2007 | OriginalPaper | Buchkapitel
Backscattering architecture and choice of modulation type
Erschienen in: Design and Optimization of Passive UHF RFID Systems
Verlag: Springer US
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The input impedance of an RF transponder is mainly influenced by the rectifier. As seen in chapter 3, it is possible to compute the impedance coming from the rectifier. To enable the communication from the tag to the reader there are two backscattering modulation choices: Amplitude Shift Keying (ASK) and Phase Shift Keying (PSK). A thorough comparison of these two modulation types in the light of the backscattering issue is presented in this chapter.