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Generating the waveform as in the image

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khan_Ali

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HOw to generate the 27MHZ sine signal and switch it as shown in the image. Capture.JPG
 

1) buy a signal generator with burst function.
2) use a dds chip
3) use an fpga with a DAC and create your own dds.
4) use a 3KHz oscillator and a fet switch to gate a 27MHz oscillator.
5) etc., etc.
 

your drawing shows the 27 MHz blast starting at 0 and falling
and ending at 0 and falling
how important is that?

a 2 ms burst is 54240 cycles of 27.12 MHz
how important is that?

what is the peak voltage of your sin wave?
is the signal +/- relative to ground, or is the low (trough) side ground?
 

Use the FY6600 generator and connect the first source to the second generator, first square wave with 2 Hz period, 50 % duty cycle, and the second on/off modulated and carrierfrequency of 27 MHz
 

Hi,

first square wave with 2 Hz period, 50 % duty cycle,
Why 50%?
I'd rather expect 0.4%.

Klaus
 

1) buy a signal generator with burst function.
2) use a dds chip
3) use an fpga with a DAC and create your own dds.
4) use a 3KHz oscillator and a fet switch to gate a 27MHz oscillator.
5) etc., etc.

Yes bro i am trying the third option i am using 27MHZ crystal oscillator which is giving a sine wave having a frequency of 27 MHZ but dont know how to switch the signal on and offf??
 

Hi,

dont know how to switch the signal on and offf??
Just go the usual way: use a switch.

There are "analog switches" that can be controlled with logic levels signals from an FPGA.

Klaus
 

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