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A question about how to make a Oscillator of 1GHZ,PLS HELP~~

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ZengLei

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HELLO,i'm a beginner in RF area,i have a project to make a Oscillator at 1GHZ,

and i design a plan:a oscillator at 315MHZ+pll+vco,and then PLL+VCO makes the 315MHZ up to 945MHZ can it works??

any other idears???? thanks~~~~~

and waht i should note in layout the PCB,??

THANKS~~~~~~~~~~~~
 

Re: A question about how to make a Oscillator of 1GHZ,PLS HE

before the PCB u need to know ,how to design each circuit , and then go to the layout
ur VCO range is very high

u need alot of work

Khouly
 

Re: A question about how to make a Oscillator of 1GHZ,PLS HE

How about a crystal oscillator @ 13 MHz, so you can use a cheap GSM reference crystal, then a VCO @ 945 MHz, and a PLL. Pick the divide ratio's to give you the right channel spacing.

An excellent PLL reference is here

webench.national.com/appinfo/wireless/pll_designbook.html

and you can use National Semiconductor's Easy PLL part selector at

webench.national.com/appinfo/webench/EasyPLL/easypll.cgi?flow=wireless&step=1A

For a 900 MHz VCO, I'd be tempted to look at a packaged VCO module to make this easier.

Dave
www.keystoneradio.com
 

    Z

    ZengLei

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Re: A question about how to make a Oscillator of 1GHZ,PLS HE

If I were a student and wanted to get the most bang out of project like that, I would make:

1) A 315 MHz PLL
2) A X3 frequency multiplier to get up to 945 MHz
3) An output bandpass filter and amplifier to clean the desired output up.

You could just use a 1 gbit type digital gate to do the X3, as the square wave output would be rich in 3rd harmonics. Something like a 74LVC1G17DBVR gate.
Alternatively you could make a diode or fet frequency multiplier.

Such a project would look great on your resume. You would have experience to talk about in using VCOs, designing PLLs, Filters, Amplifiers, and frequency multipliers.
 

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    ZengLei

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