Problem with VCO output (as there is no buffer)

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mohamedabouzied

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i have a VCO working at 2.4 GHz
i should match its output for maximum power transfer
i measured its output impedence, and i put a matching load Zload = Zout*
but when i did that, no output from VCO and the oscillation is dead.

why does this happened?


mohamedabouzied
 

Re: about vco output??

I think you have to match the VCO after buffer with capacitive input. Because the load has big influence on VCO feedback as consequence on VCO oscillation.
 
Re: about vco output??

u mean to use a buffer between the VCO and and outer world?
that buffer is an RF buffer so, it is hard to implement.
also, should i match between the VCO and the buffer?

do u have a good paper or toturial to implement this buffer?


and does that buffer have an inductor?
another bad thing???????


thanx for replay

mohamedabouzied
 

Re: about vco output??

but there is 2 coils
is that ok?
i mean a coil is a big block, is there a way to overcome or replace it?


thanx alot for your replay
mohamedavouzied
 

Re: about vco output??

It depends on your specification... If you have enough area - use inductors, if not - use resistors. Try both to find best suited...
 
about vco output??

the buffer can be done , without coils , it can be comon source amplifer , or common drain , then u can make this drive , the output world

never match the Zof the VCO . alos the Z of the VCO change , coz the VCO is hard nonlinear circuit

khouly
 
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