System and method for providing a low power low voltage data...

Details System and method for providing a low power low voltage data... System and method for providing a low power low voltage data...

2005-01-27

2009-08-25

Pascal, Robert (Department: 2817)

Demodulators

Amplitude modulation demodulator

Input signal split into plural signals

C329S349000

Reexamination Certificate

active

07579906

ABSTRACT:
A system and method is disclosed for demodulating RF amplitude modulated signals in a demodulator circuit of an EPC0 compliant RFID tag. One advantageous embodiment of the invention comprises first and second input ports, a +ve envelope detector circuit for each of the first and second input ports, a −ve envelope detector circuit for each of the first and second input ports, a +ve envelope differentiator circuit, a +ve low pass filter, a −ve envelope differentiator circuit, a −ve low pass filter, and a zero crossing detector. The zero crossing detector detects a transition in the RF input signal using a voltage difference between a +ve filtered differentiated envelope signal and a −ve filtered differentiated envelope signal.

REFERENCES:
patent: 3988679 (1976-10-01), Clarke et al.
patent: 5260974 (1993-11-01), Johnson et al.
patent: 6426716 (2002-07-01), McEwan
patent: 6828853 (2004-12-01), Rizzo

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