2.4 GHz pulsing oscillator

Hi engineers

I need to design af pulsing oscilator to be used for some testing.

It must be able to turn on/off a raw carrier wave of 2.4 Ghz in random intervals of about 2 ms, and it must be possible to adjust the amplitude of the carrier wave.

My idear was to solve it by an oscillator, a PA (power amplifier), and a switch.

The switch is controlled by a little microcontroller, and guides the wave either into the antenna (on) or into a load resistor (off)

I believe Analog Devices has most of the components that I need.

Any one who can recomend some devices for me?

I am open for other brands as well offcause

br.

Allan

YT2095 over 13 years ago

have you looked into SSB mode transmission?
it would be a lot easier than physically switching between PA and dummy load

just a thought.
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alkrojen over 13 years ago in reply to YT2095

No I have never heard about SSB mode transmission.
How do you think it could be used in my application?

I am open for alternativ sugestions

br.
Allan
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YT2095 over 13 years ago in reply to alkrojen

simply put SSB (Single Side Band) is Half an AM transmission, with the carrier stripped off.
typically the PA stage is left switched on, they don`t like being turned on/off too quickly, so you alter what you put Into the PA instead.
if you have your carrier gated through an OP Amp, where One input is your modulation (the Rate and Amplitude you want your Carrier (2.4GHz) gated at), and the other input being a straight 2.4G, the Output should then be 2,4G proportionally modulated in exactly the way you want

hope that helps a little.
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alkrojen over 13 years ago in reply to YT2095

Thanks for the sugestion.
In my ears SSB sounds more complicated than switching a constant oscillator. But again I am not an RF expert so maybe you are right.
I will investigate further...

br.
Allan
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YT2095 over 13 years ago in reply to alkrojen

Switching the main Osc in and out from the PA stage is fine too if that`s all you want it`s CW Mode, but you did state "and it must be possible to adjust the amplitude of the carrier wave." in your original post.
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alkrojen over 13 years ago in reply to YT2095

My idear was to use a VGA instead of a switch. It can both do the switching and adjust the amplitude.
I hope it will work
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