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Hafedh
Joined: 15 Feb 2008
Posts: 112
Helped: 46
Location: Sfax, Tunisia
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 04 May 2008 12:21 ASK modulator for 13.56 MHz RFID tag |
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Hi friends
can any one plz tell me how to simulate, the ASK modulator circuit used in the 13.56 MHz RFID TAG
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FvM
Joined: 22 Jan 2008
Posts: 5160
Helped: 767
Location: Bochum, Germany
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04 May 2008 12:37 Re: ASK modulator for 13.56 MHz RFID tag |
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| Don't understand, what's your particular simulation problem?
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04 May 2008 12:37 Ads |
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sohailkhanonline
Joined: 08 Oct 2007
Posts: 33
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14 May 2008 4:51 Re: ASK modulator for 13.56 MHz RFID tag |
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please mention which rfid standard are you using if it is s50 then i may help...
if it is simulation give more detail about the circuit and your question
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Slayerza
Joined: 22 Oct 2005
Posts: 321
Helped: 22
Location: South Africa
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25 May 2008 20:20 Re: ASK modulator for 13.56 MHz RFID tag |
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Since tags at 13.5MHz are considered to be LF and as such mainly inductive. Supply a sinusoidal signal to the input labeled Ub (upper left). This will couple some energy to the tag (right hand side of the image, after the inductor).
To perform ASK the IC in the tag changes the impedance 'seen' by the signal from the interrogator. As such by switching the transistor at the bottom right the signal cannot be coupled as efficiently as such producing a variation in amplitude.
Hope this helps,
Cheers
Slayer
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