IMPROVED DETECTOR CIRCUIT FOR AN RFID-DEVICE

The present invention relates to a detector circuit (10) being part of an RFID-device, and comprising:- a bias current generator circuit (20) configured to generate an output bias current that is proportional to the square of a temperature-dependent input current,- a first and a second FET-devices,-...

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Bibliographische Detailangaben
Hauptverfasser:	ROTZOLL, Robert R, Buescher, Kevin Scott
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CALCULATING COMPUTING COUNTING DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY HANDLING RECORD CARRIERS PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	The present invention relates to a detector circuit (10) being part of an RFID-device, and comprising:- a bias current generator circuit (20) configured to generate an output bias current that is proportional to the square of a temperature-dependent input current,- a first and a second FET-devices,- at least one of the first and the second FET-devices is biased by means of the output bias current of the bias current generator circuit (20) so that it operates in the sub-threshold region,- an incoming RF-signal is coupled into at least one of the first and the second FET-devices,- a current source (18) for generating a variable threshold current, and- a comparator (19) for determining, on the basis of the variable threshold current and the incoming RF-signal, whether the value of the incoming RF-signal exceeds a threshold value.