How to design a small RF oscillator ?

[chai]

anyone can help me???

I am designing the small rf oscillator which output should be 220Mhz, gain = - 45 dbm, 3.65mvpp. anyone can help me how to design it.. where can i find the oscillator design schematic and calculation..

 

[the_risk_master]

Re: anyone can help me???

Hi Chai,

You can use class C transistor amplifier design (tha basics) with an LC tank circuit to the collector or may be a crystal.

Where you can find the design and calculations?
A: at the back of our mind...


Well it solely depends on how will you contruct it because there are lots of oscillator circuits, may be you can also use the ICL8038 or LM555 for some reasons and use your basic skills in analysing RLC circuits


Thats all I can do for you...

 

[E-design]

Re: anyone can help me???

Well it solely depends on how will you contruct it because there are lots of oscillator circuits, may be you can also use the ICL8038 or LM555 for some reasons and use your basic skills in analysing RLC circuits

Thats all I can do for you...

220MHz & ICL8038/LM555 ?? You will get 100kHz if you are lucky

Look at Odyseus's page for some good examples
**broken link removed**

Below is a typical design I did using the same basic design equations. Included is a plot of the expected output spectrum of this oscillator. Note that I have added a buffer stage.

 

[alard]

Re: anyone can help me???

I want to design a VCO of 5.8GHz using NE3210S01, is it possible to use the same method?

 

[E-design]

Re: anyone can help me???

At this high frequencies you will be better off using a ceramic loaded coaxial or DRO design.

**broken link removed**

 

[kayaoo]

anyone can help me???

Hi Chai,
I don't know what your osicillator will be used for and what is its requipment. But if you just want an stable, fix and small ( -45dBm) signal, you can easily get it by amplifying the signal of a 55Mhz XO and filtering out the 4* frequncy.
Kayaoo