Demodulator for contactless chip card

Details Demodulator for contactless chip card Demodulator for contactless chip card

1998-09-18

2000-02-29

Grimm, Seigfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329366, 329370, 235380, 235439, H03D 110

Patent

active

060314192

ABSTRACT:
A contactless chip card, receiving binary data transmitted by radio frequency, includes a demodulator for the binary data. The demodulator includes a circuit for the detection of the transmitted signals, a rectifier circuit, a bandpass filter, two comparators and a memory circuit. The bandpass filter provides a low-frequency signal used as a reference for the two comparators and a high-frequency signal that is compared with the references varying with the low frequency signal. As a result, the demodulation is independent of the mean level of the received signal.

REFERENCES:
patent: 4782308 (1988-11-01), Trobec et al.
patent: 4924171 (1990-05-01), Baba et al.
Patent Abstracts of Japan, vol. 006, No. 037, Mar. 6, 1982 and JP 56 154858 A, Nov. 30, 1981.
Patent Abstracts of Japan, vol. 017, No. 505, Sep. 10, 1993 and JP 05 128319 A, May 25, 1993.
R.W. Uhlhorn et al., "Evolution of a 100 Mbps Fiber Optic Serial Data Bus for Aereospace Applications," Proceedings of the IEEE 1984 National Aerospace and Electronics Conference, May 1984, vol. 1, pp. 127-134.

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