Method and apparatus for an enhanced RFID tag interrogator

Details Method and apparatus for an enhanced RFID tag interrogator Method and apparatus for an enhanced RFID tag interrogator

2004-05-21

2010-06-08

Nguyen, Tony T (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S041100, C455S090200, C455S550100, C342S042000, C342S051000

Reexamination Certificate

active

07734270

ABSTRACT:
An apparatus for an enhanced receiver for an RFID Tag Interrogator is described. The enhanced receiver has a zero crossing detector, a phase shifter, a pulse generator and a chopper. The zero crossing detector produces a sampling signal from the current transformer. The phase shifter modifies the sampling signal by producing a 90 degree phase shifted sampling signal. The pulse generator increases time duration of each pulse of the phase shifted sampling signal, which is then fed to the chopper. Thus, the chopper samples the backscattered carrier signal every 90 degree phase shift from the time when the backscattered carrier signal passes the zero crossing. This makes isolation of the backscattered signal from the carrier signal more effective.

REFERENCES:
patent: 6211799 (2001-04-01), Post et al.
patent: 6282407 (2001-08-01), Vega et al.
patent: 6353406 (2002-03-01), Lanzl et al.
patent: 6946989 (2005-09-01), Vavik

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