Scicos Diagram
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Continous Voltage Controled Oscillator

\epsfig{file=scicos_vco_cos.eps,height=9cm}

Description

This diagram realizes an open loop model of a continous Voltage Controled Oscillator.
Regular output of the VCO is described with the following formula :

$\displaystyle y_{s}\left(t\right)=\cos \left[\left(\omega_{0}t\right)+\int^{t}_{0} k_{v} u_{3}\left(\tau\right)d\tau\right]
$

Integration of input voltage and detection of crossing are made with the integral block and zeros crossing block of scicos which use the integrated lsoda solver.

Context


Fo = 10e6;
To = 1 / Fo;
wo=2*%pi * Fo;
alpha=60e6;
kv=60e6
j_vco=100e6;
N=3;
Nsampl = 80;
Tsampl = To/(Nsampl);
Fsampl = 1 / Tsampl;
Tfin=15*To

Scope Results

\begin{figure}\begin{center}
\epsfig{file=scicos_vco_scope_1.eps,width=300.00pt}
\end{center}\end{figure}
Figure : Input and output voltage of VCO
\begin{figure}\begin{center}
\epsfig{file=scicos_vco_scope_2.eps,width=300.00pt}
\end{center}\end{figure}
Figure : Events generated by the - to + block
\begin{figure}\begin{center}
\epsfig{file=scicos_vco_scope_3.eps,width=300.00pt}
\end{center}\end{figure}
Figure : Events generated by the frequency divider block

See Also

Authors

IRCOM Group Alan Layec