Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2005-03-22
2005-03-22
Mullen, Thomas (Department: 2632)
Communications: electrical
Selective
Interrogation response
C340S572100, C342S051000
Reexamination Certificate
active
06870461
ABSTRACT:
A receiving/backscattering arrangement for carrying out a contactless data transmission includes an integrated circuit having two antenna contacts, a series arrangement of three high quality capacitances connected between the two antenna contacts, whereby the middle capacitance is an MOS varactor, a controllable variable voltage source connected across the MOS varactor, and a control unit that controls the voltage source. The receiving/backscattering arrangement is especially a passive transponder with a rectifier connected between the antenna contacts, or a semi-passive transponder including a battery or solar cell, to provide the required supply voltage for the circuit. The arrangement achieves a large communication range, for receiving and modulating an interrogation signal, and backscattering the modulated response signal with a high efficiency and low losses. The integrated circuit structure is compact and economical.
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Fischer Martin
Friedrich Ulrich
Karthaus Udo
Ziebertz Dirk
ATMEL Germany GmbH
Fasse W. F.
Fasse W. G.
Mullen Thomas
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