Scicos Diagram
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Scattered diagram of a third order integer-N frequency synthesizer with an interpolated nonlinearity of VCO and with dual-modulus feedback divider

Module

• Modnum

Contents

• Scattered diagram of a third order integer-N frequency synthesizer with an interpolated nonlinearity of VCO and with dual-modulus feedback divider
  • Module
  • Context
  • Scope Results
  • Used blocks
  • See Also
  • Authors

Context

F_ref=250e6
T_ref=1/F_ref
sig_ref=0.02*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(MODNUMCOS+'/examples/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

Scope Results

Figure : (a)Charge pump output current; (b)VCO input voltage.

Used blocks

• CPF_f - Tri-state Phase/Frequency Comparator block
• NOISEBLK_f - Gaussian White Noise Generator block
• PEVTDLY_f - Phase modulator event generator block
• SOLOOPFILTER_f - Second order Loop Filter for PLL type 2 block
• VCOEVT_f - Discrete zero crossing block

See Also

• synthe_scicos - Simple scicos diagram of an integer-N frequency synthesizer (Scicos Diagram)
• synthe_eclat - Scattered diagram of a third order integer-N frequency synthesizer (Scicos Diagram)
• synthe_int - Integrated diagram of an integer-N frequency synthesizer (Scicos Diagram)
• synthe_sd_quick - Modulated fractional frequency synthesizer (Scicos Diagram)

Authors

A. Layec