Scicos Diagram
fr - eng

Integrated diagram of an integer-N frequency synthesizer

Module

• Modnum

Contents

• Integrated diagram of an integer-N frequency synthesizer
  • Module
  • Context
  • Scope Results
  • Used blocks
  • See Also
  • Authors

Context

F_cpf = 20e6;
T_cpf = 1/F_cpf;
sig_ref=(2*%pi*0.2/100)

Fo = 2.045e9;
To = 1 / Fo;
wo=2*%pi * Fo;
kv = 100.5e6;
alpha=6.91e9;
beta2=0.15;
j_vco=1e6;

Fd=2.5e9;
N=int(Fd/F_cpf)

Nsampl = 2;
Tsampl = T_cpf/(Nsampl);
Fsampl = 1 / Tsampl;

Icp = 5e-3;
Ileak=1e-6;
Ileak_sig=1e-12;
fn=F_cpf/180;
phi=%pi/4;

Tfin=0.8e3*T_cpf

Scope Results

Figure : Time domain waveforms : (a)Charge pump output current; (b)VCO input voltage

Figure : Non linear voltage/frequency characteristic of VCO

Figure : Open-loop transfert function

Figure : Closed-loop transfert function

Figure : FM-response transfert function

Used blocks

• NOISEBLK_f - Gaussian White Noise Generator block
• PCLOCK_f - Integrated phase modulator event generator block
• PFD_f - Phase/Frequency tristate Detector block
• SOLOOPFILTER_f - Second order Loop Filter for PLL type 2 block
• VCO_c - Discrete Voltage Controlled Oscillator block

See Also

• synthe_eclat - Scattered diagram of a third order integer-N frequency synthesizer (Scicos Diagram)
• synthe_scicos - Simple scicos diagram of an integer-N frequency synthesizer (Scicos Diagram)
• synthe_interp - Scattered diagram of a third order integer-N frequency synthesizer with an interpolated nonlinearity of VCO and with dual-modulus feedback divider (Scicos Diagram)
• synthe_sd_quick - Modulated fractional frequency synthesizer (Scicos Diagram)

Authors

A. Layec