Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2006-12-19
2006-12-19
Zimmerman, Brian (Department: 2612)
Communications: electrical
Selective
Interrogation response
C340S010200, C340S003510, C340S010400, C340S505000, C340S572200, C340S572400, C340S572500, C340S870030, C340S870030, C340S010510, C340S010500, C340S010300
Reexamination Certificate
active
07151436
ABSTRACT:
For transmitting data, a receiving/backscattering arrangement receives, modulates and reflects or backscatters electromagnetic waves emitted by a base station. The modulation corresponds to the data to be transmitted and is carried out selectively using first and/or second different modulation methods depending on the received field strength of the received electromagnetic waves. Preferably, phase shift keying is used especially or at least at low field strengths at far range, while amplitude shift keying is used additionally or alternatively for high field strengths at close range. The two modulation methods can be superimposed. A circuit arrangement includes two different modulator arrangements to perform the two modulation methods depending on the received field strength. The second modulator arrangement preferably comprises a multi-stage voltage multiplier circuit with a modulated switching device intervening in one of the stages to achieve the modulation.
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Fischer Martin
Friedrich Ulrich
ATMEL Germany GmbH
Brown Vernal
Zimmerman Brian
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