how to generate a high frequency?

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lau er kheng

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can anyone tell me how to generate a high frequency from the range 1MHz until minimun of 1GHZ by using the signal genrator or function generator???
if possible,can show me the schematic or the circuit diagram??
 

Hi use the AD9850 DDS chip from analog it can work up to 100M and the multiply it using PLL

Look at www.analog.com for DDS there are some app note also search google for AD9850 you will find many circuit describe how to use it



regards

bobi
 

One of the possibilities is to make 1GHz to 2GHz VCO and fixed oscillator at 1GHz. Mix both signals and filter the resulting signal. You wil get 0 to 1GHz signal generator.
Second possibility is to build number of VCO's to cover entire wanted frequency band.
 

Another option if you do not need specific frequencies is to first generate an octave range of them and then use binary counters to get the lower frequencies.
 

Hi ..what borber suggests is probably the best way to go .. the higher the VCO frequency the wider the frequency interval . Some time ago i used SIRENZA's VCO793-1500T . that does 1G to 2Ghz.Now you just need a 1Ghz oscilator and a mixer .
you could use the same vco and control both with a DAC and a processor
the output frequency of the mixer amplified and filtered could then be fed to a prescaler and the frequency mesured to adjust the control DACS
Ahhh. i just got a new computer and i can't find the part number for the mixer .. well take a look at SIRENSA's web site .. THEY HAVE IT ALL

**broken link removed**

see here for mixers :
**broken link removed**
 

Re: DDS?

can i know wat's the purpose for the DDS??will it generate a frequency? and anyone who got the schematic diagram for the very high frequency signal generator?(from 1MHz until 1GHz)!
and can i use which type of VCO and the oscillator to generate such high frequency?
 

Below 100MHz range it can be a simple circuit, that is true.

lau er kheng I do not think you can make an "as easy" circuit for an oscillator for the range 100MHz to 1GHz.

There are issues (which can be yours too) to consider, it is not easy!

You need a particular RF transistor first of all. RF-- BJT, FET, MESFET, MOSFET etc. are particular for this purpose.

Where are you leading, how do you want it? In what range loss,gains etc???

Please state your problem much clear.

djalli
 

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