HOMODYNE RFID RECEIVER AND METHOD

• US 20070247314A1
• Filed: 04/24/2007
• Published: 10/25/2007
• Est. Priority Date: 11/19/2004
• Status: Active Grant

• Current Assignee: Neology Incorporated (OEP Technologie BV)
• Original Assignee: Sirit Technologies, Inc.
• Inventors: Barink, Bernard, d'Hont, Loek
• Granted Patent: US 7,535,360 B2
• Time in Patent Office: Days
• US Class Current: 340/572.200
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: H03D 1/2245 using two quadrature channels H03D1/2209 takes precedence

Abstract

An RFID circuit comprises an RF carrier signal source, a hybrid coupled to the RF carrier signal source operable to generate an in-phase and a quadrature phase component of the RF carrier signal, a switch coupled to the hybrid operable to pass one of the in-phase and quadrature phase components of the RF carrier signal to its output, and a mixer coupled to the output of the switch operable to multiply one of the in-phase and quadrature phase component of the carrier signal and a received modulated carrier signal and generate a baseband signal.

Claims

1. An RFID circuit, comprising:

an RF carrier signal source;

a hybrid coupled to the RF carrier signal source operable to generate an in-phase and a quadrature phase component of the RF carrier signal;

a switch coupled to the hybrid operable to pass one of the in-phase and quadrature phase components of the RF carrier signal to its output; and

a mixer coupled to the output of the switch operable to multiply one of the in-phase and quadrature phase component of the carrier signal and a received modulated carrier signal and generate a baseband signal.

2. The RFID circuit of claim 1, further comprising:

an information signal source;

a transmitter receiving the RF carrier signal and the information signal and operable to modulate the RF carrier signal according to the information signal; and

an antenna transmitting the modulated RF carrier signal.