Hi. my project was to make an fpv setup that sends out an ntsc signal through 5.8ghz bandwidth. i was wondering if i could use a high speed comparator to create a 5.8ghz fm signal. how i intend to do this is by applying a 5.8ghz triangle wave to the non inverting input of the comparator, and then the approx20mhz ntsc signal to the inverting input to change the am ntsc video signal into fm. i thought of this concept when i was looking at how a class d amp works. will it work? is there even a comparator/opamp that even switches as fast as 5.8ghz? can it transmit the signal through an antenna?

ive been looking on the internet for quites some time now and i cant quite seem to be able to wrap my head around the other methods of modulation out there. many suggested using a phase controlled loop, by tricking the vco to oscilate faster then the input signal to increase the frequency to something tht can be transmittted, however this requires a signal divider. for my application a 20mhz signal the divider would have to have a factor of 290. i have no clue in the slightest on how i would achieve that. any help would be great . also if you have a more legitamate way i can construct a circuit for my application that would be great too. Thanks in advance.
ps. my punctuation is terrible because i am used to microsoft words autopunctuation and auto capitalisation and never learnt how to type properly cuz im a moron

 

Welcome to the moron club, most of us are

Yes there are Ghz comparators -

https://www.analog.com/media/en/technical-documentation/data-sheets/hmc675lc3c.pdf

They have other parts as well.

As far as the scheme, beyond my pay grade.


Regards, Dana.

 

thanks dana appreciate it. im still wondering how pll can be used to make an intermittent frequency