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How can I build a 90MHz VCO (or even fixed freq Osc.)?Help!

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ahmad_abdulghany

ahmad_abdulghany

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vco 90 mhz

I want to build a discretec (i.e. not integrated) VCO that's to be stable and have center frequency of 90MHz..

Can anyone suggest good and stable circuit to make that VCO I prefer using crystal.. but notice that i am not able to get crystal with frequency more than 30MHz... I may use it as an over tone xtal .. but how? also how to simulate it with A.D.S.

I hope that anyone help.
Thanks in advance,
Ahmad,
 

Re: How can I build a 90MHz VCO (or even fixed freq Osc.)?He

throwaway18 said:
How much frequency variation do you need?
Click to expand...

I hope to vary it in as wide as possible (I don't know how far can it be dynamically change)..
 

Re: How can I build a 90MHz VCO (or even fixed freq Osc.)?He

Crystal oscillator is stable but it's frequency can be changed only few kHz.
LC oscillator is less stable but it's frequency can be changed up to 1:3.
 

Re: How can I build a 90MHz VCO (or even fixed freq Osc.)?He

Borber said:
Crystal oscillator is stable but it's frequency can be changed only few kHz.
LC oscillator is less stable but it's frequency can be changed up to 1:3.
Click to expand...

Okay, I agree with you, but i need circuits now, suggest if available two circuits one with LC and one with xtal..

Thanks,
Ahamd,
 

Re: How can I build a 90MHz VCO (or even fixed freq Osc.)?He

**broken link removed**

check this link it is very helpful

wish this help u

khouly
 
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