp(i_tab,y_tab(:,1),((y_tab(:,2)*1e6)-Fo)*2*%pi,d_tab);
A=4;
B=6;
P=8;
N=B*P+A;
Fd=N*F_cpf;;
fn=F_cpf/180
mphi=%pi/4
kv=80e6
Nsampl = 2;
Tsampl = 1/(Nsampl*Fd);
Fsampl = 1 / Tsampl;
Tfin=0.9e3*T_cpf
Figure : Scope results
IRCOM Group
Alan Layec