How to model the large signal model of a VCO

[ahmad_abdulghany]

matlab vco function block

How can I model the large signal model of a VCO using either Matlab or ADS?

What I know about it that it gives sinusoidal output voltage signal of frequency depenant on the input voltage as well as the conversion gain (Kv)...

I can express this as:

Vout=Sin wave signal with frequency: (2*pi*int(fc+Kv*Vin,0,t))
where int(F(x),x1,x2) means integration of the function F(x) from x1 to x2, and Kv is the VCO conversion gain, fc is the free running frequency..

and 't' .... I don't know what value should it take to have right expression

Can anyone helps please,
Thanks in advance,
Ahmad,

 

[niklas.zhu]

sorry, i couldn't answer your question about 't'
however, in MATLAB the easiest way is to use simulink to build VCO
you only need constant block, trigonometric function block and integration block

Regards

 

[eng_islam]

there is a ready to use vco block in simulink i think this block is only found in the new versions of matlab

 

[ahmad_abdulghany]

I found VCO block in Simulink in Matlab 7, but i didn't like it,

it's included in the communications toolbox