| Citation: |
Liu Zhongqi, Zhang Chun, Li Yongming, Wang Zhihua. Low modulation index RF signal detection for a passive UHF RFID transponder[J]. Journal of Semiconductors, 2009, 30(9): 095005. doi: 10.1088/1674-4926/30/9/095005
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Liu Z Q, Zhang C, Li Y M, Wang Z H. Low modulation index RF signal detection for a passive UHF RFID transponder[J]. J. Semicond., 2009, 30(9): 095005. doi: 10.1088/1674-4926/30/9/095005.
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Low modulation index RF signal detection for a passive UHF RFID transponder
DOI: 10.1088/1674-4926/30/9/095005
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Abstract
In a typical RFID system the reader transmits modulated RF power to provide both data and energy for the passive transponder. Low modulation index RF energy is preferable for an adequate tag power supply and increase in communication range but gives rise to difficulties for near-field conventional demodulation. Therefore, a novel ASK demodulator for minimum 20% modulation index RF signal detection over a range of 23 dB is presented. Thanks to the proposed innovative divisional linear conversion from the power into voltage signal, the detection sensitivity is ensured over a wide power range with low power consumption of 8.6 μW. The chip is implemented in UMC 0.18 μm mix-mode CMOS technology, and the chip area is 0.06 mm2.-
Keywords:
- RFID
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References
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Proportional views
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