Author Topic: RFID tag transmitter  (Read 85 times)

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Offline nForce

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RFID tag transmitter
« on: December 08, 2017, 03:09:21 AM »
Hello,

I know how the chip (which contains the information gets power). By radiowaves which by Faraday's law induces a voltage in a coil(receiveng antenna). But I don't understand how it transmittes data to the RFID reader.  I never designed those chips, but I can think that the chip is a register (ROM) which contains 0 and 1. Something like in a computer. So how to transmit such data? I have read about it on the web, but it's not described for the transmitter.

So from my understanding we can transmit only harmonic signals, but if we have a DC value of voltage, can we transmit DC signals?

Thank you.
 

Offline Mickster

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  • Country: bm
Re: RFID tag transmitter
« Reply #1 on: December 08, 2017, 03:58:35 AM »
To be brief, the device shorts it's antenna to create the data bits. This link explains a lot better than I can.
http://www.rfwireless-world.com/Terminology/ASK-vs-FSK-vs-PSK.html
 


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