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Rf pulse modulator for 4Ghz microwave

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micktosin

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Hi! I need to modulate a 4Ghz carrier signal with a 50Mhz modulating signal. The 555 timer does not seem to be running at 50Mhz. Please could you recomend a Square wave generator that is capable of generating a 50 Mhz pulse signal whilst also producing enough power to switch the transistor, of the circuit shown below, On and Off.

Untitled.jpg
Thanks for your help :D
 

Hello Dear micktosin
It is simple .
You can find not or nand gates at HC or HCT families . ( they can work at frequencies up to 75MHZ) . thus you can design a relaxation oscillator with a resistor and capacitor .
By the way , how did you generate the 4GHZ frequency ?
Good luck
Goldsmith
 
goldsmith said:
Hello Dear micktosin
It is simple .
You can find not or nand gates at HC or HCT families . ( they can work at frequencies up to 75MHZ) . thus you can design a relaxation oscillator with a resistor and capacitor .
By the way , how did you generate the 4GHZ frequency ?
Good luck
Goldsmith
Click to expand...

I guess you have no idea about what you want to do. There is no real "50 MHz modulator" for 4 GHz RF signal. You can, however, use a microwave mixer in which either the 4 GHz or the 50 MHz signal are stronger (a mixer typically needs +10 dBm of LO pump), then the output from such mixer will be "AM modulated" 4 GHz carrier with +/- 50 MHz sidebands.

But first please study a good RF textbook to learn some basics.
 

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