High dynamic range ASK demodulator for use in an RFID...

Details High dynamic range ASK demodulator for use in an RFID... High dynamic range ASK demodulator for use in an RFID...

2008-07-30

2010-12-21

Mis, David (Department: 2817)

Demodulators

Pulse or interrupted continuous wave demodulator

C375S353000

Reexamination Certificate

active

07855595

ABSTRACT:
An ASK demodulator for use in an RFID transponder having a limiter circuit associated with the antenna circuit and converting the ASK antenna field strength modulation into an ASK limiter current modulation by limiting the antenna voltage to a fixed value and thereby causing the limiter current to be substantially proportional to the ASK antenna field strength, and a current discriminator circuit that discriminates the ASK limiter current modulation. By converting the field strength modulation into a proportional limiter current and discriminating that limiter current, a linear relationship and a stable demodulator sensitivity are achieved. The current discrimination can be made accurately under low-voltage conditions.

REFERENCES:
patent: 6089453 (2000-07-01), Kayser et al.
patent: 2007/0127560 (2007-06-01), Kang et al.
patent: 2008/0224766 (2008-09-01), Yamazaki et al.
patent: 69601588 (1999-10-01), None
patent: 2153827 (2008-11-01), None
Hiroyuki Nakamoto et al, “A Passive UHF RI Identification CMOS Tag IC Using Ferroelectric RAM in 0.35-um Technology”, Jan. 1, 2007, pp. 101-110, vol. 42. No. 1, IEEE Journal of Solid-State Circuits.

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