I need to generate 25ns width pulses in order to stimulate a RFID SAW tag. I want to know if I can generate these pulses with the ADF4350. Thanks.
Yes, it is possible with the ADF4350.
You can put the output of the R counter to the muxout pin, and then by varying the reference frequency, you can vary the signal from the R counter.
In the attached image, I set the reference frequency to 20 MHz. This gives a 50 ns period, and hence a 25 ns pulse width.
For more imformation on the Muxout settings, see the Muxout and Lock Detect section of the datasheet:
Thank you for your answer.
Alternatively to generate a 25ns Continuous Wave (CW) RF signal which I think you need to stimulate an RFID tag, program the ADF4350 to the correct frequency, e.g. 915MHz and use the PDBRF pin (#26) to turn-on/mute the RF output. If you generate a 25ns pulse from your micro to control this pin you should get a 25ns RF pulse at the ADF4350 output. note 25ns is equivalent to a 40MHz clock period so you could not use a low-end micro for this. Rob's suggestion will generate a train of 25ns 'dc' pulses.
This is a more suitable solution to my system. In fact, I need to generate a 2.4 GHz signal. Thanks a lot.
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